Fix #493 -- Fix Python 3.5 compatibility

Ref 1954bf57fa
Switch Chrome Driver to package
2018-08-05 11:53:10 +02:00 · 2018-07-27 16:22:17 +02:00 · 2018-07-24 13:05:11 +02:00 · 2018-07-24 13:05:11 +02:00 · 2018-07-01 10:37:30 +02:00 · 2018-06-30 14:58:47 +02:00
44 changed files with 1526 additions and 3790 deletions
@@ -0,0 +1,2 @@
+[bandit]
+exclude: tests
@@ -1,6 +1,3 @@
-
-testapp/tt.py
-
 *.pyc

 Django_Select2.egg-info
@@ -19,3 +16,7 @@ docs/_build
 env/
 venv/
 .cache/
+.tox/
+geckodriver.log
+ghostdriver.log
+.coverage
@@ -1,38 +1,52 @@
 language: python
-sudo: false
 cache:
-  - pip
+- apt
+- pip
 services:
-  - memcached
+- redis
+addons:
+  apt:
+    packages:
+    - chromium-chromedriver
+    - python3-enchant
+    - python-enchant
+    - graphviz
 python:
-  - "2.7"
-  - "3.3"
-  - "3.4"
-  - "pypy"
-  - "pypy3"
+  - "3.6"
 env:
-  global:
-    - DISPLAY=:99.0
  matrix:
-    - DJANGO="Django<1.8,>=1.7"
-    - DJANGO="Django<1.9,>=1.8"
-    - DJANGO="-e git+https://github.com/django/django.git@master#egg=Django"
+  - DJANGO=111
+  - DJANGO=20
+  - DJANGO=master
+  - TOXENV=qa
+  - TOXENV=docs
 matrix:
  fast_finish: true
  allow_failures:
-    - env: DJANGO="-e git+https://github.com/django/django.git@master#egg=Django"
+  - env: DJANGO=master
 install:
-  - pip install --upgrade pip
-  - pip install -r requirements_dev.txt
-  - if [[ $TRAVIS_PYTHON_VERSION == 2* ]] || [[ $TRAVIS_PYTHON_VERSION == pypy ]]; then pip install python-memcached; fi
-  - if [[ $TRAVIS_PYTHON_VERSION == 3* ]] || [[ $TRAVIS_PYTHON_VERSION == pypy3 ]]; then pip install python3-memcached; fi
-  - pip install $DJANGO
-  - pip install coveralls
-  - sh -e /etc/init.d/xvfb start
+- pip install --upgrade pip tox
+- pip install -U codecov
+before_script:
+- ln -s /usr/lib/chromium-browser/chromedriver ~/bin/chromedriver
+- nvm install --lts
+- npm install -g standard
+- |
+  if [[ -z $TOXENV ]]; then
+    export TOXENV=py$(echo $TRAVIS_PYTHON_VERSION | sed -e 's/\.//g')-dj$DJANGO
+  fi
+- echo $TOXENV
 script:
-  - isort --check-only --recursive --diff .
-  - flake8 --jobs=2 .
-  - pep257 django_select2
-  - coverage run --source=django_select2 runtests.py
+- tox -e $TOXENV
+- standard
 after_success:
-  - coveralls
+- codecov
+deploy:
+  provider: pypi
+  user: codingjoe
+  password:
+    secure: fEP9K7y0ZF9fRvQEUN4kgPXQEZvi3Cx3ikUebG2UM/2uhcaUQm0+KpgZ2S+lvOTYcBnNgzPzFsVIZMcVcTxwIKuQDEMq9y2eop2hnisb9KXsIm9qPYSzOnRm74VuiOt4hNOZMe0qVBK2cO3vC9NDXuzdI8A0JynJhthfl4t+kFM=
+  on:
+    tags: true
+    distributions: sdist bdist_wheel
+    repo: applegrew/django-select2
@@ -1,6 +1,87 @@
 Changelog Summary
 =================

+Changes for django-select2 v6.0.1 and later are logged on the [github releases page](https://github.com/applegrew/django-select2/releases).
+
+### v6.0.0
+
+* Add Support for Django 2.0
+* Drop Python 2 support
+* Drop Python 3.5 support
+* Drop Django 1.8 support
+* Drop Django 1.10 support
+
+### v5.10.0
+* Add support for dependent select fields [321](github.com/applegrew/django-select2/pull/321/).
+
+### v5.9.0
+* Add support for Django 1.11 LTS
+* Drop support for Django 1.9
+
+### v5.8.10
+* Fixes tests for Django 1.10+
+* retain order of choices [299](https://github.com/applegrew/django-select2/pull/299)
+
+### v5.8.9
+* Fixes tests.  No functional change from 5.8.8.
+
+### v5.8.8
+* Upgrade Select2 to version 4.0.3
+
+### v5.8.7
+* Fix #285 -- Do not evaluate queryset in `render_options`.
+
+### v5.8.3
+* Remove six dependency -- User django.utils.six instead.
+
+### v5.8.2
+* Fixes #260 -- Fixes bug in render choices
+
+### v5.8.0
+* Changed signature of `render` and `render_choices` to satisfy Django 1.10 changes.
+* Changed widgets' inheritance tree to be more consistent.
+
+### v5.7.1
+* Fixes pickle bug of lazy object
+
+### v5.7.0
+* Security fix that allows a `field_id` to only be used for the intended JSON endpoint.
+  
+      Prior to that change you could use any `field_id` on any select2 JSON endpoint.
+      Even if the id was intended to be used on a private endpoint if could be used on
+      the default one and therefore leak sensitive data.
+      
+* Breaking change on how `Heavy` widgets are being cached.
+      
+      Heavy widgets used to add themselves to the cache. Now they add a dictionary to
+      the cache containing themselves and the target url.
+      
+      ```python
+      {
+          'widget': self,
+          'url': self.get_url(),
+      }
+      ```
+
+### v5.6.0
+* Added `label_from_instance` method for model widgets to define custom option labels.
+
+### v5.5.0
+* Added settings to delivery static assets from different source.
+
+### v5.4.2
+* Fixed initial data not being shown for heavy widgets.
+
+### v5.4.1
+* Fixed memory leak in `ModelSelect2Mixin` and subclasses
+
+### v5.4.0
+* Added `Select2TagWidget` a light widget with tagging support
+
+### v5.3.0
+* Added djangoSelect2 jQuery plugin to support
+  dynamic field initialisation
+
 ### v5.2.0
 * Added pagination

@@ -0,0 +1,13 @@
+Copyright 2017 Johannes Hoppe
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
@@ -1,176 +0,0 @@
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@@ -1,5 +0,0 @@
-include *.txt *.md
-recursive-include django_select2/static *.*
-recursive-exclude django_select2/static .DS_Store
-exclude requirements_dev.txt
-prune tests
@@ -1,100 +0,0 @@
-Django-Select2
-==============
-
-[![PyPi Version](https://img.shields.io/pypi/v/Django-Select2.svg)](https://pypi.python.org/pypi/Django-Select2/)
-[![Build Status](https://travis-ci.org/applegrew/django-select2.svg?branch=master)](https://travis-ci.org/applegrew/django-select2)
-[![Test Coverage](https://coveralls.io/repos/applegrew/django-select2/badge.png?branch=master)](https://coveralls.io/r/applegrew/django-select2)
-[![GitHub license](https://img.shields.io/badge/license-APL2-blue.svg)](https://raw.githubusercontent.com/applegrew/django-select2/master/LICENSE.txt)
-[![Join the chat at https://gitter.im/applegrew/django-select2](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/applegrew/django-select2?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
-
-This is a [Django](https://www.djangoproject.com/) integration of [Select2](http://ivaynberg.github.com/select2/).
-
-The app includes Select2 driven Django Widgets.
-
-## Installation
-
-
-1. Install `django_select2`
-
-        pip install django_select2
-
-2. Add `django_select2` to your `INSTALLED_APPS` in your project settings.
-
-3. Add `django_select` to your urlconf if you use any 'Auto' fields.
-
-        url(r'^select2/', include('django_select2.urls')),
-
-
-### Upgrade from Version 4
-
-Version 5 is a complete rewrite of the package to drastically reduce
-the code base and to ensure a future maintainability.
-
-While we feature set remained unchanged, the API changed completely.
-Major changes:
- Fields have been removed in favor of widgets.
- All version 4 settings have been removed.
- Template tags have been removed.
- 3rd party javascript is served by a CDN.
- No more inline javascript code.
-
-#### Upgrade can be done in 5 simple steps:
-
-1. Remove all existing and to setup the new cache backend.
-2. Remove the old template tags from your templates:
- 1. `import_django_select2_js`
- 2. `import_django_select2_css`
- 3. `import_django_select2_js_css`
-3. Add `form.media.css` to the top and `form.media.js`
- to the bottom of your base template.
-4. Upgrade to jQuery version 2, if you are still running version 1.
-5. Replace old fields with new widgets.
-
-
-## Documentation
-
-
-Documentation available at http://django-select2.readthedocs.org/.
-
-## External Dependencies
-
-
-* jQuery version 2
-    This is not included in the package since it is expected
-    that in most scenarios this would already be available.
-
-
-## Example Application
-
-Please see `tests/testapp` application.
-This application is used to manually test the functionalities of this package.
-This also serves as a good example.
-
-## Special Thanks
-
-
-* Samuel Goldszmidt (@ouhouhsami) for reporting many fundamental issues with the code, because of which versions 2.0 and 2.0.1 were released.
-
-## Official Contributors
-
-* Johannes Hoppe (@codingjoe)
-
-## Changelog
-
-See [CHANGELOG.md](CHANGELOG.md)
-
-## License
-
-Copyright 2012 Nirupam Biswas
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this project except in compliance with the License.
-You may obtain a copy of the License at
-
-[http://www.apache.org/licenses/LICENSE-2.0](http://www.apache.org/licenses/LICENSE-2.0)
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
@@ -0,0 +1,69 @@
+Django-Select2
+==============
+
+|version| |ci| |coverage| |license|
+
+This is a `Django`_ integration of `Select2`_.
+
+The app includes Select2 driven Django Widgets.
+
+.. note::
+    Django's admin comes with builtin support for Select2
+    since version 2.0 via the `autocomplete_fields`_ feature.
+
+Installation
+------------
+
+1. Install ``django_select2``
+
+.. code:: python
+
+    pip install django_select2
+
+2. Add ``django_select2`` to your ``INSTALLED_APPS`` in your project
+   settings.
+
+3. Add ``django_select`` to your urlconf if you use any "Auto" fields.
+
+.. code:: python
+
+    url(r'^select2/', include('django_select2.urls')),
+
+Documentation
+-------------
+
+Documentation available at http://django-select2.readthedocs.io/.
+
+External Dependencies
+---------------------
+
+-  jQuery version 2 This is not included in the package since it is
+   expected that in most scenarios this would already be available.
+
+Example Application
+-------------------
+
+Please see ``tests/testapp`` application. This application is used to
+manually test the functionalities of this package. This also serves as a
+good example.
+
+Changelog
+---------
+
+See `Github releases`_
+
+
+.. _Django: https://www.djangoproject.com/
+.. _Select2: http://ivaynberg.github.com/select2/
+.. _autocomplete_fields: https://docs.djangoproject.com/en/stable/ref/contrib/admin/#django.contrib.admin.ModelAdmin.autocomplete_fields
+.. _CHANGELOG.md: CHANGELOG.md
+.. _Github releases: https://github.com/applegrew/django-select2/releases
+
+.. |version| image:: https://img.shields.io/pypi/v/Django-Select2.svg
+   :target: https://pypi.python.org/pypi/Django-Select2/
+.. |ci| image:: https://travis-ci.org/applegrew/django-select2.svg?branch=master
+   :target: https://travis-ci.org/applegrew/django-select2
+.. |coverage| image:: https://codecov.io/gh/applegrew/django-select2/branch/master/graph/badge.svg
+   :target: https://codecov.io/gh/applegrew/django-select2
+.. |license| image:: https://img.shields.io/badge/license-APL2-blue.svg
+   :target: https://raw.githubusercontent.com/applegrew/django-select2/master/LICENSE.txt
@@ -1,12 +1,10 @@
-# -*- coding: utf-8 -*-
 """
 This is a Django_ integration of Select2_.

