GDL2 custom class creation

 From what class should custom enterprise objects inherit, NSObject or  
EOGenericRecord?  I've tried both ways and have not been successful  
running the following code snippet:

job = [[ESJob alloc] init];
[job setStyle:8];
[ec insertObject:job];
[ec saveChanges];
NSLog(@"%@", [jobDS fetchObjects]);

where ec is my EOEditingContext and jobDS is an EODatabaseDataSource  
for the ESJob entity (I followed the setup in the GDL2 examples).   
When I inherit from EOGenericRecord, the code fails when saving  
changes and gives the output I copied in below.  When ESJob inherits  
from NSObject, the code fails when I attempt to fetch the objects.

I am running OS X (Leopard) and am using the sources from svn (the  
revision I'm working with is 26179).  My library combo is apple-apple- 
apple.  I've included the interface and implementation files for my  
ESJob class below the error output I've received.  If you need any  
other info, please let me know.


Thank you,
Blake


*** Error when ESJob inherits from EOGenericRecord ***
2008-03-03 01:35:52.710 test[33391:10b] *** Assertion failure in - 
[EODatabase entityForObject:], EODatabase.m:321
2008-03-03 01:35:52.734 test[33391:10b] No object entity name for  
object <ESJob 0x42f530 : classDescription=(null)
values={
}> of class ESJob (No object entity name for object <ESJob 0x42f530 :  
classDescription=(null)
values={
}> of class ESJob)
2008-03-03 01:35:52.738 test[33391:10b] *** Terminating app due to  
uncaught exception 'NSInternalInconsistencyException', reason: 'No  
object entity name for object <ESJob 0x42f530 : classDescription=(null)
values={
}> of class ESJob'
2008-03-03 01:35:52.772 test[33391:10b] Stack: (
     2487029492,
     2479961964,
     2487029252,
     2477370852,
     1983600,
     2063704,
     959276,
     962008,
     1056412,
     11572,
     10536
)
Trace/BPT trap


*** ESJob.h ***
#import <Foundation/Foundation.h>

@interface ESJob : NSObject {
	int _style;
	ESJob *_previous;
	ESJob *_next;

}
- (int)style;
- (void)setStyle:(int)aStyle;
- (ESJob *)previous;
- (void)setPrevious:(ESJob *)prevJob;
- (ESJob *)next;
- (void)setNext:(ESJob *)nextJob;
@end

*** ESJob.m ***
#import "ESJob.h"

@implementation ESJob
- (int)style
{
	return _style;
}

- (void)setStyle:(int)aStyle
{
	[self willChangeValueForKey:@"style"];
	_style = aStyle;
	[self didChangeValueForKey:@"style"];
}

- (ESJob *)previous
{
	return _previous;
}

- (void)setPrevious:(ESJob *)prevJob
{
	[self willChangeValueForKey:@"previous"];
	[_previous autorelease];
	_previous = [prevJob retain];
	[self didChangeValueForKey:@"previous"];
}

- (ESJob *)next
{
	return _next;
}

- (void)setNext:(ESJob *)nextJob
{
	[self willChangeValueForKey:@"next"];
	[_next autorelease];
	_next = [nextJob retain];
	[self didChangeValueForKey:@"next"];
}

@end