Ticket #4399: 5358_added_nonzero_for_queryset.diff

django/db/models/query.py

@@ -164 +164 @@
         combined._filters = self._filters | other._filters
         return combined
 
+    def __nonzero__(self):
+        """
+        Returns True if an element exists.
+        """
+        return len(self.values(self.model._meta.pk.name)[:1]) > 0
+
     ####################################
     # METHODS THAT DO DATABASE QUERIES #
     ####################################