-The app includes Select2 driven Django Widgets and Form Fields.
+The application includes Select2 driven Django Widgets and Form Fields.

 .. _Django: https://www.djangoproject.com/
 .. _Select2: http://ivaynberg.github.com/select2/

 """
-
-__version__ = "5.2.0"
+default_app_config = 'django_select2.apps.Select2AppConfig'
@@ -0,0 +1,9 @@
+"""Django application configuration."""
+from django.apps import AppConfig
+
+
+class Select2AppConfig(AppConfig):
+    """Django application configuration."""
+
+    name = 'django_select2'
+    verbose_name = 'Select2'
@@ -1,19 +1,16 @@
-# -*- coding: utf-8 -*-
 """
-Shared memory across multiple machines to the heavy ajax lookups.
+Shared memory across multiple machines to the heavy AJAX lookups.

 Select2 uses django.core.cache_ to share fields across
 multiple threads and even machines.

-Select2 uses the cabhe backend defind in the setting
+Select2 uses the cache backend defined in the setting
 ``SELECT2_CACHE_BACKEND`` [default=``default``].

 It is advised to always setup a separate cache server for Select2.

 .. _django.core.cache: https://docs.djangoproject.com/en/dev/topics/cache/
 """
-from __future__ import absolute_import, unicode_literals
-
 from django.core.cache import caches

 from .conf import settings
@@ -1,7 +1,4 @@
-# -*- coding: utf-8 -*-
 """Settings for Django-Select2."""
-from __future__ import absolute_import, unicode_literals
-
 from appconf import AppConf
 from django.conf import settings  # NOQA

@@ -9,9 +6,11 @@ __all__ = ('settings', 'Select2Conf')


 class Select2Conf(AppConf):
-
    """Settings for Django-Select2."""

+    LIB_VERSION = '4.0.5'
+    """Version of the Select2 library."""
+
    CACHE_BACKEND = 'default'
    """
    Django-Select2 uses Django's cache to sure a consistent state across multiple machines.
@@ -27,8 +26,11 @@ class Select2Conf(AppConf):
                }
            },
            'select2': {
-                'BACKEND': 'django.core.cache.backends.memcached.MemcachedCache',
-                'LOCATION': '127.0.0.1:11211',
+                "BACKEND": "django_redis.cache.RedisCache",
+                "LOCATION": "redis://127.0.0.1:6379/2",
+                "OPTIONS": {
+                    "CLIENT_CLASS": "django_redis.client.DefaultClient",
+                }
            }
        }

@@ -38,16 +40,141 @@ class Select2Conf(AppConf):
    .. tip:: To ensure a consistent state across all you machines you need to user
        a consistent external cache backend like Memcached, Redis or a database.

+    .. note::
+        Should you have copied the example configuration please make sure you
+        have Redis setup. It's recommended to run a separate Redis server in a
+        production environment.
+
    .. note:: The timeout of select2's caching backend determines
        how long a browser session can last.
        Once widget is dropped from the cache the json response view will return a 404.
    """
    CACHE_PREFIX = 'select2_'
    """
-    If you caching backend doesn't support multiple databases
+    If you caching backend does not support multiple databases
    you can isolate select2 using the cache prefix setting.
    It has set `select2_` as a default value, which you can change if needed.
    """

+    JS = '//cdnjs.cloudflare.com/ajax/libs/select2/{version}/js/select2.min.js'.format(version=LIB_VERSION)
+    """
+    The URI for the Select2 JS file. By default this points to the Cloudflare CDN.
+
+    If you want to select the version of the JS library used, or want to serve it from
+    the local 'static' resources, add a line to your settings.py like so::
+
+        SELECT2_JS = 'assets/js/select2.min.js'
+
+    If you provide your own JS and would not like Django-Select2 to load any, change
+    this setting to a blank string like so::
+
+        SELECT2_JS = ''
+
+    .. tip:: Change this setting to a local asset in your development environment to
+        develop without an Internet connection.
+    """
+
+    CSS = '//cdnjs.cloudflare.com/ajax/libs/select2/{version}/css/select2.min.css'.format(version=LIB_VERSION)
+    """
+    The URI for the Select2 CSS file. By default this points to the Cloudflare CDN.
+
+    If you want to select the version of the library used, or want to serve it from
+    the local 'static' resources, add a line to your settings.py like so::
+
+        SELECT2_CSS = 'assets/css/select2.css'
+
+    If you provide your own CSS and would not like Django-Select2 to load any, change
+    this setting to a blank string like so::
+
+        SELECT2_CSS = ''
+
+    .. tip:: Change this setting to a local asset in your development environment to
+        develop without an Internet connection.
+    """
+
+    I18N_PATH = '//cdnjs.cloudflare.com/ajax/libs/select2/{version}/js/i18n'.format(version=LIB_VERSION)
+    """
+    The base URI for the Select2 i18n files. By default this points to the Cloudflare CDN.
+
+    If you want to select the version of the I18N library used, or want to serve it from
+    the local 'static' resources, add a line to your settings.py like so::
+
+        SELECT2_I18N_PATH = 'assets/js/i18n'
+
+    .. tip:: Change this setting to a local asset in your development environment to
+        develop without an Internet connection.
+    """
+
+    I18N_AVAILABLE_LANGUAGES = [
+        'ar',
+        'az',
+        'bg',
+        'ca',
+        'cs',
+        'da',
+        'de',
+        'el',
+        'en',
+        'es',
+        'et',
+        'eu',
+        'fa',
+        'fi',
+        'fr',
+        'gl',
+        'he',
+        'hi',
+        'hr',
+        'hu',
+        'id',
+        'is',
+        'it',
+        'ja',
+        'km',
+        'ko',
+        'lt',
+        'lv',
+        'mk',
+        'ms',
+        'nb',
+        'nl',
+        'pl',
+        'pt-BR',
+        'pt',
+        'ro',
+        'ru',
+        'sk',
+        'sr-Cyrl',
+        'sr',
+        'sv',
+        'th',
+        'tr',
+        'uk',
+        'vi',
+        'zh-CN',
+        'zh-TW',
+    ]
+    """
+    List of available translations.
+
+    List of ISO 639-1 language codes that are supported by Select2.
+    If currently set language code (e.g. using the HTTP ``Accept-Language`` header)
+    is in this list, Django-Select2 will use the language code to create load
+    the proper translation.
+
+    The full path for the language file consists of::
+
+        from django.utils import translations
+
+        full_path = "{i18n_path}/{language_code}.js".format(
+            i18n_path=settings.DJANGO_SELECT2_I18N,
+            language_code=translations.get_language(),
+        )
+
+    ``settings.DJANGO_SELECT2_I18N`` refers to :attr:`.I18N_PATH`.
+    """
+
    class Meta:
+        """Prefix for all Django-Select2 settings."""
+
        prefix = 'SELECT2'
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 """
 Django-Select2 Widgets.

@@ -46,23 +45,22 @@ Light widgets are normally named, i.e. there is no
    :parts: 1

 """
-from __future__ import absolute_import, unicode_literals
-
 from functools import reduce
+from itertools import chain
+from pickle import PicklingError  # nosec

 from django import forms
 from django.core import signing
-from django.core.urlresolvers import reverse_lazy
 from django.db.models import Q
 from django.forms.models import ModelChoiceIterator
-from django.utils.encoding import force_text
+from django.urls import reverse
+from django.utils.translation import get_language

 from .cache import cache
 from .conf import settings


 class Select2Mixin(object):
-
    """
    The base mixin of all Select2 widgets.

@@ -71,9 +69,9 @@ class Select2Mixin(object):
    form media.
    """

-    def build_attrs(self, extra_attrs=None, **kwargs):
+    def build_attrs(self, *args, **kwargs):
        """Add select2 data attributes."""
-        attrs = super(Select2Mixin, self).build_attrs(extra_attrs=extra_attrs, **kwargs)
+        attrs = super(Select2Mixin, self).build_attrs(*args, **kwargs)
        if self.is_required:
            attrs.setdefault('data-allow-clear', 'false')
        else:
@@ -87,30 +85,59 @@ class Select2Mixin(object):
            attrs['class'] = 'django-select2'
        return attrs

-    def render_options(self, choices, selected_choices):
-        """Render options including an empty one, if the field is not required."""
-        output = '<option></option>' if not self.is_required else ''
-        output += super(Select2Mixin, self).render_options(choices, selected_choices)
-        return output
+    def optgroups(self, name, value, attrs=None):
+        """Add empty option for clearable selects."""
+        if not self.is_required and not self.allow_multiple_selected:
+            self.choices = list(chain([('', '')], self.choices))
+        return super(Select2Mixin, self).optgroups(name, value, attrs=attrs)

    def _get_media(self):
        """
        Construct Media as a dynamic property.

        .. Note:: For more information visit
-            https://docs.djangoproject.com/en/1.8/topics/forms/media/#media-as-a-dynamic-property
+            https://docs.djangoproject.com/en/stable/topics/forms/media/#media-as-a-dynamic-property
        """
+        lang = get_language()
+        i18n_name = None
+        select2_js = (settings.SELECT2_JS,) if settings.SELECT2_JS else ()
+        select2_css = (settings.SELECT2_CSS,) if settings.SELECT2_CSS else ()
+
+        try:
+            from django.contrib.admin.widgets import SELECT2_TRANSLATIONS
+            i18n_name = SELECT2_TRANSLATIONS.get(lang)
+            if i18n_name not in settings.SELECT2_I18N_AVAILABLE_LANGUAGES:
+                i18n_name = None
+        except ImportError:
+            # TODO: select2 widget feature needs to be backported into Django 1.11
+            try:
+                i = [x.lower() for x in settings.SELECT2_I18N_AVAILABLE_LANGUAGES].index(lang)
+                i18n_name = settings.SELECT2_I18N_AVAILABLE_LANGUAGES[i]
+            except ValueError:
+                pass
+
+        i18n_file = ('%s/%s.js' % (settings.SELECT2_I18N_PATH, i18n_name),) if i18n_name else ()
+
        return forms.Media(
-            js=('//cdnjs.cloudflare.com/ajax/libs/select2/4.0.0/js/select2.min.js',
-                'django_select2/django_select2.js'),
-            css={'screen': ('//cdnjs.cloudflare.com/ajax/libs/select2/4.0.0/css/select2.min.css',)}
+            js=select2_js + i18n_file + ('django_select2/django_select2.js',),
+            css={'screen': select2_css}
        )

    media = property(_get_media)


-class Select2Widget(Select2Mixin, forms.Select):
+class Select2TagMixin(object):
+    """Mixin to add select2 tag functionality."""

+    def build_attrs(self, *args, **kwargs):
+        """Add select2's tag attributes."""
+        self.attrs.setdefault('data-minimum-input-length', 1)
+        self.attrs.setdefault('data-tags', 'true')
+        self.attrs.setdefault('data-token-separators', '[",", " "]')
+        return super(Select2TagMixin, self).build_attrs(*args, **kwargs)
+
+
+class Select2Widget(Select2Mixin, forms.Select):
    """
    Select2 drop in widget.

@@ -135,7 +162,6 @@ class Select2Widget(Select2Mixin, forms.Select):


 class Select2MultipleWidget(Select2Mixin, forms.SelectMultiple):
-
    """
    Select2 drop in widget for multiple select.

@@ -145,36 +171,73 @@ class Select2MultipleWidget(Select2Mixin, forms.SelectMultiple):
    pass


-class HeavySelect2Mixin(Select2Mixin):
+class Select2TagWidget(Select2TagMixin, Select2Mixin, forms.SelectMultiple):
+    """
+    Select2 drop in widget for for tagging.

