On Mar 29, 6:15 pm, Michael Bayer <mike...@zzzcomputing.com> wrote: > you want the delete to fail if there *are* users associated or if there are > *not* ? for the "raise an error if users exist", the most efficient and > generic way is to ensure the foreign key on UserGroup is not nullable and > "delete" cascade isn't used. if you wanted to dig an assertion into the > mapper you could use a before_delete() extension.
As you guessed, the case I was anticipating was "raise an error if users exist". I'll look into setting a non-nullable column. Thanks a bunch for the help. -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalch...@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
