Fix SearchFilter to-many behavior by ANDing cond's

rest_framework/filters.py

@@ -140,12 +140,14 @@ class SearchFilter(BaseFilterBackend):
         ]
 
         base = queryset
+        conditions = []
         for search_term in search_terms:
             queries = [
                 models.Q(**{orm_lookup: search_term})
                 for orm_lookup in orm_lookups
             ]
-            queryset = queryset.filter(reduce(operator.or_, queries))
+            conditions.append(reduce(operator.or_, queries))
+        queryset = queryset.filter(reduce(operator.and_, conditions))
 
         if self.must_call_distinct(queryset, search_fields):
             # Filtering against a many-to-many field requires us to

tests/test_filters.py

@@ -5,6 +5,7 @@ import unittest
 import warnings
 from decimal import Decimal
 
+import django
 import pytest
 from django.conf.urls import url
 from django.core.exceptions import ImproperlyConfigured
@@ -668,12 +669,15 @@ class SearchFilterToManyTests(TestCase):
         b1 = Blog.objects.create(name='Blog 1')
         b2 = Blog.objects.create(name='Blog 2')
 
+        # Multiple entries on Lennon published in 1979 - distinct should deduplicate
         Entry.objects.create(blog=b1, headline='Something about Lennon', pub_date=datetime.date(1979, 1, 1))
         Entry.objects.create(blog=b1, headline='Another thing about Lennon', pub_date=datetime.date(1979, 6, 1))
 
+        # Entry on Lennon *and* a separate entry in 1979 - should not match
         Entry.objects.create(blog=b2, headline='Something unrelated', pub_date=datetime.date(1979, 1, 1))
         Entry.objects.create(blog=b2, headline='Retrospective on Lennon', pub_date=datetime.date(1990, 6, 1))
 
+    @unittest.skipIf(django.VERSION < (1, 9), "Django 1.8 does not support transforms")
     def test_multiple_filter_conditions(self):
         class SearchListView(generics.ListAPIView):
             queryset = Blog.objects.all()