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Use multiwidget for many to many field with readonly additional data

I've the following models: class Exam(models.Model): participants = models.ManyToMany(settings.AUTH_USER_MODEL, through='Participation') class Participation(models.Model) user = models.OneToOneField(settings.AUTH_USER_MODEL) exam = models.ForeignKey('Exam') specific_number = models.PositiveIntegerField(editable=False) As you can see, the data I'm storing in intermediary model is readonly. It's generated automatically by the system when an instance is created. So I'd like to be...