From: Mike Bayer <mike_mp@zzzcomputing.com>
Date: Fri, 6 Oct 2006 15:34:08 +0000 (+0000)
Subject: better error message for unconnected DynamicMetaData [ticket:326]
X-Git-Tag: rel_0_3_0~82
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f7f1426dab2bf8789b4de4ad0f284d4c132f4467;p=thirdparty%2Fsqlalchemy%2Fsqlalchemy.git

better error message for unconnected DynamicMetaData [ticket:326]
---

diff --git a/lib/sqlalchemy/schema.py b/lib/sqlalchemy/schema.py
index 72109379d7..4c7d15c638 100644
--- a/lib/sqlalchemy/schema.py
+++ b/lib/sqlalchemy/schema.py
@@ -983,7 +983,12 @@ class DynamicMetaData(MetaData):
         """disposes all Engines to which this DynamicMetaData has been connected."""
         for e in self.__engines.values():
             e.dispose()
-    engine=property(lambda s:hasattr(s.context, '_engine') and s.context._engine or None)
+    def _get_engine(self):
+        if hasattr(self.context, '_engine'):
+            return self.context._engine
+        else:
+            raise exceptions.InvalidRequestError("This DynamicMetaData is not connected to any engine")
+    engine=property(_get_engine)
             
 class SchemaVisitor(sql.ClauseVisitor):
     """defines the visiting for SchemaItem objects"""