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 19544 IntegrityError during ManyToMany add() on Oracle or for user-defined through relationships. German M. Bravo "I'm frequently getting this exception (""IntegrityError: duplicate key value violates unique constraint..."") a lot in my production server when I do `add()` on a Many To Many relationship. For what I've seen, there seems to be a race condition in `django.db.models.fields.related`'s `ManyRelatedManager._add_items()` between the point `new_ids` is ""calculated"" and the point `bulk_create()` actually creates the tuples in the database. " Cleanup/optimization new Database layer (models, ORM) dev Normal German M. Bravo jon.dufresne@… Дилян Палаузов Simon Charette Florian Demmer Accepted 0 0 0 0 0 0