On Jul 1, 2010, at 11:30 AM, Rainer Standke wrote: > I have a core data app where I don't necessarily know when managed objects go > away, as in: become faults, will be deleted etc.. I also need to add the > observer to the managed object in awakeFromFetch, but that gets not only > called upon opening an existing object, but also later on when fetches are > executed. > > I take it the answer to my question is no? As in: No, an object can not ask > another if it's being observe by it?
Specifically, no, because an object is completely ignorant of what it is observing, except when specifically implemented otherwise. The observed object *does* know what objects have registered with it, but the data structure is opaque and undocumented, and subject to change (AFAIK). > For now I have solved the problem by setting a flag on the managed object > when it registers itself for observation. > > Rainer > > > On Jul 1, 2010, at 9:15 , Kyle Sluder wrote: > >> On Jul 1, 2010, at 8:26 AM, Rainer Standke <li...@standke.com> wrote: >> >>> Hello all, >>> >>> is it possible to determine if one object is observing another? >>> Specifically, I'd like one object to ask another "are you observing me?". >>> That way I could determine if I need to remove that observer before I let >>> go of the observed object... >> >> This is a very good indication that you have an inverted or cyclical >> dependency. Your observee shouldn't need to know about your observers. >> >> What is your specific setup? >> >> --Kyle Sluder Keary Suska Esoteritech, Inc. "Demystifying technology for your home or business" _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
