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Subclassing NSManagedObject

Hi List,

I have created a class MyEntity which is a subclass of NSManagedObject. The Entity contains
one attribute ("name") and one to-many relationship ("myRelation").
In MyEntity I override the following two methods and I have one initWithName: method:

- (id) valueForKey:(NSString *)key;  {
	return [super valueForKey:key];
}

- (void) setValue: (id)value forKey: (NSString *)key {
	[super setValue:value forKey:key];
}

- (id) initWithName: (NSString *) newName {
	self = [super init];
	
	if(self)
		[self setValue:newName forKey:@"name"];
	
	return self;
}


Then I try to add an instance of MyEntity to an NSArrayController via addObject: with the code:

MyEntity *entity = [[MyEntity alloc] initWithName:@"My Name"];
[super addObject:entity];

While adding the object to the NSArrayController I get the following exception:

[<MyEntity 0x183310> setValue:forUndefinedKey:]: the entity (null) is not key value coding-compliant for the key name.

What is the reason for the exception? Do I have to add custom accessor methods to MyEntity? If yes, how might these methods
look like for a to-many relationship?

Thank you very much in advance,
Michael
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