[Answered ]-'At least one of these fields must be filled' – Can I enforce this requirement in Django models?

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It can’t be done at the model level, but it may be possible to add a constraint at the database level that can enforce this.

👤Ignacio Vazquez-Abrams

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Since Django 1.2 you can use clean() method of the model where you can make such check.
https://docs.djangoproject.com/en/dev/ref/models/instances/?from=olddocs#django.db.models.Model.clean

👤nmb.ten

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