Unfortunately, there is nothing for the NSPredicate class to go on to assume what object you are talking about. predicateWithFormat is a class method/selector/function. What object is it supposed to assume you mean if one is not supplied?
Dan Rowley sent me an email saying you may be able to use "self." So, I assume this means: NSPredicate *pred = [NSPredicate predicateWithFormat: @"%K in %@", self, favoriteMissions]; HTH, On May 2, 2010, at 9:03 AM, Rick Mann wrote: > I saw that, I had hoped that by not specifying an attribute, it would mean > the object itself, not an attribute on the object. > > > On May 2, 2010, at 05:58:39, Frederick Reimer wrote: > >> The manuals for this give the following example: >> >> NSPredicate *inPredicate = >> [NSPredicate predicateWithFormat: @"attribute IN %@", >> aCollection]; >> >> It looks like you are missing the attribute... If attribute can vary, you >> can use a %K and a NSString value representing the attribute name (it is not >> automatically enclosed in quotes as %@ values are). >> >> HTH, >> >> Fred >> On May 2, 2010, at 8:27 AM, Rick Mann wrote: >> >>> Hi. >>> >>> I have two entities: Mission and Favorite. Favorite has a single relation >>> to Mission. I need to fetch all Mission objects that exist in Favorite. I'm >>> using an NSFetchResultsController. >>> >>> I created an array with all the Mission objects found in the Favorite >>> entity. Then I tried to create a predicate like this: >>> >>> NSPredicate* pred = [NSPredicate predicateWithFormat: @"in %@", >>> favoriteMissions]; >>> >>> and use that on a fetch of Mission objects. But it complains that it can't >>> parse that format string. >>> >>> Clearly, this approach isn't going to work. I could store the Mission's key >>> in the Favorite table instead, but that's less elegant. Might be the only >>> way to go. >>> >>> Any suggestions? >>> >>> tia, >>> Rick >>> >>> _______________________________________________ >>> >>> 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/freimer%40freimer.org >>> >>> This email sent to frei...@freimer.org >>> >> > > Fred Reimer, CCIE 23812 CISSP 107125 mailto:frei...@freimer.org _______________________________________________ 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
