Fixed #17335 -- Added supports_select_related hook for django-nonrel.…

… Thanks, jonash

git-svn-id: http://code.djangoproject.com/svn/django/trunk@17170 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/backends/__init__.py

@@ -313,6 +313,8 @@ class BaseDatabaseFeatures(object):
     has_select_for_update = False
     has_select_for_update_nowait = False
 
+    supports_select_related = True
+
     # Does the default test database allow multiple connections?
     # Usually an indication that the test database is in-memory
     test_db_allows_multiple_connections = True

django/db/models/query.py

@@ -232,7 +232,9 @@ def iterator(self):
         An iterator over the results from applying this QuerySet to the
         database.
         """
-        fill_cache = self.query.select_related
+        fill_cache = False
+        if connections[self.db].features.supports_select_related:
+            fill_cache = self.query.select_related
         if isinstance(fill_cache, dict):
             requested = fill_cache
         else: