From bc359782fdc298044d9da0af0081b53c70ee7a2c Mon Sep 17 00:00:00 2001
From: Ryan P Kilby <rpkilby@ncsu.edu>
Date: Sun, 16 Oct 2016 19:13:12 -0400
Subject: [PATCH] Add coreapi/DRF compatibility

---
 django_filters/compat.py                  | 9 +++++++++
 django_filters/rest_framework/backends.py | 6 +++---
 tests/rest_framework/test_backends.py     | 5 ++---
 3 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/django_filters/compat.py b/django_filters/compat.py
index e7fa88b..cbac451 100644
--- a/django_filters/compat.py
+++ b/django_filters/compat.py
@@ -1,4 +1,6 @@
 
+from __future__ import absolute_import
+
 import django
 from django.conf import settings
 
@@ -12,6 +14,13 @@ except ImportError:
 is_crispy = 'crispy_forms' in settings.INSTALLED_APPS and crispy_forms
 
 
+# coreapi only compatible with DRF 3.4+
+try:
+    from rest_framework.compat import coreapi
+except ImportError:
+    coreapi = None
+
+
 def remote_field(field):
     """
     https://docs.djangoproject.com/en/1.9/releases/1.9/#field-rel-changes
diff --git a/django_filters/rest_framework/backends.py b/django_filters/rest_framework/backends.py
index eefc5fe..37c7dfa 100644
--- a/django_filters/rest_framework/backends.py
+++ b/django_filters/rest_framework/backends.py
@@ -2,7 +2,7 @@
 from __future__ import absolute_import
 
 from django.template import Template, TemplateDoesNotExist, loader
-from rest_framework.compat import coreapi, template_render
+from rest_framework.compat import template_render
 from rest_framework.filters import BaseFilterBackend
 
 from .. import compat
@@ -94,10 +94,10 @@ class DjangoFilterBackend(BaseFilterBackend):
         # This is not compatible with widgets where the query param differs from the
         # filter's attribute name. Notably, this includes `MultiWidget`, where query
         # params will be of the format `<name>_0`, `<name>_1`, etc...
-        assert coreapi is not None, 'coreapi must be installed to use `get_schema_fields()`'
+        assert compat.coreapi is not None, 'coreapi must be installed to use `get_schema_fields()`'
         filter_class = self.get_filter_class(view, view.get_queryset())
 
         return [] if not filter_class else [
-            coreapi.Field(name=field_name, required=False, location='query')
+            compat.coreapi.Field(name=field_name, required=False, location='query')
             for field_name in filter_class().filters.keys()
         ]
diff --git a/tests/rest_framework/test_backends.py b/tests/rest_framework/test_backends.py
index 496eecd..763d093 100644
--- a/tests/rest_framework/test_backends.py
+++ b/tests/rest_framework/test_backends.py
@@ -16,10 +16,9 @@ except ImportError:
     from django.core.urlresolvers import reverse
 
 from rest_framework import generics, serializers, status
-from rest_framework.compat import coreapi
 from rest_framework.test import APIRequestFactory
 
-from django_filters import filters
+from django_filters import compat, filters
 from django_filters.rest_framework import DjangoFilterBackend, FilterSet
 from django_filters.rest_framework import backends
 
@@ -123,7 +122,7 @@ urlpatterns = [
 ]
 
 
-@skipIf(coreapi is None, 'coreapi must be installed')
+@skipIf(compat.coreapi is None, 'coreapi must be installed')
 class GetSchemaFieldsTests(TestCase):
     def test_fields_with_filter_fields_list(self):
         backend = DjangoFilterBackend()