-    """Mixin that adds select2's ajax options and registers itself on django's cache."""
+    Example for :class:`.django.contrib.postgres.fields.ArrayField`::

-    def __init__(self, **kwargs):
+        class MyWidget(Select2TagWidget):
+
+            def value_from_datadict(self, data, files, name):
+                values = super(MyWidget, self).value_from_datadict(data, files, name):
+                return ",".join(values)
+
+            def optgroups(self, name, value, attrs=None):
+                values = value[0].split(',') if value[0] else []
+                selected = set(values)
+                subgroup = [self.create_option(name, v, v, selected, i) for i, v in enumerate(values)]
+                return [(None, subgroup, 0)]
+
+    """
+
+    pass
+
+
+class HeavySelect2Mixin(object):
+    """Mixin that adds select2's AJAX options and registers itself on Django's cache."""
+
+    dependent_fields = {}
+
+    def __init__(self, attrs=None, choices=(), **kwargs):
        """
        Return HeavySelect2Mixin.

-        :param data_view: url pattern name
-        :type data_view: str
-        :param data_url: url
-        :type data_url: str
-        :return:
+        Args:
+            data_view (str): URL pattern name
+            data_url (str): URL
+            dependent_fields (dict): Dictionary of dependent parent fields.
+                The value of the dependent field will be passed as to :func:`.filter_queryset`.
+                It can be used to further restrict the search results. For example, a city
+                widget could be dependent on a country.
+                Key is a name of a field in a form.
+                Value is a name of a field in a model (used in `queryset`).
        """
+        self.choices = choices
+        if attrs is not None:
+            self.attrs = attrs.copy()
+        else:
+            self.attrs = {}
+
        self.data_view = kwargs.pop('data_view', None)
        self.data_url = kwargs.pop('data_url', None)
+
+        dependent_fields = kwargs.pop('dependent_fields', None)
+        if dependent_fields is not None:
+            self.dependent_fields = dict(dependent_fields)
        if not (self.data_view or self.data_url):
            raise ValueError('You must ether specify "data_view" or "data_url".')
        self.userGetValTextFuncName = kwargs.pop('userGetValTextFuncName', 'null')
-        super(HeavySelect2Mixin, self).__init__(**kwargs)

    def get_url(self):
-        """Return url from instance or by reversing :attr:`.data_view`."""
+        """Return URL from instance or by reversing :attr:`.data_view`."""
        if self.data_url:
            return self.data_url
-        return reverse_lazy(self.data_view)
+        return reverse(self.data_view)

-    def build_attrs(self, extra_attrs=None, **kwargs):
-        """Set select2's ajax attributes."""
-        attrs = super(HeavySelect2Mixin, self).build_attrs(extra_attrs=extra_attrs, **kwargs)
+    def build_attrs(self, *args, **kwargs):
+        """Set select2's AJAX attributes."""
+        attrs = super(HeavySelect2Mixin, self).build_attrs(*args, **kwargs)

        # encrypt instance Id
        self.widget_id = signing.dumps(id(self))
@@ -184,13 +247,15 @@ class HeavySelect2Mixin(Select2Mixin):
        attrs.setdefault('data-ajax--cache', "true")
        attrs.setdefault('data-ajax--type', "GET")
        attrs.setdefault('data-minimum-input-length', 2)
+        if self.dependent_fields:
+            attrs.setdefault('data-select2-dependent-fields', " ".join(self.dependent_fields))

        attrs['class'] += ' django-select2-heavy'
        return attrs

-    def render(self, name, value, attrs=None, choices=()):
+    def render(self, *args, **kwargs):
        """Render widget and register it in Django's cache."""
-        output = super(HeavySelect2Mixin, self).render(name, value, attrs=attrs, choices=choices)
+        output = super(HeavySelect2Mixin, self).render(*args, **kwargs)
        self.set_to_cache()
        return output

@@ -198,34 +263,36 @@ class HeavySelect2Mixin(Select2Mixin):
        return "%s%s" % (settings.SELECT2_CACHE_PREFIX, id(self))

    def set_to_cache(self):
-        """Add widget object to Djnago's cache."""
-        cache.set(self._get_cache_key(), self)
+        """
+        Add widget object to Django's cache.

-    def render_options(self, choices, selected_choices):
-        """Render only selected options."""
-        output = ['<option></option>' if not self.is_required else '']
-        choices = {(k, v) for k, v in choices if k in selected_choices}
-        selected_choices = {force_text(v) for v in selected_choices}
-        for option_value, option_label in choices:
-            output.append(self.render_option(selected_choices, option_value, option_label))
-        return '\n'.join(output)
+        You may need to overwrite this method, to pickle all information
+        that is required to serve your JSON response view.
+        """
+        try:
+            cache.set(self._get_cache_key(), {
+                'widget': self,
+                'url': self.get_url(),
+            })
+        except (PicklingError, AttributeError):
+            msg = "You need to overwrite \"set_to_cache\" or ensure that %s is serialisable."
+            raise NotImplementedError(msg % self.__class__.__name__)


-class HeavySelect2Widget(HeavySelect2Mixin, forms.Select):
-
+class HeavySelect2Widget(HeavySelect2Mixin, Select2Widget):
    """
    Select2 widget with AJAX support that registers itself to Django's Cache.

    Usage example::

-        class MyWidget(HeavySelectWidget):
+        class MyWidget(HeavySelect2Widget):
            data_view = 'my_view_name'

    or::

        class MyForm(forms.Form):
-            my_field = forms.ChoicesField(
-                widget=HeavySelectWidget(
+            my_field = forms.ChoiceField(
+                widget=HeavySelect2Widget(
                    data_url='/url/to/json/response'
                )
            )
@@ -235,38 +302,29 @@ class HeavySelect2Widget(HeavySelect2Mixin, forms.Select):
    pass


-class HeavySelect2MultipleWidget(HeavySelect2Mixin, forms.SelectMultiple):
-
+class HeavySelect2MultipleWidget(HeavySelect2Mixin, Select2MultipleWidget):
    """Select2 multi select widget similar to :class:`.HeavySelect2Widget`."""

    pass


-class HeavySelect2TagWidget(HeavySelect2MultipleWidget):
+class HeavySelect2TagWidget(HeavySelect2Mixin, Select2TagWidget):
+    """Select2 tag widget."""

-    """Mixin to add select2 tag functionality."""
-
-    def build_attrs(self, extra_attrs=None, **kwargs):
-        """Add select2's tag attributes."""
-        attrs = super(HeavySelect2TagWidget, self).build_attrs(extra_attrs, **kwargs)
-        attrs['data-minimum-input-length'] = 1
-        attrs['data-tags'] = 'true'
-        attrs['data-token-separators'] = [",", " "]
-        return attrs
+    pass


 # Auto Heavy widgets


 class ModelSelect2Mixin(object):
-
    """Widget mixin that provides attributes and methods for :class:`.AutoResponseView`."""

    model = None
    queryset = None
    search_fields = []
    """
-    Model lookups that are used to filter the queryset.
+    Model lookups that are used to filter the QuerySet.

    Example::

@@ -283,14 +341,12 @@ class ModelSelect2Mixin(object):
        """
        Overwrite class parameters if passed as keyword arguments.

-        :param model: model to select choices from
-        :type model: django.db.models.Model
-        :param queryset: queryset to select choices from
-        :type queryset: django.db.models.query.QuerySet
-        :param search_fields: list of model lookup strings
-        :type search_fields: list
-        :param max_results: max. JsonResponse view page size
-        :type max_results: int
+        Args:
+            model (django.db.models.Model): Model to select choices from.
+            queryset (django.db.models.query.QuerySet): QuerySet to select choices from.
+            search_fields (list): List of model lookup strings.
+            max_results (int): Max. JsonResponse view page size.
+
        """
        self.model = kwargs.pop('model', self.model)
        self.queryset = kwargs.pop('queryset', self.queryset)
@@ -302,9 +358,9 @@ class ModelSelect2Mixin(object):

    def set_to_cache(self):
        """
-        Add widget's attributes to Djnago's cache.
+        Add widget's attributes to Django's cache.

-        Split the queryset, to not pickle the result set.
+        Split the QuerySet, to not pickle the result set.
        """
        queryset = self.get_queryset()
        cache.set(self._get_cache_key(), {
@@ -316,18 +372,26 @@ class ModelSelect2Mixin(object):
            'cls': self.__class__,
            'search_fields': self.search_fields,
            'max_results': self.max_results,
+            'url': self.get_url(),
+            'dependent_fields': self.dependent_fields,
        })

-    def filter_queryset(self, term, queryset=None):
+    def filter_queryset(self, term, queryset=None, **dependent_fields):
        """
-        Return queryset filtered by search_fields matching the passed term.
+        Return QuerySet filtered by search_fields matching the passed term.
+
+        Args:
+            term (str): Search term
+            queryset (django.db.models.query.QuerySet): QuerySet to select choices from.
+            **dependent_fields: Dependent fields and their values. If you want to inherit
+                from ModelSelect2Mixin and later call to this method, be sure to pop
+                everything from keyword arguments that is not a dependent field.
+
+        Returns:
+            QuerySet: Filtered QuerySet

-        :param term: Search term
-        :type term: str
-        :return: Filtered queryset
-        :rtype: :class:`.django.db.models.QuerySet`
        """
-        if not queryset:
+        if queryset is None:
            queryset = self.get_queryset()
        search_fields = self.get_search_fields()
        select = Q()
@@ -336,14 +400,18 @@ class ModelSelect2Mixin(object):
        for t in [t for t in term.split(' ') if not t == '']:
            select &= reduce(lambda x, y: x | Q(**{y: t}), search_fields,
                             Q(**{search_fields[0]: t}))
+        if dependent_fields:
+            select &= Q(**dependent_fields)
+
        return queryset.filter(select).distinct()

    def get_queryset(self):
        """
-        Return queryset based on :attr:`.queryset` or :attr:`.model`.
+        Return QuerySet based on :attr:`.queryset` or :attr:`.model`.
+
+        Returns:
+            QuerySet: QuerySet of available choices.

-        :return: queryset of available choices
-        :rtype: :class:`.django.db.models.QuerySet`
        """
        if self.queryset is not None:
            queryset = self.queryset
@@ -365,26 +433,60 @@ class ModelSelect2Mixin(object):
            return self.search_fields
        raise NotImplementedError('%s, must implement "search_fields".' % self.__class__.__name__)

-    def render_options(self, choices, selected_choices):
-        """Render only selected options and set queryset from :class:`ModelChoicesIterator`."""
-        output = ['<option></option>' if not self.is_required else '']
-        if isinstance(self.choices, ModelChoiceIterator):
-            if not self.queryset:
-                self.queryset = self.choices.queryset
-            selected_choices = {c for c in selected_choices
-                                if c not in self.choices.field.empty_values}
-            choices = {self.choices.choice(obj)
-                       for obj in self.choices.queryset.filter(pk__in=selected_choices)}
-        else:
-            choices = {(k, v) for k, v in choices if k in selected_choices}
-        selected_choices = {force_text(v) for v in selected_choices}
-        for option_value, option_label in choices:
-            output.append(self.render_option(selected_choices, option_value, option_label))
-        return '\n'.join(output)
+    def optgroups(self, name, value, attrs=None):
+        """Return only selected options and set QuerySet from `ModelChoicesIterator`."""
+        default = (None, [], 0)
+        groups = [default]
+        has_selected = False
+        selected_choices = {str(v) for v in value}
+        if not self.is_required and not self.allow_multiple_selected:
+            default[1].append(self.create_option(name, '', '', False, 0))
+        if not isinstance(self.choices, ModelChoiceIterator):
+            return super(ModelSelect2Mixin, self).optgroups(name, value, attrs=attrs)
+        selected_choices = {
+            c for c in selected_choices
+            if c not in self.choices.field.empty_values
+        }
+        field_name = self.choices.field.to_field_name or 'pk'
+        query = Q(**{'%s__in' % field_name: selected_choices})
+        for obj in self.choices.queryset.filter(query):
+            option_value = self.choices.choice(obj)[0]
+            option_label = self.label_from_instance(obj)
+
+            selected = (
+                str(option_value) in value and
+                (has_selected is False or self.allow_multiple_selected)
+            )
+            if selected is True and has_selected is False:
+                has_selected = True
+            index = len(default[1])
+            subgroup = default[1]
+            subgroup.append(self.create_option(name, option_value, option_label, selected_choices, index))
+        return groups
+
+    def label_from_instance(self, obj):
+        """
+        Return option label representation from instance.
+
+        Can be overridden to change the representation of each choice.
+
+        Example usage::
+
+            class MyWidget(ModelSelect2Widget):
+                def label_from_instance(obj):
+                    return str(obj.title).upper()
+
+        Args:
+            obj (django.db.models.Model): Instance of Django Model.
+
+        Returns:
+            str: Option label.
+
+        """
+        return str(obj)


 class ModelSelect2Widget(ModelSelect2Mixin, HeavySelect2Widget):
-
    """
    Select2 drop in model select widget.

