Ticket #3541: faster_count.patch

django/db/models/query.py

@@ -194 +194 @@
                 yield obj
 
     def count(self):
-        "Performs a SELECT COUNT() and returns the number of records as an integer."
+        """
+        Returns the number of records as an integer.
+        
+        If _result_cache has been loaded, do len(self._result_cache)
+        otherwise perform a SELECT COUNT().
+        """
+        if self._result_cache is not None:
+            return len(self._result_cache)
+        
         counter = self._clone()
         counter._order_by = ()
         counter._select_related = False