ManyToManyField.db_constraint
Controls whether or not constraints should be created in the database for the foreign keys in the intermediary table. The default is True, and that’s almost certainly what you want; setting this to False can be very bad for data integrity. That said, here are some scenarios where you might want to do this:
- You have legacy data that is not valid.
- You’re sharding your database.
It is an error to pass both db_constraint and through.
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