Copy DjangoFilterBackend from DRF

django_filters/compat.py

@@ -2,6 +2,13 @@
 import django
 
 
+# django-crispy-forms is optional
+try:
+    import crispy_forms
+except ImportError:
+    crispy_forms = None
+
+
 def remote_field(field):
     """
     https://docs.djangoproject.com/en/1.9/releases/1.9/#field-rel-changes

django_filters/rest_framework/__init__.py

@@ -1,4 +1,5 @@
 # flake8: noqa
 from __future__ import absolute_import
+from .backends import DjangoFilterBackend
 from .filterset import FilterSet
 from ..filters import *

django_filters/rest_framework/backends.py

@@ -0,0 +1,95 @@
+
+from __future__ import absolute_import
+
+from django.conf import settings
+from django.template import loader
+from django.utils.translation import ugettext_lazy as _
+
+from rest_framework import compat
+from rest_framework.filters import BaseFilterBackend
+
+from ..compat import crispy_forms
+from . import filterset
+
+
+if 'crispy_forms' in settings.INSTALLED_APPS and crispy_forms:
+    from crispy_forms.helper import FormHelper
+    from crispy_forms.layout import Layout, Submit
+
+    class FilterSet(filterset.FilterSet):
+        def __init__(self, *args, **kwargs):
+            super(FilterSet, self).__init__(*args, **kwargs)
+            for field in self.form.fields.values():
+                field.help_text = None
+
+            layout_components = list(self.form.fields.keys()) + [
+                Submit('', _('Submit'), css_class='btn-default'),
+            ]
+
+            helper = FormHelper()
+            helper.form_method = 'GET'
+            helper.template_pack = 'bootstrap3'
+            helper.layout = Layout(*layout_components)
+
+            self.form.helper = helper
+
+    filter_template = 'django_filters/rest_framework/crispy_form.html'
+
+else:
+    class FilterSet(filterset.FilterSet):
+        def __init__(self, *args, **kwargs):
+            super(FilterSet, self).__init__(*args, **kwargs)
+            for field in self.form.fields.values():
+                field.help_text = None
+
+    filter_template = 'django_filters/rest_framework/form.html'
+
+
+class DjangoFilterBackend(BaseFilterBackend):
+    default_filter_set = FilterSet
+    template = filter_template
+
+    def get_filter_class(self, view, queryset=None):
+        """
+        Return the django-filters `FilterSet` used to filter the queryset.
+        """
+        filter_class = getattr(view, 'filter_class', None)
+        filter_fields = getattr(view, 'filter_fields', None)
+
+        if filter_class:
+            filter_model = filter_class.Meta.model
+
+            assert issubclass(queryset.model, filter_model), \
+                'FilterSet model %s does not match queryset model %s' % \
+                (filter_model, queryset.model)
+
+            return filter_class
+
+        if filter_fields:
+            class AutoFilterSet(self.default_filter_set):
+                class Meta:
+                    model = queryset.model
+                    fields = filter_fields
+
+            return AutoFilterSet
+
+        return None
+
+    def filter_queryset(self, request, queryset, view):
+        filter_class = self.get_filter_class(view, queryset)
+
+        if filter_class:
+            return filter_class(request.query_params, queryset=queryset).qs
+
+        return queryset
+
+    def to_html(self, request, queryset, view):
+        filter_class = self.get_filter_class(view, queryset)
+        if not filter_class:
+            return None
+        filter_instance = filter_class(request.query_params, queryset=queryset)
+        context = {
+            'filter': filter_instance
+        }
+        template = loader.get_template(self.template)
+        return compat.template_render(template, context)

django_filters/rest_framework/templates/django_filters/rest_framework/crispy_form.html

@@ -0,0 +1,5 @@
+{% load crispy_forms_tags %}
+{% load i18n %}
+
+<h2>{% trans "Field filters" %}</h2>
+{% crispy filter.form %}

django_filters/rest_framework/templates/django_filters/rest_framework/form.html

@@ -0,0 +1,6 @@
+{% load i18n %}
+<h2>{% trans "Field filters" %}</h2>
+<form class="form" action="" method="get">
+    {{ filter.form.as_p }}
+    <button type="submit" class="btn btn-primary">{% trans "Submit" %}</button>
+</form>

tests/rest_framework/models.py

@@ -0,0 +1,28 @@
+
+from django.db import models
+from django.utils.translation import ugettext_lazy as _
+
+
+class BasicModel(models.Model):
+    text = models.CharField(
+        max_length=100,
+        verbose_name=_("Text comes here"),
+        help_text=_("Text description.")
+    )
+
+
+class BaseFilterableItem(models.Model):
+    text = models.CharField(max_length=100)
+
+
+class FilterableItem(BaseFilterableItem):
+    decimal = models.DecimalField(max_digits=4, decimal_places=2)
+    date = models.DateField()
+
+
+class DjangoFilterOrderingModel(models.Model):
+    date = models.DateField()
+    text = models.CharField(max_length=10)
+
+    class Meta:
+        ordering = ['-date']