> > > We probably cannot move checks of `primary_key` and `unique` living in > `FileField.__init__`. We test if one of these two parameters was passed; we > don't check their values. Consider that an user passes unique=False. This > is > the default value, but nevertheless, this should result in an error. We > cannot check if the attributes where passed while performing system > checks. I'm > not sure if I make myself clear. > > Why not just store a reference to the original arguments (or the relevant subsets) in __init__(), and then validate them later in a system check? That may seem a little indirect, but I think the validation system will be much nicer if we can do everything in system checks instead of splitting the work with __init__().
I think there are other places as well where we'd like to do this kind of check. For example, right now you can create a OneToOneField with unique=False and Django will silently overwrite that value and your model will validate just fine. It would be much better if trying to specify unique on a OneToOneField caused a validation error, and the same sort of pattern could be applied there: storing a reference to the original value during __init__(), overwriting with unique=True for the purposes of initializing the parent ForeignKey, and then checking the user-supplied value in a separate system check. (This is just an example, I'm not saying that you should make this change to OneToOneField now, as it's backwards-incompatible.) -- You received this message because you are subscribed to the Google Groups "Django developers" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-developers+unsubscr...@googlegroups.com. To post to this group, send email to django-developers@googlegroups.com. Visit this group at http://groups.google.com/group/django-developers. For more options, visit https://groups.google.com/groups/opt_out.
