Re: Why are these objects still faults?
Re: Why are these objects still faults?
- Subject: Re: Why are these objects still faults?
- From: Heath Borders <email@hidden>
- Date: Tue, 19 Jul 2011 08:05:30 -0500
Is your topic node self-referential? Maybe CoreData doesn't prefetch
circular references.
-Heath Borders
email@hidden
Twitter: heathborders
http://heath-tech.blogspot.com
On Tue, Jul 19, 2011 at 12:21 AM, Gideon King <email@hidden> 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
>
>
>
>
>
>
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>
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