refactor compiler.

Author: WaVEV

django_mongodb/compiler.py

@@ -224,6 +224,10 @@ def _get_ordering(self):
     def collection_name(self):
         return self.query.get_meta().db_table
 
+    @cached_property
+    def collection_name(self):
+        return self.query.get_meta().db_table
+
     def get_collection(self):
         return self.connection.get_collection(self.collection_name)