> I have two models, one of them has a many to many relation to the > other one. > > I want to add some checks to the first model, so I overwrote the save > method. If my checks are not ok, I plan not to call super().save(), > but this gives me the error "'FirstModel' instance needs to have a > primary key value before a many-to-many relationship can be used." > > As far as I understood, the problem is that since I don't create the > entry in the db for the first model, the successive creation of the > association between the two models fails. > > Is there a way to stop the creation of all entries when the save > method in my first model is called?
You should consider using a custom ModelForm[1] instead of this approach. Override its clean() method to perform your checks and throw a ValidationError when you don't want the save to proceed. You can then also make the Admin use this custom form[2]. [1] http://docs.djangoproject.com/en/dev/topics/forms/modelforms/#the-save-method [2] http://docs.djangoproject.com/en/dev/ref/contrib/admin/#adding-custom-validation-to-the-admin -Rajesh D --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~----------~----~----~----~------~----~------~--~---
