Re: modify attribute on a model based on the other attributes when it is added: model.clean method?
Hi Mike, I'd do it in the model save() method. Collin On Wednesday, November 12, 2014 9:38:10 AM UTC-5, Michael wrote: > > Hi, > > I would like to modify an attribute on a model based on the other > attributes when it is added from the admin or elsewhere. > > For example: > > Model A: > has FK to Model B > has FK to Model C > > Model B: > has FK to Model C > > > When I create a Model A, I choose a Model B so I'd like the FK to Model C > to be set automatically based on the FK to Model C that already exists on > Model B. > > I found the ``Model.clean`` method ( > https://docs.djangoproject.com/en/dev/ref/models/instances/#django.db.models.Model.clean) > > but it says that it is not invoked when you call your model’s save() method > so when is it invoked? I am a bit confused about the purpose of this method > then. > > I tried the clean method and I was able to make it work after some issues > but I am wondering whether that's the best way to do it? > > Thanks > Mike > > -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-users+unsubscr...@googlegroups.com. To post to this group, send email to django-users@googlegroups.com. Visit this group at http://groups.google.com/group/django-users. To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/e8025508-e936-4ffb-b677-20fc22498fd4%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
modify attribute on a model based on the other attributes when it is added: model.clean method?
Hi, I would like to modify an attribute on a model based on the other attributes when it is added from the admin or elsewhere. For example: Model A: has FK to Model B has FK to Model C Model B: has FK to Model C When I create a Model A, I choose a Model B so I'd like the FK to Model C to be set automatically based on the FK to Model C that already exists on Model B. I found the ``Model.clean`` method (https://docs.djangoproject.com/en/dev/ref/models/instances/#django.db.models.Model.clean) but it says that it is not invoked when you call your model’s save() method so when is it invoked? I am a bit confused about the purpose of this method then. I tried the clean method and I was able to make it work after some issues but I am wondering whether that's the best way to do it? Thanks Mike -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-users+unsubscr...@googlegroups.com. To post to this group, send email to django-users@googlegroups.com. Visit this group at http://groups.google.com/group/django-users. To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/72e88e1d-3ed5-4a81-8ee2-4f3b724552dd%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
