id summary reporter owner description type status component version severity resolution keywords cc stage has_patch needs_docs needs_tests needs_better_patch easy ui_ux 12899 Explicitly allow to keep alive objects after deleting related ForeignKey object instance Alexey Kinyov nobody "Sometimes relation between objects needs to be 'weak': on deleting 'parent' object we should define some 'fallback' keeping 'children' instanses alive. It would look like this: {{{ #!python class MyModel(Model): user = ForeignKey(User, blank=True, null=True, weak=True) }}} or {{{ #!python def get_or_create_default_user(instance): # some project specific logic here to define # default user for MyModel instace # ... return user class MyModel(Model): user = ForeignKey(User, default=get_or_create_default_user, weak=True) }}} This will help prevent tricks with signal 'pre_delete' #6870. Suggested processing of 'weak' relation: just before deleting 'parent' all related 'weak' relations must be set to default. If 'parent' is the same as default, then deleting of related objects will occur anyway. If not, related objects will survive :) " closed Database layer (models, ORM) 1.2-beta duplicate foreignkey, relations Unreviewed 0 0 0 0 0 0