What is the easiest way to make it possible to fill in the field when creating a model instance, but not to change it when editing?

Question

Django

class AbstractLicense(models.Model):
    group = models.ForeignKey(RNGroup, models.CASCADE, verbose_name=_('Разрешение'))
    ...

those. when creating a "license", we can select a group, but we cannot change it when editing...

Answer 1

Edit through the model form and put this ridonly field there