@@ -392,7 +494,7 @@ class ModelSelect2Widget(ModelSelect2Mixin, HeavySelect2Widget):

        class MyWidget(ModelSelect2Widget):
            search_fields = [
-                'title__icontians',
+                'title__icontains',
            ]

        class MyModelForm(forms.ModelForm):
@@ -414,8 +516,8 @@ class ModelSelect2Widget(ModelSelect2Mixin, HeavySelect2Widget):
            )

    .. tip:: The ModelSelect2(Multiple)Widget will try
-        to get the queryset from the fields choices.
-        Therefore you don't need to define a queryset,
+        to get the QuerySet from the fields choices.
+        Therefore you don't need to define a QuerySet,
        if you just drop in the widget for a ForeignKey field.
    """

@@ -423,7 +525,6 @@ class ModelSelect2Widget(ModelSelect2Mixin, HeavySelect2Widget):


 class ModelSelect2MultipleWidget(ModelSelect2Mixin, HeavySelect2MultipleWidget):
-
    """
    Select2 drop in model multiple select widget.

@@ -434,13 +535,12 @@ class ModelSelect2MultipleWidget(ModelSelect2Mixin, HeavySelect2MultipleWidget):


 class ModelSelect2TagWidget(ModelSelect2Mixin, HeavySelect2TagWidget):
-
    """
-    Select2 model field with tag support.
+    Select2 model widget with tag support.

    This it not a simple drop in widget.
    It requires to implement you own :func:`.value_from_datadict`
-    that adds missing tags to you queryset.
+    that adds missing tags to you QuerySet.

    Example::

@@ -448,12 +548,12 @@ class ModelSelect2TagWidget(ModelSelect2Mixin, HeavySelect2TagWidget):
            queryset = MyModel.objects.all()

            def value_from_datadict(self, data, files, name):
-                values = super().value_from_datadict(self, data, files, name):
+                values = super().value_from_datadict(self, data, files, name)
                qs = self.queryset.filter(**{'pk__in': list(values)})
-                pks = set(force_text(getattr(o, pk)) for o in qs)
+                pks = set(str(getattr(o, pk)) for o in qs)
                cleaned_values = []
                for val in value:
-                    if force_text(val) not in pks:
+                    if str(val) not in pks:
                        val = queryset.create(title=val).pk
                    cleaned_values.append(val)
                return cleaned_values
@@ -1 +0,0 @@
-"""Django legacy file."""
@@ -1,26 +1,56 @@
-$(function () {
-    $('.django-select2').not('django-select2-heavy').select2();
-    $('.django-select2.django-select2-heavy').each(function () {
-        var field_id = $(this).data('field_id');
-        $(this).select2({
-            ajax: {
-                data: function (params) {
-                    return {
-                        term: params.term,
-                        page: params.page,
-                        field_id: field_id
-                    }
-                },
-                processResults: function (data, page) {
-                    return {
-                        results: data.results,
-                        pagination: {
-                            more: data.more
-                        }
-                  }
-                }
-            }
-        });
-    });
-});
+(function ($) {
+  var init = function ($element, options) {
+    $element.select2(options)
+  }

+  var initHeavy = function ($element, options) {
+    var settings = $.extend({
+      ajax: {
+        data: function (params) {
+          var result = {
+            term: params.term,
+            page: params.page,
+            field_id: $element.data('field_id')
+          }
+
+          var dependentFields = $element.data('select2-dependent-fields')
+          if (dependentFields) {
+            dependentFields = dependentFields.trim().split(/\s+/)
+            $.each(dependentFields, function (i, dependentField) {
+              result[dependentField] = $('[name=' + dependentField + ']', $element.closest('form')).val()
+            })
+          }
+
+          return result
+        },
+        processResults: function (data, page) {
+          return {
+            results: data.results,
+            pagination: {
+              more: data.more
+            }
+          }
+        }
+      }
+    }, options)
+
+    $element.select2(settings)
+  }
+
+  $.fn.djangoSelect2 = function (options) {
+    var settings = $.extend({}, options)
+    $.each(this, function (i, element) {
+      var $element = $(element)
+      if ($element.hasClass('django-select2-heavy')) {
+        initHeavy($element, settings)
+      } else {
+        init($element, settings)
+      }
+    })
+    return this
+  }
+
+  $(function () {
+    $('.django-select2').djangoSelect2()
+  })
+}(this.jQuery))
@@ -1,20 +1,16 @@
-# -*- coding: utf-8 -*-
 """
-Django-Select2 url config.
+Django-Select2 URL configuration.

-Add `django_select` to your urlconf **if** you use any 'Model' fields::
+Add `django_select` to your ``urlconf`` **if** you use any 'Model' fields::

    url(r'^select2/', include('django_select2.urls')),

 """
-from __future__ import absolute_import, unicode_literals
-
-from django.conf.urls import patterns, url
+from django.conf.urls import url

 from .views import AutoResponseView

-urlpatterns = patterns(
-    "",
+urlpatterns = [
    url(r"^fields/auto.json$",
        AutoResponseView.as_view(), name="django_select2-json"),
-)
+]
@@ -1,11 +1,7 @@
-# -*- coding: utf-8 -*-
 """JSONResponse views for model widgets."""
-from __future__ import absolute_import, unicode_literals
-
 from django.core import signing
 from django.core.signing import BadSignature
 from django.http import Http404, JsonResponse
-from django.utils.encoding import smart_text
 from django.views.generic.list import BaseListView

 from .cache import cache
@@ -13,7 +9,6 @@ from .conf import settings


 class AutoResponseView(BaseListView):
-
    """
    View that handles requests from heavy model widgets.

@@ -44,7 +39,7 @@ class AutoResponseView(BaseListView):
        return JsonResponse({
            'results': [
                {
-                    'text': smart_text(obj),
+                    'text': self.widget.label_from_instance(obj),
                    'id': obj.pk,
                }
                for obj in context['object_list']
@@ -53,8 +48,13 @@ class AutoResponseView(BaseListView):
        })

    def get_queryset(self):
-        """Get queryset from cached widget."""
-        return self.widget.filter_queryset(self.term, self.queryset)
+        """Get QuerySet from cached widget."""
+        kwargs = {
+            model_field_name: self.request.GET.get(form_field_name)
+            for form_field_name, model_field_name in self.widget.dependent_fields.items()
+            if form_field_name in self.request.GET and self.request.GET.get(form_field_name, '') != ''
+        }
+        return self.widget.filter_queryset(self.term, self.queryset, **kwargs)

    def get_paginate_by(self, queryset):
        """Paginate response by size of widget's `max_results` parameter."""
@@ -64,10 +64,12 @@ class AutoResponseView(BaseListView):
        """
        Get and return widget from cache.

-        Raises a 404 if the widget can not be found or no id is provided.
+        Raises:
+            Http404: If if the widget can not be found or no id is provided.
+
+        Returns:
+            ModelSelect2Mixin: Widget from cache.

-        :raises: Http404
-        :return: ModelSelect2Mixin
        """
        field_id = self.kwargs.get('field_id', self.request.GET.get('field_id', None))
        if not field_id:
@@ -81,6 +83,8 @@ class AutoResponseView(BaseListView):
            widget_dict = cache.get(cache_key)
            if widget_dict is None:
                raise Http404('field_id not found')
+            if widget_dict.pop('url') != self.request.path:
+                raise Http404('field_id was issued for the view.')
        qs, qs.query = widget_dict.pop('queryset')
        self.queryset = qs.all()
        widget_dict['queryset'] = self.queryset
@@ -46,6 +46,11 @@ html:
 	@echo
 	@echo "Build finished. The HTML pages are in $(BUILDDIR)/html."

+spelling:
+	$(SPHINXBUILD) -b spelling -W $(ALLSPHINXOPTS) $(BUILDDIR)/spelling
+	@echo
+	@echo "Spell check finished. The results are in $(BUILDDIR)/spelling."
+
 dirhtml:
 	$(SPHINXBUILD) -b dirhtml $(ALLSPHINXOPTS) $(BUILDDIR)/dirhtml
 	@echo
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 #
 # Django-Select2 documentation build configuration file, created by
 # sphinx-quickstart on Sat Aug 25 10:23:46 2012.
@@ -41,7 +40,14 @@ sys.path.insert(0, os.path.abspath('..'))

 # Add any Sphinx extension module names here, as strings. They can be extensions
 # coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
-extensions = ['sphinx.ext.autodoc',  'sphinx.ext.inheritance_diagram', 'sphinx.ext.intersphinx', 'sphinx.ext.viewcode']
+extensions = [
+    'sphinx.ext.autodoc',
+    'sphinx.ext.napoleon',
+    'sphinx.ext.inheritance_diagram',
+    'sphinx.ext.intersphinx',
+    'sphinx.ext.viewcode',
+    'sphinxcontrib.spelling',
+]

 intersphinx_mapping = {
    'python': ('http://docs.python.org/3.5', None),
@@ -49,6 +55,11 @@ intersphinx_mapping = {
               'https://docs.djangoproject.com/en/dev/_objects/'),
 }

+# spell check
+spelling_word_list_filename = 'spelling_wordlist.txt'
+spelling_show_suggestions = True
+
+
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']

@@ -62,23 +73,8 @@ source_suffix = '.rst'
 master_doc = 'index'

 # General information about the project.
-project = u'Django-Select2'
-copyright = u'%s, Nirupam Biswas' % year
-
-
-def get_version():
-    import django_select2
-
-    return django_select2.__version__
-
-# The version info for the project you're documenting, acts as replacement for
-# |version| and |release|, also used in various other places throughout the
-# built documents.
-#
-# The short X.Y version.
-version = get_version()
-# The full version, including alpha/beta/rc tags.
-release = version
+project = u'django-select2'
+copyright = u'%s, Johannes Hoppe' % year

