youd need to add some "delete" cascades to your relationship, maybe on just the backref (using the backref() function), e.g.
option_mapper = assign_mapper(ctx, Option, option_table, properties={ 'sites':relation(Site, backref=backref("options", cascade="save-update, delete"), secondary=options_has_sites, cascade="save-update"), }, order_by=option_table.c.name, ) On Mar 16, 2007, at 10:38 AM, Alexandre CONRAD wrote: > > Hello, > > I have a many-to-many relation between an option table and a site > table. > > Deleting an option correctly deletes the related rows in > "options_has_sites" table. > > But when I delete a site, I have some orphan rows in the > "options_has_sites" table. How can I avoid this ? > > > # SITE TABLE ----------- > site_table = Table('sites', meta, > Column('id', Integer, primary_key=True), > Column('name', Unicode(20), nullable=False, unique=True), > ) > > class Site(object): > pass > > site_mapper = assign_mapper(ctx, Site, site_table, > order_by=site_table.c.name, > ) > > > # OPTION TABLE ------------ > option_table = Table('options', meta, > Column('id', Integer, primary_key=True), > Column('name', Unicode(20), unique=True, nullable=False), > ) > > options_has_sites = Table('sites_has_options', meta, > Column('id_site', None, ForeignKey('sites.id'), > primary_key=True), > Column('id_option', None, ForeignKey('options.id'), > primary_key=True), > ) > > class Option(object): > pass > > option_mapper = assign_mapper(ctx, Option, option_table, > properties={ > 'sites':relation(Site, backref="options", > secondary=options_has_sites, cascade="save-update"), > }, > order_by=option_table.c.name, > ) > > > Should I play with backref() ? > > Regards, > -- > Alexandre CONRAD > > > > --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---