Ticket #18097: fix_queryset_contains.diff

django/db/models/query.py

@@ -155 +155 @@
         while True:
             if len(self._result_cache) <= pos:
                 self._fill_cache(num=1)
+            if self._result_cache[pos] == val:
+                return True
             if self._iter is None:
                 # we ran out of items
                 return False
-            if self._result_cache[pos] == val:
-                return True
             pos += 1
 
     def __getitem__(self, k):