further fixes for column/table errors

1 files changed, 7 insertions, 0 deletions

diff --git a/lib/sqlalchemy/exc.py b/lib/sqlalchemy/exc.py
index 4ce0bfe7f..4f776b837 100644
--- a/lib/sqlalchemy/exc.py
+++ b/lib/sqlalchemy/exc.py
@@ -102,6 +102,9 @@ class NoReferencedTableError(NoReferenceError):
         NoReferenceError.__init__(self, message)
         self.table_name = tname
 
+    def __reduce__(self):
+        return self.__class__, (self.args[0], self.table_name)
+
 class NoReferencedColumnError(NoReferenceError):
     """Raised by ``ForeignKey`` when the referred ``Column`` cannot be located."""
 
@@ -110,6 +113,10 @@ class NoReferencedColumnError(NoReferenceError):
         self.table_name = tname
         self.column_name = cname
 
+    def __reduce__(self):
+        return self.__class__, (self.args[0], self.table_name, 
+                            self.column_name)
+
 class NoSuchTableError(InvalidRequestError):
     """Table does not exist or is not visible to a connection."""