diff options
Diffstat (limited to 'lib/sqlalchemy/orm/properties.py')
| -rw-r--r-- | lib/sqlalchemy/orm/properties.py | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/lib/sqlalchemy/orm/properties.py b/lib/sqlalchemy/orm/properties.py index a0d8c92d1..79a1b81d3 100644 --- a/lib/sqlalchemy/orm/properties.py +++ b/lib/sqlalchemy/orm/properties.py @@ -816,7 +816,10 @@ class RelationshipProperty(StrategizedProperty): adapt_source=adapt_source) def __str__(self): - return str(self.parent.class_.__name__) + "." + self.key + if self.parent: + return str(self.parent.class_.__name__) + "." + self.key + else: + return "." + self.key def merge(self, session, @@ -1201,11 +1204,15 @@ class RelationshipProperty(StrategizedProperty): else: backref_key, kwargs = self.backref mapper = self.mapper.primary_mapper() - if mapper.has_property(backref_key): - raise sa_exc.ArgumentError("Error creating backref " - "'%s' on relationship '%s': property of that " - "name exists on mapper '%s'" % (backref_key, - self, mapper)) + + check = set(mapper.iterate_to_root()).\ + union(mapper.self_and_descendants) + for m in check: + if m.has_property(backref_key): + raise sa_exc.ArgumentError("Error creating backref " + "'%s' on relationship '%s': property of that " + "name exists on mapper '%s'" % (backref_key, + self, m)) # determine primaryjoin/secondaryjoin for the # backref. Use the one we had, so that |