On Friday, April 8, 2011 9:26:05 AM UTC+1, shadyabhi wrote: > > I have a class in models.py like: > > class UserProfile(models.Model): > user = models.ForeignKey(User) > is_counter = models.BooleanField() > is_student = models.BooleanField() > > def save(self): > if self.is_counter != self.is_student: > super(UserProfile, self).save() > else: > return False > > I have defined two types of user, either it can be a student or counterbut > never both. > I do not want the user to be both coutner as well as student. So, I defined > a custom save() such that entry is added to database when is_counter != > is_student. > > Now, when I use Admin interface to add inconsistent entry, the interface > says entry added successfully but "actually" it isn't added. How can I add > an error message that will be displayed when *False* is returned by save(). > This is the wrong place to be doing this check. If you want to validate something, you should do it in the validation step. See http://docs.djangoproject.com/en/1.3/ref/models/instances/#validating-objects - you probably want to override Model.clean(). -- DR.
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