I'm stumped. In my model I have a Entry entity and a Reference
entity. The Entry-Reference relationship is to-many, while the
inverse is to-one. On the Entry side, the relationship's name is
"references" and on the Reference side, the relationship's name is
"entry". I've checked the setup a dozen times.
Both entities use their own NSManagedObject subclasses. I've
checked this setup a number of times, and I'm certain I am
following Core Data subclassing guidelines.
Because the Reference entity includes an "id" property which the
entry uses to keep track of it, I've added a method to the Entry
class which creates References:
- (Reference*) createReferenceForName:(NSString*)entityName {
Reference *newReference;
newReference = [NSEntityDescription
insertNewObjectForEntityForName:entityName
inManagedObjectContext:[self managedObjectContext]];
[newReference setValue:[self nextReferenceIDAndIncrement]
forKey:@"id"];
NSMutableSet *allReferences = [self mutableSetValueForKey:@"assets"];
[allReferences addObject:newReference];
return newReference;
}
The nextReferenceIDAndIncrement method looks like this:
- (NSNumber*) nextReferenceIDAndIncrement {
double nextIDdouble = [[self valueForKey:@"lastReferenceID"]
doubleValue];
NSNumber *nextID = [NSNumber numberWithDouble:++nextIDdouble];
[self setValue:nextID forKey:@"lastReferenceID"];
return nextID;
}
For entityName I'm passing in the string "Reference." Everything
seems to work. I can set properties on the Reference, display it in
an NSTableView using bindings, etc.
However, there are parts of the code which access the Entry when
the Reference has been supplied. Every time this code is called,
the valueForKey method returns an NSCFNumber instead of the Entry
with which the Reference is associated. The code is simple enough:
Entry *anEntry = [aReference valueForKey:@"entry"];
That anEntry variable is *always* a nNSCFNumber. Asking for any of
attributes (title, icon, etc) returns the correct value. I'm
completely stumped. The data model is correctly setup, I'm sure of
it. The subclasses are proper, I'm sure as well. Why does
valueForKey:@"entry" always return a number then when it is mapped
to the Entry entity?
Recently, I did rename the Reference entity from "Resource," going
through all the code and changing the necessary parts, as well as
everything in the Nib files. I originally thought that could be
related to the problem, but then I've completely re-written this
part of the data model, even using different names for the entities
and relationships. The problem remains the same. Short of trashing
the data model file and rebuilding it from scratch, I don't know
what to do.
Any direction would be appreciated.
-Phil
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