Add compatibility with older django/python versions

rest_framework/filters.py

@@ -96,6 +96,10 @@ class SearchFilter(BaseFilterBackend):
                     if hasattr(field, "path_infos"):
                         # Update opts to follow the relation.
                         opts = field.path_infos[-1].to_opts
+                    # django < 4.1
+                    elif hasattr(field, 'get_path_info'):
+                        # Update opts to follow the relation.
+                        opts = field.get_path_info()[-1].to_opts
             # Otherwise, use the field with icontains.
             lookup = 'icontains'
         return LOOKUP_SEP.join([field_name, lookup])

tests/test_filters.py

@@ -182,7 +182,6 @@ class SearchFilterTests(TestCase):
 
         request = factory.get('/', {'search': r'^\w{3}$', 'title_only': 'true'})
         response = view(request)
-        print(response.data)
         assert response.data == [
             {'id': 3, 'title': 'zzz', 'text': 'cde'}
         ]