Options.unique_together
Sets of field names that, taken together, must be unique:
unique_together = (("driver", "restaurant"),)
This is a tuple of tuples that must be unique when considered together. It’s used in the Django admin and is enforced at the database level (i.e., the appropriate UNIQUE
statements are included in the CREATE TABLE
statement).
For convenience, unique_together can be a single tuple when dealing with a single set of fields:
unique_together = ("driver", "restaurant")
A ManyToManyField
cannot be included in unique_together. (It’s not clear what that would even mean!) If you need to validate uniqueness related to a ManyToManyField
, try using a signal or an explicit through
model.
The ValidationError
raised during model validation when the constraint is violated has the unique_together
error code.
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