Is your topic node self-referential? Maybe CoreData doesn't prefetch circular references.
-Heath Borders heath.bord...@gmail.com Twitter: heathborders http://heath-tech.blogspot.com On Tue, Jul 19, 2011 at 12:21 AM, Gideon King <gid...@novamind.com> wrote: > Hi, I'm doing a fetch of some objects like this: > > entity = [NSEntityDescription entityForName:kNMTopicNodeEntityKey > inManagedObjectContext:[self managedObjectContext]]; > request = [[NSFetchRequest alloc] init]; > [request setEntity:entity]; > [request setRelationshipKeyPathsForPrefetching:[NSArray > arrayWithObjects:@"topic",@"view", nil]]; > > results = [[self managedObjectContext] executeFetchRequest:request > error:&error]; > if (results) { > log4Debug(@"Loaded %d topic nodes", [results count]) > } > [request release]; > > > The log tells me id loaded my 2,000 topics. > > Then later, I do the following: > > // This is an array of topic nodes - the things that I have just fetched > NSArray *allTopics = [map.rootTopicNode allDescendantTopicNodesIncludingSelf]; > > NSSortDescriptor *sd = nil; > if (floor(NSAppKitVersionNumber) > NSAppKitVersionNumber10_5) { > sd = [NSSortDescriptor sortDescriptorWithKey:@"view.zIndex" > ascending:YES]; > } else { > sd = [[[NSSortDescriptor alloc] initWithKey:@"view.zIndex" > ascending:YES] autorelease]; > } > > for (NMTopicNodeMO *node in [allTopics sortedArrayUsingDescriptors:[NSArray > arrayWithObject:sd]]) { > Do stuff.... > } > > > But this was running really slowly, so I commented out the above couple of > lines, and did the following check: > > for (NMTopicNodeMO *ttn in allTopics) { > if ([ttn isFault]) { > log4Debug(@"Node is a fault"); > } > if ([ttn.view isFault]) { > log4Debug(@"View is fault"); > } > } > > ...and it told me that the view was a fault for every topic node (but none of > the topic nodes were faults)! > > But I told it to pre-fetch the view relationship. Any ideas why it wouldn't > work? > > > > TIA > > Gideon > > > > > > > > > _______________________________________________ > > 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/heath.borders%40gmail.com > > This email sent to heath.bord...@gmail.com > _______________________________________________ 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
