Quick and Dirty proxyForJson Implementation on NSManagedObject

NSManagedObject+JSON.m

@implementation NSManagedObject (NSManagedObject_JSON)

/*
 *
 * This method is implemented to help NSObject+JSON with transforming to JSON as per SBJSON's JSONValue helper method. 
 *
 */
-(NSDictionary*) proxyForJson {
    NSDictionary * attributes = [[self entity] attributesByName];
    NSDictionary * relationships = [[self entity] relationshipsByName];
    
    NSMutableDictionary * results = [NSMutableDictionary dictionary];
    
    for (NSString * relationship in [relationships keyEnumerator]) {
        id value = [self valueForKey:relationship];
        if(value) {
            if([value isKindOfClass:[NSSet class]]) {
                [results setObject:[(NSSet*)value allObjects] forKey:relationship];
            }
            else {
                [results setObject:value forKey:relationship];
            }
        }
    }
    
    for (NSString * attribute in [attributes keyEnumerator]) {
        id value = [self valueForKey:attribute];
        if(value) {
            [results setObject:value forKey:attribute];
        }
    }
    
    return results;
}

@end