 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
@@ -40,3 +40,47 @@ Cache
    :members:
    :undoc-members:
    :show-inheritance:
+
+
+JavaScript
+----------
+
+DjangoSelect2 handles the initialization of select2 fields automatically. Just include
+``{{ form.media.js }}`` in your template before the closing ``body`` tag. That's it!
+
+If you insert forms after page load or if you want to handle the initialization
+yourself, DjangoSelect2 provides a jQuery plugin. It will handle both normal and
+heavy fields. Simply call ``djangoSelect2(options)`` on your select fields.::
+
+        $('.django-select2').djangoSelect2();
+
+
+You can pass see `Select2 options <https://select2.github.io/options.html>`_ if needed::
+
+        $('.django-select2').djangoSelect2({placeholder: 'Select an option'});
+
+Security & Authentication
+-------------------------
+
+Security is important. Therefore make sure to read and understand what
+the security measures in place and their limitations.
+
+Set up a separate cache. If you have a public form that uses a model widget
+make sure to setup a separate cache database for Select2. An attacker
+could constantly reload your site and fill up the select2 cache.
+Having a separate cache allows you to limit the effect to select2 only.
+
+You might want to add a secure select2 JSON endpoint for data you don't
+want to be accessible to the general public. Doing so is easy::
+
+    class UserSelect2View(LoginRequiredMixin, AutoResponseView):
+        pass
+
+    class UserSelect2WidgetMixin(object):
+        def __init__(self, *args, **kwargs):
+            kwargs['data_view'] = 'user-select2-view'
+            super(UserSelect2WidgetMixin, self).__init__(*args, **kwargs)
+
+    class MySecretWidget(UserSelect2WidgetMixin, Select2ModelWidget):
+        model = MySecretModel
+        search_fields = ['title__icontains']
@@ -1 +1,3 @@
-Django >= 1.4.1
+Django >= 1.8
+sphinxcontrib-spelling
+pyenchant
@@ -0,0 +1,121 @@
+Extra
+=====
+
+Chained select2
+---------------
+
+Suppose you have an address form where a user should choose a Country and a City.
+When the user selects a country we want to show only cities belonging to that country.
+So the one selector depends on another one.
+
+Models
+``````
+
+Here are our two models:
+
+.. code-block:: python
+
+    class Country(models.Model):
+        name = models.CharField(max_length=255)
+
+
+    class City(models.Model):
+        name = models.CharField(max_length=255)
+        country = models.ForeignKey('Country', related_name="cities")
+
+
+Customizing a Form
+``````````````````
+
+Lets link two widgets via *dependent_fields*.
+
+.. code-block:: python
+    :emphasize-lines: 15
+
+    class AddressForm(forms.Form):
+        country = forms.ModelChoiceField(
+            queryset=Country.objects.all(),
+            label=u"Country",
+            widget=ModelSelect2Widget(
+                model=Country,
+                search_fields=['name__icontains'],
+            )
+        )
+
+        city = forms.ModelChoiceField(
+            queryset=City.objects.all(),
+            label=u"City",
+            widget=ModelSelect2Widget(
+                model=City,
+                search_fields=['name__icontains'],
+                dependent_fields={'country': 'country'},
+                max_results=500,
+            )
+        )
+
+
+Interdependent select2
+----------------------
+
+Also you may want not to restrict the user to which field should be selected first.
+Instead you want to suggest to the user options for any select2 depending of his selection in another one.
+
+Customize the form in a manner:
+
+.. code-block:: python
+    :emphasize-lines: 7
+
+    class AddressForm(forms.Form):
+        country = forms.ModelChoiceField(
+            queryset=Country.objects.all(),
+            label=u"Country",
+            widget=ModelSelect2Widget(
+                search_fields=['name__icontains'],
+                dependent_fields={'city': 'cities'},
+            )
+        )
+
+        city = forms.ModelChoiceField(
+            queryset=City.objects.all(),
+            label=u"City",
+            widget=ModelSelect2Widget(
+                search_fields=['name__icontains'],
+                dependent_fields={'country': 'country'},
+                max_results=500,
+            )
+        )
+
+Take attention to country's dependent_fields. The value of 'city' is 'cities' because of
+related name used in a filter condition `cities` which differs from widget field name `city`.
+
+.. caution::
+    Be aware of using interdependent select2 in parent-child relation.
+    When a child is selected, you are restricted to change parent (only one value is available).
+    Probably you should let the user reset the child first to release parent select2.
+
+
+Multi-dependent select2
+-----------------------
+
+Furthermore you may want to filter options on two or more select2 selections (some code is dropped for clarity):
+
+.. code-block:: python
+    :emphasize-lines: 14
+
+    class SomeForm(forms.Form):
+        field1 = forms.ModelChoiceField(
+            widget=ModelSelect2Widget(
+            )
+        )
+
+        field2 = forms.ModelChoiceField(
+            widget=ModelSelect2Widget(
+            )
+        )
+
+        field3 = forms.ModelChoiceField(
+            widget=ModelSelect2Widget(
+                dependent_fields={'field1': 'field1', 'field2': 'field2'},
+            )
+        )
+
@@ -18,10 +18,39 @@ Installation
 2. Add ``django_select2`` to your ``INSTALLED_APPS`` in your project settings.


-3. Add ``django_select`` to your urlconf **if** you use any 'Auto' fields::
+3. Add ``django_select`` to your ``urlconf`` **if** you use any
+:class:`ModelWidgets <.django_select2.forms.ModelSelect2Mixin>`::

        url(r'^select2/', include('django_select2.urls')),

+Quick Start
+-----------
+
+Here is a quick example to get you started:
+
+0. Follow the installation instructions above.
+
+1. Add a select2 widget to the form. For example if you wanted Select2 with multi-select you would use
+``Select2MultipleWidget``
+Replacing::
+
+        class MyForm(forms.Form):
+            things = ModelMultipleChoiceField(queryset=Thing.objects.all())
+
+with::
+
+        class MyForm(forms.Form):
+            things = ModelMultipleChoiceField(queryset=Thing.objects.all(), widget=Select2MultipleWidget)
+
+2. Add the CSS to the ``head`` of your Django template::
+
+        {{ form.media.css }}
+
+3. Add the JavaScript to the end of the ``body`` of your Django template::
+
+        {{ form.media.js }}
+
+4. Done - enjoy the wonders of Select2!

 External Dependencies
 ---------------------
@@ -14,6 +14,7 @@ Contents:

   get_started
   django_select2
+   extra

 Indices and tables
 ==================
@@ -0,0 +1,18 @@
+jQuery
+Django
+mixin
+backend
+redis
+memcached
+AJAX
+Cloudflare
+lookup
+QuerySet
+pre
+py
+lookups
+functionalities
+plugin
+multi
+Indices
+clearable
@@ -0,0 +1,14 @@
+coverage
+django-appconf
+flake8
+pep8-naming
+mccabe
+isort
+pydocstyle
+pytest
+pytest-django
+selenium
+sphinx==1.6.5
+sphinxcontrib-spelling
+pyenchant
+django-redis
@@ -0,0 +1 @@
+django-appconf>=0.6.0
@@ -1,19 +0,0 @@
-e .
-django-appconf==1.0.1
-django==1.8.4             # via model-mommy
-flake8==2.4.1
-isort==4.2.2
-mccabe==0.3.1             # via flake8
-mock==1.3.0               # via model-mommy
-model-mommy==1.2.5
-pbr==1.8.0                # via mock
-pep257==0.5.0
-pep8-naming==0.3.3
-pep8==1.5.7               # via flake8
-py==1.4.30                # via pytest
-pyflakes==0.8.1           # via flake8
-pytest-django==2.8.0
-pytest==2.7.2
-requests==2.7.0
-selenium==2.46.0
-six==1.9.0                # via django-appconf, mock, model-mommy
@@ -1,5 +1,27 @@
-[pytest]
-norecursedirs = env
+[metadata]
+name = django-select2
+author = Johannes Hoppe
+author-email = info@johanneshoppe.com
+summary = Select2 option fields for Django.
+description-file = README.rst
+home-page = https://github.com/applegrew/django-select2
+license = Apache-2
+classifier =
+    Development Status :: 5 - Production/Stable
+    Environment :: Web Environment
+    Intended Audience :: Developers
+    License :: OSI Approved :: Apache Software License
+    Operating System :: OS Independent
+    Programming Language :: Python
+    Programming Language :: Python :: 3
+    Framework :: Django
+
+[files]
+packages =
+    django_select2
+
+[tool:pytest]
+norecursedirs = env docs
 addopts = --tb=short -rxs
 DJANGO_SETTINGS_MODULE=tests.testapp.settings

@@ -8,16 +30,20 @@ max-line-length = 120
 max-complexity = 10
 statistics = true
 show-source = true
-exclude = docs,runtests.py,setup.py,env
+exclude = docs,runtests.py,setup.py,.tox,env

 [pep257]
-explain = true
-count = true
+match = (?!setup).*.py
+match-dir = (?!tests|env|docs|\.).*

 [isort]
 atomic = true
 multi_line_output = 5
 line_length = 79
-skip = manage.py,docs
-known_first_party = django_select2
+skip = manage.py,docs,.tox,env
+known_first_party = django_select2, tests
+known_third_party = django
 combine_as_imports = true
+
+[bdist_rpm]
+requires = python-django-appconf >= 0.6
@@ -1,71 +1,8 @@
 #!/usr/bin/env python
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
-import codecs
-import os
-
-from setuptools import Command, find_packages, setup
-
-
-def read(file_name):
-    file_path = os.path.join(os.path.dirname(__file__), file_name)
-    return codecs.open(file_path, encoding='utf-8').read()
-
-
-PACKAGE = "django_select2"
-NAME = "Django-Select2"
-DESCRIPTION = "Select2 option fields for Django"
-AUTHOR = "Nirupam Biswas, Johannes Hoppe"
-AUTHOR_EMAIL = "admin@applegrew.com"
-URL = "https://github.com/applegrew/django-select2"
-VERSION = __import__(PACKAGE).__version__
-
-
-class PyTest(Command):
-    user_options = []
-
-    def initialize_options(self):
-        pass
-
-    def finalize_options(self):
-        pass
-
-    def run(self):
-        import sys
-        import subprocess
-
-        errno = subprocess.call([sys.executable, 'runtests.py'])
-        raise SystemExit(errno)

+from setuptools import setup

 setup(
-    name=NAME,
-    version=VERSION,
-    description=DESCRIPTION,
-    long_description=read("README.md"),
-    author=AUTHOR,
-    author_email=AUTHOR_EMAIL,
-    license="LICENSE.txt",
-    url=URL,
-    packages=find_packages(),
-    include_package_data=True,
-    classifiers=[
-        "Development Status :: 5 - Production/Stable",
-        "Environment :: Web Environment",
-        "Intended Audience :: Developers",
-        "License :: OSI Approved :: Apache Software License",
-        "Operating System :: OS Independent",
-        "Programming Language :: Python",
-        "Programming Language :: Python :: 2",
-        "Programming Language :: Python :: 3",
-        "Framework :: Django :: 1.7",
-        "Framework :: Django :: 1.8",
-        "Framework :: Django",
-    ],
-    install_requires=[
-        'django-appconf>=0.6.0',
-    ],
-    zip_safe=False,
-    cmdclass={'test': PyTest},
+    setup_requires=['pbr'],
+    pbr=True,
 )
@@ -1 +0,0 @@
-__author__ = 'johannes'
@@ -1,41 +1,66 @@
-# -*- coding:utf-8 -*-
-from __future__ import absolute_import, print_function, unicode_literals
-
-import os
+import random
+import string

 import pytest
-from model_mommy import mommy
+from django.utils.encoding import force_text
 from selenium import webdriver
 from selenium.common.exceptions import WebDriverException

-browsers = {
-    # 'firefox': webdriver.Firefox,
-    # 'chrome': webdriver.Chrome,
-    'phantomjs': webdriver.PhantomJS,
-}
+
+def random_string(n):
+    return ''.join(
+        random.choice(string.ascii_uppercase + string.digits)
+        for _ in range(n)
+    )


-@pytest.fixture(scope='session',
-                params=browsers.keys())
-def driver(request):
-    if 'DISPLAY' not in os.environ:
-        pytest.skip('Test requires display server (export DISPLAY)')
+def random_name(n):
+    words = ''.join(random.choice(string.ascii_lowercase + ' ') for _ in range(n)).strip().split(' ')
+    return '-'.join([x.capitalize() for x in words])

+
+@pytest.yield_fixture(scope='session')
+def driver():
+    chrome_options = webdriver.ChromeOptions()
+    chrome_options.add_argument('headless')
+    chrome_options.add_argument('window-size=1200x800')
    try:
-        b = browsers[request.param]()
+        b = webdriver.Chrome(chrome_options=chrome_options)
    except WebDriverException as e:
-        pytest.skip(e)
+        pytest.skip(force_text(e))
    else:
-        b.set_window_size(1200, 800)
-        request.addfinalizer(lambda *args: b.quit())
-        return b
+        yield b
+        b.quit()


