[Rubycocoa-talk] Re: SyncServices and RubyCocoa

[Rupert B. <rup...@fr...>]

Hi, I'm back to square one with the SimpleStickies tutorial :  
encoding and decoding seem to be going well, except that I get the  
following message while syncing :

Exception occured while syncing: Note: this class is not key value  
coding-compliant for the key "changed"

The program looks for all the "changed" entity instances to  
(presumably) sync them.
In

- (NSArray *)changedObjectsForEntityName:(NSString *)entityName
{
	NSEnumerator *recordEnumerator = [[self valueForKey:[self  
keyForEntityName:entityName]] objectEnumerator];
	id record;
	NSMutableArray *changedRecords = [NSMutableArray array];
	
	while (record = [recordEnumerator nextObject]) {
		if ([record valueForKey:@"changed"] == @"YES")			// this crashes
			[changedRecords addObject:record];
	}
	if ([changedRecords count] == 0)
		return nil;
	return changedRecords;
}

the call to '[record valueForKey:@"changed"]' crashes.

Now, I wonder if our calls to
	self.willChangeValueForKey("#{key}")

in our definition of the key_wrappers

         def kvc_wrapper_representation(*keys)
             keys.each do |key|
                 set_key = "set#{key}"
                 set_key[3..3] = set_key[3..3].upcase
                 class_eval <<- 
EOE_KVC_WRAPPER_REPRESENTATION,__FILE__,__LINE__+1
                     def #{key}
                         @_representation.valueForKey("#{key}")
                     end
                     def #{key}=(val)
                         self.willChangeValueForKey("#{key}")					#  
is this working correctly ?
                         @_representation.setValue_forKey(val, "#{key}")
                         self.didChangeValueForKey("#{key}")
                     end
                     def #{set_key}(val); self.#{key}= val; end
                     EOE_KVC_WRAPPER_REPRESENTATION
		self.addRubyMethod_withType("#{key}".to_sym, "v@:@")
		self.addRubyMethod_withType("#{set_key}:".to_sym, "v@:@")
             end
         end

is working.

Any ideas ?  Should we maybe (re ?)define the "changed" key for Note  
somewhere, or is this inherited from NSManaged Object ?
I once tried to implement inherited entities in an Objective-C  
EntityModel test, which did not work : of course, 'Entity- 
Relationship' modelling is an old father of object-modelling, so I am  
not totally surprised ...

Rup