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.
_______________________________________________
Cocoa-dev mailing list ([email protected])
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:
https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com
This email sent to [email protected]