@pytest.fixture
 def genres(db):
-    return mommy.make('testapp.Genre', _quantity=100)
+    from .testapp.models import Genre
+
+    return Genre.objects.bulk_create(
+        [Genre(pk=pk, title=random_string(50)) for pk in range(100)]
+    )


@pytest.fixture
 def artists(db):
-    return mommy.make('testapp.Artist', _quantity=100)
+    from .testapp.models import Artist
+    return Artist.objects.bulk_create(
+        [Artist(pk=pk, title=random_string(50)) for pk in range(100)]
+    )
+
+
+@pytest.fixture
+def countries(db):
+    from .testapp.models import Country
+    return Country.objects.bulk_create(
+        [Country(pk=pk, name=random_name(random.randint(10, 20))) for pk in range(10)]
+    )
+
+
+@pytest.fixture
+def cities(db, countries):
+    from .testapp.models import City
+    return City.objects.bulk_create(
+        [City(pk=pk, name=random_name(random.randint(5, 15)), country=random.choice(countries)) for pk in range(100)]
+    )
@@ -1,7 +1,3 @@
-# -*- coding:utf-8 -*-
-from __future__ import absolute_import, unicode_literals
-
-
 def test_default_cache():
    from django_select2.cache import cache

@@ -1,35 +1,47 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, unicode_literals
-
 import collections
 import json
+import os

 import pytest
 from django.core import signing
-from django.core.urlresolvers import reverse
 from django.db.models import QuerySet
+from django.utils import translation
 from django.utils.encoding import force_text
-from model_mommy import mommy
+from django.utils.six import text_type
 from selenium.common.exceptions import NoSuchElementException
-from six import text_type
+from selenium.webdriver.common.by import By
+from selenium.webdriver.support import expected_conditions
+from selenium.webdriver.support.wait import WebDriverWait

 from django_select2.cache import cache
+from django_select2.conf import settings
 from django_select2.forms import (
-    HeavySelect2Widget, ModelSelect2TagWidget, ModelSelect2Widget,
-    Select2Widget
+    HeavySelect2MultipleWidget, HeavySelect2Widget, ModelSelect2TagWidget,
+    ModelSelect2Widget, Select2Widget
 )
 from tests.testapp import forms
 from tests.testapp.forms import (
    NUMBER_CHOICES, HeavySelect2MultipleWidgetForm, TitleModelSelect2Widget
 )
-from tests.testapp.models import Genre
+from tests.testapp.models import Artist, City, Country, Genre, Groupie
+
+try:
+    from django.urls import reverse
+except ImportError:
+    from django.core.urlresolvers import reverse


 class TestSelect2Mixin(object):
    url = reverse('select2_widget')
    form = forms.AlbumSelect2WidgetForm()
+    multiple_form = forms.AlbumSelect2MultipleWidgetForm()
    widget_cls = Select2Widget

+    def test_initial_data(self, genres):
+        genre = genres[0]
+        form = self.form.__class__(initial={'primary_genre': genre.pk})
+        assert text_type(genre) in form.as_p()
+
    def test_initial_form_class(self):
        widget = self.widget_cls(attrs={'class': 'my-class'})
        assert 'my-class' in widget.render('name', None)
@@ -40,7 +52,7 @@ class TestSelect2Mixin(object):
        assert required_field.required is True
        assert 'data-allow-clear="true"' not in required_field.widget.render('artist', None)
        assert 'data-allow-clear="false"' in required_field.widget.render('artist', None)
-        assert '<option></option>' not in required_field.widget.render('artist', None)
+        assert '<option value=""></option>' not in required_field.widget.render('artist', None)

        not_required_field = self.form.fields['primary_genre']
        assert not_required_field.required is False
@@ -48,7 +60,7 @@ class TestSelect2Mixin(object):
        assert 'data-allow-clear="false"' not in not_required_field.widget.render('primary_genre',
                                                                                  None)
        assert 'data-placeholder' in not_required_field.widget.render('primary_genre', None)
-        assert '<option></option>' in not_required_field.widget.render('primary_genre', None)
+        assert '<option value=""></option>' in not_required_field.widget.render('primary_genre', None)

    def test_no_js_error(self, db, live_server, driver):
        driver.get(live_server + self.url)
@@ -78,14 +90,107 @@ class TestSelect2Mixin(object):
        widget = HeavySelect2Widget(data_url='/foo/bar')
        assert widget.get_url() == '/foo/bar'

+    def test_empty_option(self, db):
+        # Empty options is only required for single selects
+        # https://select2.github.io/options.html#allowClear
+        single_select = self.form.fields['primary_genre']
+        assert single_select.required is False
+        assert '<option value=""></option>' in single_select.widget.render('primary_genre', None)
+
+        multiple_select = self.multiple_form.fields['featured_artists']
+        assert multiple_select.required is False
+        assert multiple_select.widget.allow_multiple_selected
+        assert '<option value=""></option>' not in multiple_select.widget.render('featured_artists', None)
+
+    def test_i18n(self):
+        translation.activate('de')
+        assert tuple(Select2Widget().media._js) == (
+            f'//cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/select2.min.js',
+            f'//cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/i18n/de.js',
+            'django_select2/django_select2.js'
+        )
+
+        translation.activate('en')
+        assert tuple(Select2Widget().media._js) == (
+            f'//cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/select2.min.js',
+            f'//cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/i18n/en.js',
+            'django_select2/django_select2.js'
+        )
+
+        translation.activate('00')
+        assert tuple(Select2Widget().media._js) == (
+            f'//cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/select2.min.js',
+            'django_select2/django_select2.js'
+        )
+
+        translation.activate('sr-cyrl')
+        assert tuple(Select2Widget().media._js) == (
+            f'//cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/select2.min.js',
+            f'//cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/i18n/sr-Cyrl.js',
+            'django_select2/django_select2.js'
+        )
+
+        pytest.importorskip("django", minversion="2.0.4")
+
+        translation.activate('zh-hans')
+        assert tuple(Select2Widget().media._js) == (
+            f'//cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/select2.min.js',
+            f'//cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/i18n/zh-CN.js',
+            'django_select2/django_select2.js'
+        )
+
+        translation.activate('zh-hant')
+        assert tuple(Select2Widget().media._js) == (
+            f'//cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/select2.min.js',
+            f'//cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/i18n/zh-TW.js',
+            'django_select2/django_select2.js'
+        )
+
+
+class TestSelect2MixinSettings(object):
+    def test_default_media(self):
+        sut = Select2Widget()
+        result = sut.media.render()
+        assert f'//cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/js/select2.min.js' in result
+        assert f'//cdnjs.cloudflare.com/ajax/libs/select2/{settings.SELECT2_LIB_VERSION}/css/select2.min.css' in result
+        assert 'django_select2/django_select2.js' in result
+
+    def test_js_setting(self, settings):
+        settings.SELECT2_JS = 'alternate.js'
+        sut = Select2Widget()
+        result = sut.media.render()
+        assert 'alternate.js' in result
+        assert 'django_select2/django_select2.js' in result
+
+    def test_empty_js_setting(self, settings):
+        settings.SELECT2_JS = ''
+        sut = Select2Widget()
+        result = sut.media.render()
+        assert 'django_select2/django_select2.js' in result
+
+    def test_css_setting(self, settings):
+        settings.SELECT2_CSS = 'alternate.css'
+        sut = Select2Widget()
+        result = sut.media.render()
+        assert 'alternate.css' in result
+
+    def test_empty_css_setting(self, settings):
+        settings.SELECT2_CSS = ''
+        sut = Select2Widget()
+        result = sut.media.render()
+        assert '.css' not in result
+

 class TestHeavySelect2Mixin(TestSelect2Mixin):
    url = reverse('heavy_select2_widget')
-    form = forms.HeavySelect2WidgetForm(initial={'primary_genre': [1]})
+    form = forms.HeavySelect2WidgetForm(initial={'primary_genre': 1})
    widget_cls = HeavySelect2Widget

+    def test_initial_data(self):
+        assert 'One' in self.form.as_p()
+
    def test_initial_form_class(self):
-        widget = self.widget_cls(data_view='heavy_data', attrs={'class': 'my-class'})
+        widget = self.widget_cls(data_view='heavy_data_1', attrs={'class': 'my-class'})
        assert 'my-class' in widget.render('name', None)
        assert 'django-select2' in widget.render('name', None)
        assert 'django-select2-heavy' in widget.render('name', None), widget.render('name', None)
@@ -94,27 +199,81 @@ class TestHeavySelect2Mixin(TestSelect2Mixin):
        not_required_field = self.form.fields['primary_genre']
        assert not_required_field.required is False
        assert '<option value="1" selected="selected">One</option>' in \
-               not_required_field.widget.render('primary_genre', 1, choices=NUMBER_CHOICES), \
-            not_required_field.widget.render('primary_genre', 1, choices=NUMBER_CHOICES)
+               not_required_field.widget.render('primary_genre', 1) or \
+            '<option value="1" selected>One</option>' in \
+            not_required_field.widget.render('primary_genre', 1), \
+            not_required_field.widget.render('primary_genre', 1)

    def test_many_selected_option(self, db, genres):
        field = HeavySelect2MultipleWidgetForm().fields['genres']
-        widget_output = field.widget.render(
-            'genres', [1, 2],
-            choices=NUMBER_CHOICES)
+        field.widget.choices = NUMBER_CHOICES
+        widget_output = field.widget.render('genres', [1, 2])
        selected_option = '<option value="{pk}" selected="selected">{value}</option>'.format(pk=1, value='One')
+        selected_option_a = '<option value="{pk}" selected>{value}</option>'.format(pk=1, value='One')
        selected_option2 = '<option value="{pk}" selected="selected">{value}</option>'.format(pk=2, value='Two')
+        selected_option2a = '<option value="{pk}" selected>{value}</option>'.format(pk=2, value='Two')

-        assert selected_option in widget_output, widget_output
-        assert selected_option2 in widget_output
+        assert selected_option in widget_output or selected_option_a in widget_output, widget_output
+        assert selected_option2 in widget_output or selected_option2a in widget_output
+
+    def test_multiple_widgets(self, db, live_server, driver):
+        driver.get(live_server + self.url)
+        with pytest.raises(NoSuchElementException):
+            driver.find_element_by_css_selector('.select2-results')
+
+        elem1, elem2 = driver.find_elements_by_css_selector('.select2-selection')
+        elem1.click()
+
+        result1 = WebDriverWait(driver, 60).until(
+            expected_conditions.presence_of_element_located((By.CSS_SELECTOR, '.select2-results li:first-child'))
+        ).text
+        elem2.click()
+        result2 = WebDriverWait(driver, 60).until(
+            expected_conditions.presence_of_element_located((By.CSS_SELECTOR, '.select2-results li:first-child'))
+        ).text
+
+        assert result1 != result2
+
+        with pytest.raises(NoSuchElementException):
+            error = driver.find_element_by_xpath('//body[@JSError]')
+            pytest.fail(error.get_attribute('JSError'))
+
+    def test_get_url(self):
+        widget = self.widget_cls(data_view='heavy_data_1', attrs={'class': 'my-class'})
+        assert isinstance(widget.get_url(), text_type)
+
+    def test_can_not_pickle(self):
+        widget = self.widget_cls(data_view='heavy_data_1', attrs={'class': 'my-class'})
+
+        class NoPickle(object):
+            pass
+
+        widget.no_pickle = NoPickle()
+        with pytest.raises(NotImplementedError):
+            widget.set_to_cache()


 class TestModelSelect2Mixin(TestHeavySelect2Mixin):
    form = forms.AlbumModelSelect2WidgetForm(initial={'primary_genre': 1})
+    multiple_form = forms.ArtistModelSelect2MultipleWidgetForm()
+
+    def test_initial_data(self, genres):
+        genre = genres[0]
+        form = self.form.__class__(initial={'primary_genre': genre.pk})
+        assert text_type(genre) in form.as_p()
+
+    def test_label_from_instance_initial(self, genres):
+        genre = genres[0]
+        genre.title = genre.title.lower()
+        genre.save()
+
+        form = self.form.__class__(initial={'primary_genre': genre.pk})
+        assert genre.title not in form.as_p(), form.as_p()
+        assert genre.title.upper() in form.as_p()

