PFUser财产上的子类PFObject

Question

我子类的PFObject下面的类（动态性能和+负载& parseClassName方法在.m文件）

@interface DAOpponents : PFObject <PFSubclassing> 
@property (nonatomic, strong) PFObject* fromUser; 
@property (nonatomic, strong) PFObject* toUser; 
@property (nonatomic) BOOL isVisible; 
@property (nonatomic) BOOL isPersistent; 
+ (NSString *)parseClassName; 
@end 

在单元测试我尝试创建一个样DAOpponents-对象：

DAOpponents* follow = [DAOpponents object]; 
follow.fromUser = user1; // caught "NSInvalidArgumentException", "PFObject values may not have class: PFUser" 
follow.toUser = user2; 
[follow save]; 

如果我做同样没有对手的一个子类的版本有没有异常

PFObject* follow = [[PFObject alloc] initWithClassName:@"DAOpponents"]; 
[follow setObject:user1 forKey:@"fromUser"]; // no exception!!! 
[follow setObject:user1 forKey:@"toUser"]; 

为什么子类PFObject不能指向PFUser对象？

任何帮助表示赞赏！非常感谢！

Answer 1

我能够解决这个问题首先继承PFUser，然后在我的其他PFObject子类中使用名为User的子类。

我PFUser子类，User.h：

#import <Parse/Parse.h> 

@class Person; 
@class Parish; 

@interface User : PFUser<PFSubclassing> 
//+ (NSString *)parseClassName; 

// Return the current user 
+ (User *)currentUser; 

@property (retain) NSNumber *acceptedAgreements; 
@property (retain) NSNumber *isAdmin; 
@property (retain) Person *person; 

@end 

和我User.m：

#import "User.h" 
#import <Parse/PFObject+Subclass.h> 
#import "Person.h" 

@implementation User 

@dynamic acceptedAgreements; 
@dynamic isAdmin; 
@dynamic person; 

//+ (NSString *)parseClassName { 
// return @"User"; 
//} 

// Return the current user 
+ (User *)currentUser { 
    return (User *)[PFUser currentUser]; 
} 

@end