diff options
Diffstat (limited to 'lib/sqlalchemy/orm/dependency.py')
| -rw-r--r-- | lib/sqlalchemy/orm/dependency.py | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/lib/sqlalchemy/orm/dependency.py b/lib/sqlalchemy/orm/dependency.py index 023b3e07e..44858fb85 100644 --- a/lib/sqlalchemy/orm/dependency.py +++ b/lib/sqlalchemy/orm/dependency.py @@ -268,9 +268,15 @@ class DependencyProcessor(object): }) else: raise exc.FlushError( - "Attempting to flush an item of type %s on collection '%s', " - "whose mapper does not inherit from that of %s." % - (state.class_, self.prop, self.mapper.class_)) + 'Attempting to flush an item of type ' + '%(x)s as a member of collection ' + '"%(y)s". Expected an object of type ' + '%(z)s or a polymorphic subclass of ' + 'this type.' % { + 'x': state.class_, + 'y': self.prop, + 'z': self.mapper.class_, + }) def _synchronize(self, state, child, associationrow, clearkeys, uowcommit): |