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POCore Data: Inverse relationship only mirrors when I edit the mutableset. Not sure why
 

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  1. POCore Data: Inverse relationship only mirrors when I edit the mutableset. Not sure why
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    <p>My model is setup so Business has many clients, Client has one business. Inverse relationship is setup in the mom file.</p> <p>I have a unit test like this:</p> <pre><code>- (void)testNewClientFromBusiness { PTBusiness *business = [modelController newBusiness]; STAssertTrue([[business clients] count] == 0, @"is actually %d", [[business clients] count]); PTClient *client = [business newClient]; STAssertTrue([business isEqual:[client business]], nil); STAssertTrue([[business clients] count] == 1, @"is actually %d", [[business clients] count]); } </code></pre> <p>I implement <code>-newClient</code> inside of PTBusiness like this:</p> <pre><code>- (PTClient *)newClient { PTClient *client = [NSEntityDescription insertNewObjectForEntityForName:@"Client" inManagedObjectContext:[self managedObjectContext]]; [client setBusiness:self]; [client updateLocalDefaultsBasedOnBusiness]; return client; } </code></pre> <p>The test fails because <code>[[business clients] count]</code> is still <code>0</code> after <code>-newClient</code> is called.</p> <p>If I impliment it like this:</p> <pre><code>- (PTClient *)newClient { PTClient *client = [NSEntityDescription insertNewObjectForEntityForName:@"Client" inManagedObjectContext:[self managedObjectContext]]; NSMutableSet *group = [self mutableSetValueForKey:@"clients"]; [group addObject:client]; [client updateLocalDefaultsBasedOnBusiness]; return client; } </code></pre> <p>The tests passes.</p> <p>My question(s): So am I right in thinking the inverse relationship is only updated when I interact with the mutable set? That seems to go against some other Core Data docs I've read. Is the fact that this is running in a unit test without a run loop have anything to do with it?</p> <p>Any other troubleshooting recommendations? I'd really like to figure out why I can't set up the relationship at the client end.</p> <p>Update: Some people have suggested I use <code>-processPendingChanges</code> to for the relationships be updated before the end of the run loop where it typically happens. Doing this is not helping me. Another sample test that fails:</p> <pre><code>- (void)testAssigningRelationship { // BUG: for some unknow reason in this project i have to assign both ends of the relationsip manually. NSURL *modelUrl = [NSURL fileURLWithPath:[NSString stringWithFormat:@"%@/%@", [[NSBundle mainBundle] resourcePath], @"PTDataModel.momd/schemaVersion1.mom"]]; NSManagedObjectModel *managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelUrl]; NSPersistentStoreCoordinator *persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:managedObjectModel]; [persistentStoreCoordinator addPersistentStoreWithType:NSInMemoryStoreType configuration:nil URL:nil options:nil error:nil]; NSManagedObjectContext *managedObjectContext = [[NSManagedObjectContext alloc] init]; [managedObjectContext setPersistentStoreCoordinator:persistentStoreCoordinator]; PTBusiness *business = [NSEntityDescription insertNewObjectForEntityForName:@"Business" inManagedObjectContext:managedObjectContext]; STAssertTrue([[business clients] count] == 0, @"is actually %d", [[business clients] count]); PTClient *client = [NSEntityDescription insertNewObjectForEntityForName:@"Client" inManagedObjectContext:managedObjectContext]; //NSMutableSet *clients = [business valueForKey:@"clients"]; //[clients addObject:client]; [client setBusiness:business]; [managedObjectContext processPendingChanges]; STAssertTrue([business isEqual:[client business]], @"[client business] is %@", [client business]); // fails count is 0 STAssertTrue([[business clients] count] == 1, @"is actually %d", [[business clients] count]); NSSet *clientSet = [business valueForKey:@"clients"]; // fails count is 0 STAssertTrue([clientSet count] == 1, @"is actually %d", [clientSet count]); } </code></pre> <p>I've tried to recreate the bug in a fresh project that mirrors my own project's core data stack, but the fresh projects seem to work correctly. I'm really at a lose where to troubleshoot next. Sure I can work around this is my code (always use the mutableSet) but I worry about this being the tip of a bigger problem.</p>
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    1. USzorn
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      1. VTUpMod
    1. COWhy is this a "community wiki"?
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      1. USgerry3
    2. COI thought by clicking community wiki people could edit typos or what not in my question. I guess that's not what it is for?
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      1. USzorn
    3. COMany users can edit your question no matter what. If you can edit it and change it back, you should. Community wiki is for discussion rather than a question that has a specific answer -- you are asking very specific questions that have answers.
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