Hello, I'm trying to figure out how to use NSExpressions in a predicate but find the documentation a bit deficient.
Here is what I want to do: I have an array - array A - containing objects with a "title" and "subtitle" property. I want to filter this array so it only contains the objects in array B. The example below demonstrates what I want to achieve, but lacks in precision. It only checks the presence of the title and subtitle in array B, so the pair could just as well belong to two different objects. I need to know that both the title and subtitle of object X in array A matches the title and subtitle of object Y in array B. Will a NSExpression let me do this? NSArray *arrayB = [self getObjects] ; NSArray *titles = [arrayB arrayByApplyingSelector:@selector(title)]; NSArray *subtitles = [arrayB arrayByApplyingSelector:@selector(subtitle)]; NSPredicate *predicate = [NSPredicate predicateWithFormat:@"(title IN %@) AND (subtitle IN %@)", titles, subtitles]; NSArray *result = [arrayA filteredArrayUsingPredicate:predicate]; Regards, Fabian _______________________________________________ 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 [EMAIL PROTECTED]