Query.one() raises either NoResultFound or MultipleResultsFound, [ticket:1034]

1 files changed, 5 insertions, 0 deletions

diff --git a/lib/sqlalchemy/orm/exc.py b/lib/sqlalchemy/orm/exc.py
index 2d1d2b108..ea7efd3fb 100644
--- a/lib/sqlalchemy/orm/exc.py
+++ b/lib/sqlalchemy/orm/exc.py
@@ -24,6 +24,11 @@ class ObjectDeletedError(sa_exc.InvalidRequestError):
 class UnmappedColumnError(sa_exc.InvalidRequestError):
     """Mapping operation was requested on an unknown column."""
 
+class NoResultFound(sa_exc.InvalidRequestError):
+    """A database result was required but none was found."""
+
+class MultipleResultsFound(sa_exc.InvalidRequestError):
+    """A single database result was required but more than one were found."""
 
 # Legacy compat until 0.6.
 sa_exc.ConcurrentModificationError = ConcurrentModificationError