On May 3, 2010, at 11:55:33, Dan Rowley wrote: > Yes, that's what I meant. "self in %@". This would evaluate to true in any > case where the object exists in the specified set. At least theoretically, > as I'm not sure I understood your original question completely. :) > > I haven't actually tried this, but theoretically simple membership lookups > on a set would be much quicker than the same on an array, so you might > consider a set of missions instead of an array for this operation.
Well, I have an array as a result of a previous query, so that'll have to do. It's small, though, so I'm not too worried. Thanks! > > > D > > > > > On 5/3/10 11:17 AM, "cocoa-dev-requ...@lists.apple.com" > <cocoa-dev-requ...@lists.apple.com> wrote: > >> >> Wrong assumption; you would actually use "SELF" in a format string, as it is >> a >> reserved word. So @"SELF IN %@" >> >> I think... >> >> >> Fred Reimer, CCIE 23812 CISSP 107125 >> mailto:frei...@freimer.org >> >> >> >> On May 2, 2010, at 4:32 PM, Frederick Reimer wrote: >> >>> 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/archive%40mail-archive.com This email sent to arch...@mail-archive.com
