One Quickie

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Custom accessor methods (objects) (Core Data->General)

Wrap the methods with will/did Access/Change ValueForKey:, and also use KVC to set primitive values:

- (NSString *) name
{
    [self willAccessValueForKey: @"name"];
    NSString *string = [self primitiveValueForKey: @"name"];
    [self didAccessValueForKey: @"name"];
} // name

- (void) setName: (NSString *) x
{
    [self willChangeValueForKey: @"name"];
    [self setPrimitiveValue: x  forKey: @"name"];
    [self didChangeValueForKey: @"name"];
} // setName