NSPredicate speed improvement?
NSPredicate speed improvement?
- Subject: NSPredicate speed improvement?
- From: Koen van der Drift <email@hidden>
- Date: Sat, 01 Mar 2014 07:22:25 -0500
Consider two entities in a many-to-many relationship: Library and Book. In a NSFetchResultController backed UITableView, I like to show all the books from one library, so I constructed the following fetch request:
NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName: @"Book"];
NSSortDescriptor *sort = [[NSSortDescriptor alloc] initWithKey: @"date" ascending: YES];
[fetchRequest setSortDescriptors: @[sort]];
NSPredicate *predicate = [NSPredicate predicateWithFormat: @"libraries contains[cd] %@", self.library];
[fetchRequest setPredicate: predicate];
which is then fed into the NSFetchedResultController when the view opens.
There is a noticeable delay of a few 100 ms when the view opens, and I suspect that the predicate I have is not optimal by using 'contains'.
Is there a way to improve on this?
Thanks,
- Koen.
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