> -----Original Message----- > From: sqlalchemy@googlegroups.com > [mailto:[EMAIL PROTECTED] On Behalf Of Randy Syring > Sent: 30 September 2008 07:17 > To: sqlalchemy > Subject: [sqlalchemy] Re: How to turn off UPDATE on child > objects when deleting parent object > > On Sep 30, 2:14 am, Randy Syring <[EMAIL PROTECTED]> wrote: > > More details are > here:http://groups.google.com/group/sqlelixir/browse_thread/th > read/aac5d22... > > > > But basically, I have a relationship between a parent > (Item) table and > > child (Link) table. When I try to delete an Item, an SQL > statement is > > generated by SQLAlchemy that tries to set Link.item_id = NULL. That > > is invalid, because Link.item_id is a NOT NULL column and > also because > > I have a FK on the column. I have tried adjusting the > cascade options > > to no avail. > > > > Sorry, one follow-up. I can actually get this to work by setting > cascade='all, delete-orphan'. But since the FK will do a cascading > delete, it is slower for SQLAlchemy to have to issue the statements. > Can I just make SQLAlchemy not issue anything when deleting the > parent? >
I think you need the 'passive_deletes' flag to tell SQLAlchemy that the database will delete child objects for you. It is described here: http://www.sqlalchemy.org/docs/05/mappers.html#advdatamapping_relation_largecollections_passivedelete Hope that helps, Simon --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
