I would like to have a delete-orphan cascade rule, so that I can delete the
children of a post when it gets deleted. I set up the mapper like this:
cls.mapper=db.mapper(cls,table,is_primary=True,properties={
'kits': db.relation(Post,cascade='all, delete-orphan')
})
where cls is my post class, and db is sqlalchemy. Ok... this is the error:
ArgumentError: Cant establish 'delete-orphan' cascade rule on a
self-referential relationship (attribute 'kits' on class 'Post'). You probably
want cascade='all', which includes delete cascading but not orphan detection.
But...
http://www.sqlalchemy.org/docs/adv_datamapping.myt#advdatamapping_recursive
That example right there establishes delete-orphan on a self referential
relationship. Is it outdated? If I were a post, must I manually recurse
through all my kits before deleting myself? I'll leave off the delete-orphan
part for now, and manually recurse, but it does seem curious to see such an
error.
-------------------------------------------------------------------------
Take Surveys. Earn Cash. Influence the Future of IT
Join SourceForge.net's Techsay panel and you'll get the chance to share your
opinions on IT & business topics through brief surveys -- and earn cash
http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
_______________________________________________
Sqlalchemy-users mailing list
Sqlalchemy-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/sqlalchemy-users
