On Aug 12, 2011, at 06:57 PM, Quincey Morris wrote: > On Aug 12, 2011, at 04:08 , Martin Hewitson wrote: > >> In an app I have a core data model which has a File entity which has a >> boolean attribute isText. This attribute is declared in the corresponding >> NSManagedObject subclass interface as >> >> @property (assign) BOOL isText; >> >> and in the implementation I do >> >> @dynamic isText; >> >> In Lion, accessing this with >> >> [file isText] >> >> works fine. But it doesn't work on Snow Leopard. There I have to do >> >> [[file valueForKey:@"isText"] boolValue] >> >> Is this expected behaviour? Was/is something broken on SL that was fixed on >> Lion? Or is it now broken on Lion? > > Yes. No. No. > > It's new on Lion that the internal property accessors referenced by @dynamic > support scalar types directly. In the past, if you wanted the type of > property "isText" to BOOL rather than NSNumber, you had to write a custom > getter and setter to make it so.
OK, that explains the observations. I didn't know about this new behaviour on Lion. > > For as long as you need to support 10.6 and earlier, I think you'll have to > supply the old-style custom implementations. > > I don't think I watched the 2011 WWDC video on Core Data, but it's possible > this issue is discussed in there, and there may be a more elegant workaround. I've watched that one and I don't recall this being mentioned, but I'll look back through it because perhaps it just didn't register the first time through. Thanks for the information! Martin > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Martin Hewitson Albert-Einstein-Institut Max-Planck-Institut fuer Gravitationsphysik und Universitaet Hannover Callinstr. 38, 30167 Hannover, Germany Tel: +49-511-762-17121, Fax: +49-511-762-5861 E-Mail: martin.hewit...@aei.mpg.de WWW: http://www.aei.mpg.de/~hewitson ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ _______________________________________________ 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