[patch] Fix deleting objects with generic relation
|Reported by:||Alex Dedul||Owned by:||Adrian Holovaty|
|Component:||Database layer (models, ORM)||Version:|
|Has patch:||yes||Needs documentation:||no|
|Needs tests:||no||Patch needs improvement:||no|
When you have generic relation in a model and you do model_obj.delete() from generic related table deleted all records with object_id = model_obj.id - that is incorrect. Correct condition for deletion should be "object_id = model_obj.id AND content_type = content_type(model_obj)" (in pseudo code). Also this patch fixes deletion of a model with generic foreign key(i.e. model referenced by generic relation) - current behavior is to try to delete records from m2m generic relations, but there is no m2m tables created for generic relations so there is no need to delete anything in this case - this also fixes issues mentioned in #2749 with deletion of both records.
Attached patch fixes all these issues.