在转发类对象中找不到CoreData属性

Question

我是coredata的新手，并尝试将magicalRecord库用于我的项目。 这个问题涉及2类：CPLink和LinkParsedData。这两个类是由xCode从enetities生成的。

CPLink:
#import <Foundation/Foundation.h>
#import <CoreData/CoreData.h>

@class CPData, LinkParsedData;

@interface CPLink : NSManagedObject

@property (nonatomic, retain) NSString * itemId;
@property (nonatomic, retain) NSString * lid;
@property (nonatomic, retain) NSString * state;
@property (nonatomic, retain) NSString * type;
@property (nonatomic, retain) NSString * uid;
@property (nonatomic, retain) NSString * url;
@property (nonatomic, retain) CPData *cpdata;
@property (nonatomic, retain) LinkParsedData *parsedData;

@end

LinkParsedData
#import <Foundation/Foundation.h>
#import <CoreData/CoreData.h>

@class CPLink;

@interface LinkParsedData : NSManagedObject

@property (nonatomic, retain) NSString * articleContent;
@property (nonatomic, retain) NSString * articleTitle;
@property (nonatomic, retain) NSString * ogDescription;
@property (nonatomic, retain) NSString * ogImage;
@property (nonatomic, retain) NSString * ogTitle;
@property (nonatomic, retain) NSString * postDescription;
@property (nonatomic, retain) NSString * title;
@property (nonatomic, retain) NSString * type;
@property (nonatomic, retain) CPLink *cplink;

@end

在另一种观点中。我想用这种语法访问ogImage。

self.cpLink.parsedData.ogImage

在前进类对象'LinkParsedata'中找不到属性'ogImage'

任何想法？