It's an error in the sense that I know that any code that tries to use certain back links, a.b_set in this example, is wrong according to what I know about my schema.
Since I don't define b_set in A if I want back links, I'd really rather not say that I don't want b_set in A if I don't want it, especially if the way I say it looks a lot like a definition of b_set. I suppose that I could make my own version of db.Reference property that create a random name for unwanted backlinks. On Oct 10, 11:51 pm, Ross Ridge <[EMAIL PROTECTED]> wrote: > Andy Freeman wrote: > > class A(db.Model): > > pass > > > class B(db.Model): > > a = db.ReferenceProperty(A) > > > In some cases, it's an error to use instances of A to refer to > > instances of B. > > > It would be nice to have some documented way to express that fact, to > > make it so that A.get(key).b_set throws an exception. > > I don't know why it would be an error or why you want to throw an > exception, but the b_set attribute is just a query. You can always > create your own query function that does whatever it is you want. > Maybe something like the following: > > class A(db.Model): > def get_b_set(self): > if self.cant_refer_back_to_b: > raise Exception > return self.b_set_private > > class B(db.Model): > a = db.ReferenceProperty(A, collection_name = > "b_set_private") > > Ross Ridge --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appengine@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en -~----------~----~----~----~------~----~------~--~---
