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I need to make sure the entry does not have the same project and case id.

How is the best way to prevent a duplicate entry?

Here the project can not have the same case twice.

class Cases(models.Model ): project = models.ForeignKey ( Project, on_delete = models.CASCADE ) case = models.ForeignKey ( Case, on_delete = models.CASCADE ) active = models.BooleanField ( default = 1 )

Thank you.

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You can use unique_together in Meta class in you model as below.

class Cases(models.Model ): project = models.ForeignKey ( Project, on_delete = models.CASCADE ) case = models.ForeignKey ( Case, on_delete = models.CASCADE ) active = models.BooleanField ( default = 1 ) class Meta: unique_together = ('project', 'case')

This will set unique constraint on project_id and case_id.

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