Non-unique primary_key

A non-unique primary key allows the same value to be used for multiple records thus multiple results could be returned for Model.objects.get(pk=1).

A primary key is used to uniquely identify each record in the Model's database table.

primary_key=True denotes the field is the primary key for the model.

primary_key=True implies null=False and unique=True.

So in practice, do this


class SomeModel(models.Model):
    some_field = models.CharField(primary_key=True)

Instead of this


class SomeModel(models.Model):
    some_field = models.CharField(
        primary_key=True,
        unique=False
    )

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Configuring this check

Django Doctor will run this check by default. No configuration is needed but the check can be turned on/off using check code non-unique-primary in your pyproject.toml file.

Read more about configuring Django Doctor.