I was trying to create 'EmailAddress' model to store multiple emails for an 'user'. The model has and 'is_primary' field with null=True and unique_together = ('user', 'is_primary') So if EmailAddress Instance has is_primary set to false, only one primary email can be set for each user; And that's exactly I want. but using validator with is_primary(BooleanField) is too much messy work to do, No!? Django should come with something like 'allow_false' by default for only BooleanField
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