http://code.djangoproject.com/ticket/7539 suggests a way to add On Delete and On Update support to Django foreign key fields, and includes a patch that implements the suggestions. At the time I submitted it, getting Django 1.1 out the door prevented it from being seriously considered, but now that 1.2 is in the planning stages, how about it?
The ticket actually suggests several changes: 1) Adding an on_delete parameter to ForeignKey definitions and allowing it to specify CASCADE, SET_NULL, or RESTRICT behavior. 2) Modifying Django's built-in behavior, which currently always cascades deletes, to handle the new SET_NULL and RESTRICT behaviors. Django still defaults to CASCADE behavior for foreign keys that don't specify an on_delete parameter. 3) Allowing settings files to change the default on delete behavior from CASCADE to one of the other options for foreign keys that don't specify an on_delete parameter. 4) Allowing settings files to specify that the on_delete behavior should be handled by the database backend rather than by Django, and changing the SQL generated by Django to contain appropriate ON DELETE clauses. 5) Adding an on_update parameter to ForeignKey definitions. Unlike the on_delete parameter, the patch doesn't implement built-in emulation of on_update: on_update clauses are only handled by the database backend. I believe that items 1-3 are in a form that is usable with little modification, and would like to suggest that at least this much be added to 1.2. Items 4 and 5 would need more work to support more back ends before it makes sense to include them. It might also be nice to have an implementation of item 5 that doesn't depend on the db backend, although this might require a significant amount of work. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~----------~----~----~----~------~----~------~--~---
