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Core Data <--> NSTreeController ==> [MO count]: selector not recognized

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Core Data <--> NSTreeController ==> [MO count]: selector not recognized

Subject: Core Data <--> NSTreeController ==> [MO count]: selector not recognized
From: "Frederick C. Lee" <email@hidden>
Date: Fri, 24 Mar 2006 11:58:30 -0800


Simplified Tree:
	Region --->> Country --->> Province --->> City  (*city bombs*)

Simplified MO graph:

EntityManagedObject : NSManagedObject
RegionMO : EntityManagedObject
CountryMO : EntityManagedObject
ProvinceMO : EntityManagedObject
CityMO : EntityManagedObject

========

I'm using 'child' as the NSTreeController 's Children Key Path.

Inside ManagedObjects' instances:

// Entity:   <-- This gets hit first.
- (NSSet *) child {
    NSLog(@"{EntityManagedObject.m: NSSet child}");
    NSSet * tmpValue;
    [self willAccessValueForKey: @"country"];
    tmpValue = [self primitiveValueForKey: @"country"];
    [self didAccessValueForKey: @"country"];
    return tmpValue;
}

// Region:
- (NSSet *) child {
    NSLog(@"{RegionManagedObject.m: NSSet child}");
    NSSet * tmpValue;
    [self willAccessValueForKey: @"country"];
    tmpValue = [self primitiveValueForKey: @"country"];
    [self didAccessValueForKey: @"country"];
    return tmpValue;
}

// Country:
- (NSSet *) child {
    NSLog(@"{CountryManagedObject.m: NSSet child}");
    NSSet * tmpValue;
    [self willAccessValueForKey: @"province"];
    tmpValue = [self primitiveValueForKey: @"province"];
    [self didAccessValueForKey: @"province"];
    return tmpValue;
}

// Province:
- (NSSet *) child {
    NSLog(@"{ProvinceManagedObject.m: NSSet child}");
    NSSet * tmpValue;
    [self willAccessValueForKey: @"country"];
    tmpValue = [self primitiveValueForKey: @"country"];
    [self didAccessValueForKey: @"country"];
    return tmpValue;
}

// City:
- (NSSet *) child {
    NSLog(@"{CityManagedObject.m: NSSet child}");
    NSSet * tmpValue;
    [self willAccessValueForKey: @"city"];
    tmpValue = [self primitiveValueForKey: @"city"];
    [self didAccessValueForKey: @"city"];
    return tmpValue;
}

====================

NSBrowser output:

Europe --> Germany --> Bavaria ---> ! <error>

But when I click on Bavaria cell, I get the following:

{RegionManagedObject.m: NSSet child} {CountryManagedObject.m: NSSet child} {ProvinceManagedObject.m: NSSet child} *** -[CountryManagedObject count]: selector not recognized [self = 0x6a44c0] *** -[CountryManagedObject count]: selector not recognized [self = 0x6a44c0]

I'm stuck here. I was able to direct the NSTreeController child link to each subordinate MO till the Province. Beyond Province, the abyss.

I did not specify any 'count key path' in the NSTreeController attribute.

Any solution, ideas?

Ric.

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