Core Data: Inverse relationship only mirrors when I edit the mutableset. Not sure why.
- by zorn
My model is setup so Business has many clients, Client has one business. Inverse relationship is setup in the mom file.
I have a unit test like this:
- (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]);
}
I implement -newClient inside of PTBusiness like this:
- (PTClient *)newClient
{
PTClient *client = [NSEntityDescription insertNewObjectForEntityForName:@"Client" inManagedObjectContext:[self managedObjectContext]];
[client setBusiness:self];
[client updateLocalDefaultsBasedOnBusiness];
return client;
}
The test fails because [[business clients] count] is still 0 after -newClient is called.
If I impliment it like this:
- (PTClient *)newClient
{
PTClient *client = [NSEntityDescription insertNewObjectForEntityForName:@"Client" inManagedObjectContext:[self managedObjectContext]];
NSMutableSet *group = [self mutableSetValueForKey:@"clients"];
[group addObject:client];
[client updateLocalDefaultsBasedOnBusiness];
return client;
}
The tests passes.
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?
Any other troubleshooting recommendations? I'd really like to figure out why I can't set up the relationship at the client end.
