Hi, I have two tables: Image and PersistentImage, where the latter inherits the former. In addition, PersistentImage has a foreign key to itself (ie, all PersistentImage objects form a hierarchy among themselves). I haven't been able to get this to work - first it complained about wanting a primaryjoin, then it seemed to get confused between the parent/children relation among PersistentImage objects and the inheritance between PersistentImage and Image. Here are my mappers:
mapper( Image, imageTable, polymorphic_on=imageTable.c.type, polymorphic_identity='Image' ) mapper( PersistentImage, persistentImageTable, inherits=Image, polymorphic_identity='PersistentImage', properties={ 'children': relation(PersistentImage, backref='parent') }) And here are the actual table definitions: imageTable = Table('Images', metadata, Column('id', Integer, primary_key=True), Column('name', String(256), nullable=False), Column('type', String(30), nullable=False) ) persistentImageTable = Table('PersistentImages', metadata, Column('id', Integer, ForeignKey('Images.id'), primary_key=True), Column('parentId', Integer, ForeignKey('PersistentImages.id')), Column('userId', Integer, ForeignKey('Users.id'), nullable=False) ) Thanks! --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---