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 18889,Provide a simple way to retain parent instances after children are deleted,anonymous,nobody,"I have a Location table with two children (using table-inheritance): Restaurant and ChipShop. There should be a simple way to convert a ChipShop to a Restaurant without deleting/recreating the Location which may be referenced by lots of foreign keys, e.g: {{{ location = Location.objects.get(1) # Currently a ChipShop restaurant = Restaurant(location_ptr=location) restaurant.save() location.chipshop.delete() # Deletes the ChipShop row but not the Location }}} Currently this can be achieved by using raw sql to bypass django's code that deletes the parent when a child is deleted. Doing the following does not work as the parent is still deleted, perhaps this is a bug? {{{ class ChipShop(Location); location_ptr = models.OneToOneField(Location, on_delete=DO_NOTHING, parent_link=True) }}} Modifying the on_delete of the created location_ptr does nothing as well. Perhaps a setting in the parents Meta that could be used to specify that the parent should not be deleted when the child is?",New feature,closed,"Database layer (models, ORM)",dev,Normal,duplicate,,ionel.mc@… charette.s@…,Accepted,0,0,0,0,0,0