    @pytest.fixture(autouse=True)
-    def genres(self, db):
-        return mommy.make(Genre, 100)
+    def genres(self, genres):
+        return genres

    def test_selected_option(self, db, genres):
        genre = genres[0]
@@ -125,12 +284,32 @@ class TestModelSelect2Mixin(TestHeavySelect2Mixin):
            'primary_genre', genre.pk)
        selected_option = '<option value="{pk}" selected="selected">{value}</option>'.format(
            pk=genre.pk, value=force_text(genre))
+        selected_option_a = '<option value="{pk}" selected>{value}</option>'.format(
+            pk=genre.pk, value=force_text(genre))
        unselected_option = '<option value="{pk}">{value}</option>'.format(
            pk=genre2.pk, value=force_text(genre2))

-        assert selected_option in widget_output, widget_output
+        assert selected_option in widget_output or selected_option_a in widget_output, widget_output
        assert unselected_option not in widget_output

+    def test_selected_option_label_from_instance(self, db, genres):
+        genre = genres[0]
+        genre.title = genre.title.lower()
+        genre.save()
+
+        field = self.form.fields['primary_genre']
+        widget_output = field.widget.render('primary_genre', genre.pk)
+
+        def get_selected_options(genre):
+            return '<option value="{pk}" selected="selected">{value}</option>'.format(
+                pk=genre.pk, value=force_text(genre)), '<option value="{pk}" selected>{value}</option>'.format(
+                pk=genre.pk, value=force_text(genre))
+
+        assert all(o not in widget_output for o in get_selected_options(genre))
+        genre.title = genre.title.upper()
+
+        assert any(o in widget_output for o in get_selected_options(genre))
+
    def test_get_queryset(self):
        widget = ModelSelect2Widget()
        with pytest.raises(NotImplementedError):
@@ -192,6 +371,16 @@ class TestModelSelect2Mixin(TestHeavySelect2Mixin):
        assert isinstance(cached_widget['queryset'][0], qs.__class__)
        assert text_type(cached_widget['queryset'][1]) == text_type(qs.query)

+    def test_get_url(self):
+        widget = ModelSelect2Widget(queryset=Genre.objects.all(), search_fields=['title__icontains'])
+        assert isinstance(widget.get_url(), text_type)
+
+    def test_custom_to_field_name(self):
+        the_best_band_in_the_world = Artist.objects.create(title='Take That')
+        groupie = Groupie.objects.create(obsession=the_best_band_in_the_world)
+        form = forms.GroupieForm(instance=groupie)
+        assert '<option value="Take That" selected>TAKE THAT</option>' in form.as_p()
+

 class TestHeavySelect2TagWidget(TestHeavySelect2Mixin):

@@ -201,3 +390,101 @@ class TestHeavySelect2TagWidget(TestHeavySelect2Mixin):
        assert 'data-minimum-input-length="1"' in output
        assert 'data-tags="true"' in output
        assert 'data-token-separators' in output
+
+    def test_custom_tag_attrs(self):
+        widget = ModelSelect2TagWidget(
+            queryset=Genre.objects.all(), search_fields=['title__icontains'], attrs={'data-minimum-input-length': '3'})
+        output = widget.render('name', 'value')
+        assert 'data-minimum-input-length="3"' in output
+
+
+class TestHeavySelect2MultipleWidget(object):
+    url = reverse('heavy_select2_multiple_widget')
+    form = forms.HeavySelect2MultipleWidgetForm()
+    widget_cls = HeavySelect2MultipleWidget
+
+    @pytest.mark.xfail(bool(os.environ.get('CI', False)),
+                       reason='https://bugs.chromium.org/p/chromedriver/issues/detail?id=1772')
+    def test_widgets_selected_after_validation_error(self, db, live_server, driver):
+        driver.get(live_server + self.url)
+        WebDriverWait(driver, 3).until(
+            expected_conditions.presence_of_element_located((By.ID, 'id_title'))
+        )
+        title = driver.find_element_by_id('id_title')
+        title.send_keys('fo')
+        genres, fartists = driver.find_elements_by_css_selector('.select2-selection--multiple')
+        genres.click()
+        genres.send_keys('o')  # results are Zero One Two Four
+        # select second element - One
+        driver.find_element_by_css_selector('.select2-results li:nth-child(2)').click()
+        genres.submit()
+        # there is a ValidationError raised, check for it
+        errstring = WebDriverWait(driver, 3).until(
+            expected_conditions.presence_of_element_located((By.CSS_SELECTOR, 'ul.errorlist li'))
+        ).text
+        assert errstring == "Title must have more than 3 characters."
+        # genres should still have One as selected option
+        result_title = driver.find_element_by_css_selector('.select2-selection--multiple li').get_attribute('title')
+        assert result_title == 'One'
+
+
+class TestAddressChainedSelect2Widget(object):
+    url = reverse('model_chained_select2_widget')
+    form = forms.AddressChainedSelect2WidgetForm()
+
+    def test_widgets_selected_after_validation_error(self, db, live_server, driver, countries, cities):
+        driver.get(live_server + self.url)
+
+        WebDriverWait(driver, 60).until(
+            expected_conditions.presence_of_element_located((By.CSS_SELECTOR, '.select2-selection--single'))
+        )
+        country_container, city_container = driver.find_elements_by_css_selector('.select2-selection--single')
+
+        # clicking city select2 lists all available cities
+        city_container.click()
+        WebDriverWait(driver, 60).until(
+            expected_conditions.presence_of_element_located((By.CSS_SELECTOR, '.select2-results li'))
+        )
+        city_options = driver.find_elements_by_css_selector('.select2-results li')
+        city_names_from_browser = {option.text for option in city_options}
+        city_names_from_db = set(City.objects.values_list('name', flat=True))
+        assert len(city_names_from_browser) == City.objects.count()
+        assert city_names_from_browser == city_names_from_db
+
+        # selecting a country really does it
+        country_container.click()
+        WebDriverWait(driver, 60).until(
+            expected_conditions.presence_of_element_located((By.CSS_SELECTOR, '.select2-results li:nth-child(2)'))
+        )
+        country_option = driver.find_element_by_css_selector('.select2-results li:nth-child(2)')
+        country_name = country_option.text
+        country_option.click()
+        assert country_name == country_container.text
+
+        # clicking city select2 lists reduced list of cities belonging to the country
+        city_container.click()
+        WebDriverWait(driver, 60).until(
+            expected_conditions.presence_of_element_located((By.CSS_SELECTOR, '.select2-results li'))
+        )
+        city_options = driver.find_elements_by_css_selector('.select2-results li')
+        city_names_from_browser = {option.text for option in city_options}
+        city_names_from_db = set(Country.objects.get(name=country_name).cities.values_list('name', flat=True))
+        assert len(city_names_from_browser) != City.objects.count()
+        assert city_names_from_browser == city_names_from_db
+
+        # selecting a city reaaly does it
+        city_option = driver.find_element_by_css_selector('.select2-results li:nth-child(2)')
+        city_name = city_option.text
+        city_option.click()
+        assert city_name == city_container.text
+
+        # clicking country select2 lists reduced list to the only country available to the city
+        country_container.click()
+        WebDriverWait(driver, 60).until(
+            expected_conditions.presence_of_element_located((By.CSS_SELECTOR, '.select2-results li'))
+        )
+        country_options = driver.find_elements_by_css_selector('.select2-results li')
+        country_names_from_browser = {option.text for option in country_options}
+        country_names_from_db = {City.objects.get(name=city_name).country.name}
+        assert len(country_names_from_browser) != Country.objects.count()
+        assert country_names_from_browser == country_names_from_db
@@ -1,16 +1,20 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, unicode_literals
-
 import json

 from django.core import signing
-from django.core.urlresolvers import reverse
 from django.utils.encoding import smart_text

+from django_select2.cache import cache
 from django_select2.forms import ModelSelect2Widget
-from tests.testapp.forms import AlbumModelSelect2WidgetForm
+from tests.testapp.forms import (
+    AlbumModelSelect2WidgetForm, ArtistCustomTitleWidget
+)
 from tests.testapp.models import Genre

+try:
+    from django.urls import reverse
+except ImportError:
+    from django.core.urlresolvers import reverse
+

 class TestAutoResponseView(object):
    def test_get(self, client, artists):
@@ -66,3 +70,32 @@ class TestAutoResponseView(object):
        assert response.status_code == 200
        data = json.loads(response.content.decode('utf-8'))
        assert data['more'] is False
+
+    def test_label_from_instance(self, artists, client):
+        url = reverse('django_select2-json')
+
+        form = AlbumModelSelect2WidgetForm()
+        form.fields['artist'].widget = ArtistCustomTitleWidget()
+        assert form.as_p()
+        field_id = signing.dumps(id(form.fields['artist'].widget))
+
+        artist = artists[0]
+        response = client.get(url, {'field_id': field_id, 'term': artist.title})
+        assert response.status_code == 200
+
+        data = json.loads(response.content.decode('utf-8'))
+        assert data['results']
+        assert {'id': artist.pk, 'text': smart_text(artist.title.upper())} in data['results']
+
+    def test_url_check(self, client, artists):
+        artist = artists[0]
+        form = AlbumModelSelect2WidgetForm()
+        assert form.as_p()
+        field_id = signing.dumps(id(form.fields['artist'].widget))
+        cache_key = form.fields['artist'].widget._get_cache_key()
+        widget_dict = cache.get(cache_key)
+        widget_dict['url'] = 'yet/another/url'
+        cache.set(cache_key, widget_dict)
+        url = reverse('django_select2-json')
+        response = client.get(url, {'field_id': field_id, 'term': artist.title})
+        assert response.status_code == 404
@@ -1,7 +1,5 @@
-# -*- coding:utf-8 -*-
-from __future__ import absolute_import, unicode_literals
-
 from django import forms
+from django.utils.encoding import force_text

 from django_select2.forms import (
    HeavySelect2MultipleWidget, HeavySelect2Widget, ModelSelect2MultipleWidget,
@@ -9,7 +7,7 @@ from django_select2.forms import (
    Select2Widget
 )
 from tests.testapp import models
-from tests.testapp.models import Album
+from tests.testapp.models import Album, City, Country


 class TitleSearchFieldMixin(object):
@@ -34,6 +32,26 @@ class GenreSelect2TagWidget(TitleSearchFieldMixin, ModelSelect2TagWidget):
        self.get_queryset().create(title=value)


+class ArtistCustomTitleWidget(ModelSelect2Widget):
+    model = models.Artist
+    search_fields = [
+        'title__icontains'
+    ]
+
+    def label_from_instance(self, obj):
+        return force_text(obj.title).upper()
+
+
+class GenreCustomTitleWidget(ModelSelect2Widget):
+    model = models.Genre
+    search_fields = [
+        'title__icontains'
+    ]
+
+    def label_from_instance(self, obj):
+        return force_text(obj.title).upper()
+
+
 class AlbumSelect2WidgetForm(forms.ModelForm):
    class Meta:
        model = models.Album
@@ -69,16 +87,14 @@ class AlbumModelSelect2WidgetForm(forms.ModelForm):
            'primary_genre',
        )
        widgets = {
-            'artist': ModelSelect2Widget(
-                model=models.Artist,
-                search_fields=['title__icontains']
-            ),
-            'primary_genre': ModelSelect2Widget(
-                model=models.Genre,
-                search_fields=['title__icontains']
-            ),
+            'artist': ArtistCustomTitleWidget(),
+            'primary_genre': GenreCustomTitleWidget(),
        }

