Ticket #10300: 10300.diff

django/db/models/fields/files.py

@@ -65 +65 @@
 
     def _get_size(self):
         self._require_file()
-        return self.storage.size(self.name)
+        if self._committed:
+            return self.storage.size(self.name)
+        else:
+            return super(FieldFile, self).size
     size = property(_get_size)
 
     def open(self, mode='rb'):