+    def __init__(self, *args, **kwargs):
+        super(AlbumModelSelect2WidgetForm, self).__init__(*args, **kwargs)
+        self.fields['primary_genre'].initial = 2
+

 class AlbumModelSelect2MultipleWidgetRequiredForm(forms.ModelForm):
    class Meta:
@@ -98,7 +114,13 @@ class ArtistModelSelect2MultipleWidgetForm(forms.Form):
    genres = forms.ModelMultipleChoiceField(widget=ModelSelect2MultipleWidget(
        queryset=models.Genre.objects.all(),
        search_fields=['title__icontains'],
-    ), queryset=models.Genre.objects.all(), required=False)
+    ), queryset=models.Genre.objects.all(), required=True)
+
+    featured_artists = forms.ModelMultipleChoiceField(widget=ModelSelect2MultipleWidget(
+        queryset=models.Artist.objects.all(),
+        search_fields=['title__icontains'],
+    ), queryset=models.Artist.objects.all(), required=False)
+

 NUMBER_CHOICES = [
    (1, 'One'),
@@ -114,23 +136,33 @@ class Select2WidgetForm(forms.Form):

 class HeavySelect2WidgetForm(forms.Form):
    artist = forms.ChoiceField(
-        widget=HeavySelect2Widget(data_view='heavy_data', choices=NUMBER_CHOICES)
+        widget=HeavySelect2Widget(data_view='heavy_data_1'),
+        choices=NUMBER_CHOICES
    )
    primary_genre = forms.ChoiceField(
-        widget=HeavySelect2Widget(data_view='heavy_data', choices=NUMBER_CHOICES),
-        required=False
+        widget=HeavySelect2Widget(data_view='heavy_data_2'),
+        required=False,
+        choices=NUMBER_CHOICES
    )


 class HeavySelect2MultipleWidgetForm(forms.Form):
+    title = forms.CharField(max_length=50)
    genres = forms.MultipleChoiceField(
-        widget=HeavySelect2MultipleWidget(data_view='heavy_data', choices=NUMBER_CHOICES)
+        widget=HeavySelect2MultipleWidget(data_view='heavy_data_1', choices=NUMBER_CHOICES),
+        choices=NUMBER_CHOICES
    )
    featured_artists = forms.MultipleChoiceField(
-        widget=HeavySelect2MultipleWidget(data_view='heavy_data', choices=NUMBER_CHOICES),
+        widget=HeavySelect2MultipleWidget(data_view='heavy_data_2', choices=NUMBER_CHOICES),
+        choices=NUMBER_CHOICES,
        required=False
    )

+    def clean_title(self):
+        if len(self.cleaned_data['title']) < 3:
+            raise forms.ValidationError("Title must have more than 3 characters.")
+        return self.cleaned_data["title"]
+

 class ModelSelect2TagWidgetForm(forms.ModelForm):
    class Meta:
@@ -139,3 +171,36 @@ class ModelSelect2TagWidgetForm(forms.ModelForm):
        widgets = {
            'genres': GenreSelect2TagWidget
        }
+
+
+class AddressChainedSelect2WidgetForm(forms.Form):
+    country = forms.ModelChoiceField(
+        queryset=Country.objects.all(),
+        label='Country',
+        widget=ModelSelect2Widget(
+            model=Country,
+            search_fields=['name__icontains'],
+            max_results=500,
+            dependent_fields={'city': 'cities'},
+        )
+    )
+
+    city = forms.ModelChoiceField(
+        queryset=City.objects.all(),
+        label='City',
+        widget=ModelSelect2Widget(
+            model=City,
+            search_fields=['name__icontains'],
+            dependent_fields={'country': 'country'},
+            max_results=500,
+        )
+    )
+
+
+class GroupieForm(forms.ModelForm):
+    class Meta:
+        model = models.Groupie
+        fields = '__all__'
+        widgets = {
+            'obsession': ArtistCustomTitleWidget
+        }
@@ -1,34 +1,62 @@
-# -*- coding:utf-8 -*-
-from __future__ import absolute_import, unicode_literals
-
 from django.db import models
-from django.utils.encoding import python_2_unicode_compatible


-@python_2_unicode_compatible
 class Genre(models.Model):
    title = models.CharField(max_length=50)

+    class Meta:
+        ordering = ('title',)
+
    def __str__(self):
        return self.title


-@python_2_unicode_compatible
 class Artist(models.Model):
-    title = models.CharField(max_length=50)
+    title = models.CharField(max_length=50, unique=True)
    genres = models.ManyToManyField(Genre)

+    class Meta:
+        ordering = ('title',)
+
    def __str__(self):
        return self.title


-@python_2_unicode_compatible
 class Album(models.Model):
    title = models.CharField(max_length=255)
-    artist = models.ForeignKey(Artist)
+    artist = models.ForeignKey(Artist, on_delete=models.CASCADE)
    featured_artists = models.ManyToManyField(Artist, blank=True, related_name='featured_album_set')
-    primary_genre = models.ForeignKey(Genre, blank=True, null=True, related_name='primary_album_set')
+    primary_genre = models.ForeignKey(Genre, on_delete=models.CASCADE, blank=True, null=True,
+                                      related_name='primary_album_set')
    genres = models.ManyToManyField(Genre)

+    class Meta:
+        ordering = ('title',)
+
    def __str__(self):
        return self.title
+
+
+class Country(models.Model):
+    name = models.CharField(max_length=255)
+
+    class Meta:
+        ordering = ('name',)
+
+    def __str__(self):
+        return self.name
+
+
+class City(models.Model):
+    name = models.CharField(max_length=255)
+    country = models.ForeignKey('Country', related_name="cities", on_delete=models.CASCADE)
+
+    class Meta:
+        ordering = ('name',)
+
+    def __str__(self):
+        return self.name
+
+
+class Groupie(models.Model):
+    obsession = models.ForeignKey(Artist, to_field='title', on_delete=models.CASCADE)
@@ -20,7 +20,7 @@ INSTALLED_APPS = (
    'tests.testapp',
 )

-MIDDLEWARE_CLASSES = (
+MIDDLEWARE = (
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
@@ -33,18 +33,31 @@ MEDIA_ROOT = os.path.join(BASE_DIR, 'media')
 SITE_ID = 1
 ROOT_URLCONF = 'tests.testapp.urls'

-TEMPLATE_DIRS = (
-    os.path.join(BASE_DIR, "templates"),
-)
+LANGUAGES = [
+    ('de', 'German'),
+    ('en', 'English'),
+]
+
+TEMPLATES = [
+    {
+        'BACKEND': 'django.template.backends.django.DjangoTemplates',
+        'APP_DIRS': True,
+        'DIRS': ['templates'],
+    },
+]

 SECRET_KEY = '123456'

 USE_L10N = True
+USE_I18N = True

 if os.environ.get('TRAVIS'):
    CACHES = {
-        'default': {
-            'BACKEND': 'django.core.cache.backends.memcached.MemcachedCache',
-            'LOCATION': 'localhost:11211',
+        "default": {
+            "BACKEND": "django_redis.cache.RedisCache",
+            "LOCATION": "redis://127.0.0.1:6379/1",
+            "OPTIONS": {
+                "CLIENT_CLASS": "django_redis.client.DefaultClient",
+            }
        }
    }
@@ -15,11 +15,11 @@
  {{ form }}
  <input type="submit" value="Submit Form"/>
 </form>
-<script src="{% static '//code.jquery.com/jquery-2.1.4.min.js' %}"></script>
+<script src="//code.jquery.com/jquery-2.1.4.min.js"></script>
 <script type="text/javascript">
  window.onerror = function (msg) {
    $("body").attr("JSError", msg);
  }
 </script>
 {{ form.media.js }}
-</body>
+</body>
@@ -1,22 +1,19 @@
-# -*- conding:utf-8 -*-
-from __future__ import absolute_import, unicode_literals
-
-from django.conf.urls import include, patterns, url
+from django.conf.urls import include, url

 from .forms import (
-    AlbumModelSelect2WidgetForm, HeavySelect2MultipleWidgetForm,
-    HeavySelect2WidgetForm, ModelSelect2TagWidgetForm, Select2WidgetForm
+    AddressChainedSelect2WidgetForm, AlbumModelSelect2WidgetForm,
+    HeavySelect2MultipleWidgetForm, HeavySelect2WidgetForm,
+    ModelSelect2TagWidgetForm, Select2WidgetForm
 )
-from .views import TemplateFormView, heavy_data
+from .views import TemplateFormView, heavy_data_1, heavy_data_2

-urlpatterns = patterns(
-    '',
+urlpatterns = [
    url(r'^select2_widget/$',
        TemplateFormView.as_view(form_class=Select2WidgetForm), name='select2_widget'),
    url(r'^heavy_select2_widget/$',
        TemplateFormView.as_view(form_class=HeavySelect2WidgetForm), name='heavy_select2_widget'),
    url(r'^heavy_select2_multiple_widget/$',
-        TemplateFormView.as_view(form_class=HeavySelect2MultipleWidgetForm),
+        TemplateFormView.as_view(form_class=HeavySelect2MultipleWidgetForm, success_url='/'),
        name='heavy_select2_multiple_widget'),

    url(r'^model_select2_widget/$',
@@ -27,7 +24,12 @@ urlpatterns = patterns(
        TemplateFormView.as_view(form_class=ModelSelect2TagWidgetForm),
        name='model_select2_tag_widget'),

-    url(r'^heavy_data/$', heavy_data, name='heavy_data'),
+    url(r'^model_chained_select2_widget/$',
+        TemplateFormView.as_view(form_class=AddressChainedSelect2WidgetForm),
+        name='model_chained_select2_widget'),
+
+    url(r'^heavy_data_1/$', heavy_data_1, name='heavy_data_1'),
+    url(r'^heavy_data_2/$', heavy_data_2, name='heavy_data_2'),

    url(r'^select2/', include('django_select2.urls')),
-)
+]
@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
 import json

 from django.http import HttpResponse
@@ -11,7 +8,17 @@ class TemplateFormView(FormView):
    template_name = 'form.html'


-def heavy_data(request):
+def heavy_data_1(request):
+    term = request.GET.get("term", "")
    numbers = ['Zero', 'One', 'Two', 'Three', 'Four', 'Five']
+    numbers = filter(lambda num: term.lower() in num.lower(), numbers)
+    results = [{'id': index, 'text': value} for (index, value) in enumerate(numbers)]
+    return HttpResponse(json.dumps({'err': 'nil', 'results': results}), content_type='application/json')
+
+
+def heavy_data_2(request):
+    term = request.GET.get("term", "")
+    numbers = ['Six', 'Seven', 'Eight', 'Nine', 'Ten', 'Fortytwo']
+    numbers = filter(lambda num: term.lower() in num.lower(), numbers)
    results = [{'id': index, 'text': value} for (index, value) in enumerate(numbers)]
    return HttpResponse(json.dumps({'err': 'nil', 'results': results}), content_type='application/json')
@@ -0,0 +1,33 @@
+[tox]
+envlist = py{36}-dj{111,20,master},qa,docs
+[testenv]
+setenv=
+    PYTHONPATH = {toxinidir}
+passenv=CI
+deps=
+    -rrequirements-dev.txt
+    dj111: https://github.com/django/django/archive/stable/1.11.x.tar.gz#egg=django
+    dj20: https://github.com/django/django/archive/stable/2.0.x.tar.gz#egg=django
+    djmaster: https://github.com/django/django/archive/master.tar.gz#egg=django
+commands=
+    coverage run --source=django_select2 -m 'pytest' \
+        --basetemp={envtmpdir} \
+        --ignore=.tox \
+        {posargs}
+
+[testenv:qa]
+changedir={toxinidir}
+deps=
+    -rrequirements-dev.txt
+commands=
+    isort --check-only --recursive --diff {posargs}
+    flake8 --jobs=2 {posargs}
+    pydocstyle --verbose --explain --source --count {posargs}
+
+[testenv:docs]
+whitelist_externals=make
+changedir={toxinidir}/docs
+deps=
+    -rrequirements-dev.txt
+    https://github.com/django/django/archive/stable/1.11.x.tar.gz#egg=django
+commands=make spelling