Parse.com。自定義子類屬性不會保存。 iOS的

Question

我有我的UserFavourite類，看起來像這樣：

UserFavourite.h 

#import <Foundation/Foundation.h> 
#import <Parse/Parse.h> 
#import "Product.h" 


@interface UserFavourite : PFObject <PFSubclassing> 

@property (nonatomic, copy) Product* product; 
@property (nonatomic, copy) PFUser* user; 

+(NSString *)parseClassName; 

-(id)initWithProducts:(Product*)product 
       user:(PFUser *)user; 

@end 

UserFavourite.m 

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

@implementation UserFavourite 

@dynamic product, user; 

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

-(id)initWithProducts:(Product*)product 
       user:(PFUser *)user{ 
    self = [super init]; 
    if (self) { 
     self.product = product; 
     self.user = user; 
    } 
    return self; 
} 

@end 

這是我做的插入代碼：

//Getting product from Parse 
PFQuery *query = [PFQuery queryWithClassName:@"Product"]; 
UserFavourite *uf = [[UserFavourite alloc] init]; 
[query getObjectInBackgroundWithId:@"NhKrnlzeeN" block:^(PFObject *product1, NSError *error) { 

    [uf setUser:[PFUser currentUser]]; 
    Product* pr = [[Product alloc] init]; 

    pr.name = [product1 objectForKey:@"name"]; 
    pr.category = [product1 objectForKey:@"category"]; 
    pr.price = [product1 objectForKey:@"price"]; 
    pr.ingridients = [product1 objectForKey:@"ingridients"]; 
    pr.protein = [product1 objectForKey:@"protein"]; 
    pr.fats = [[product1 objectForKey:@"fats"] integerValue]; 
    pr.carbo = [[product1 objectForKey:@"carbo"] integerValue]; 
    pr.calories = [[product1 objectForKey:@"calories"] integerValue]; 
    pr.likes = [[product1 objectForKey:@"likes"] integerValue]; 
    pr.quantity = [[product1 objectForKey:@"quantity"] integerValue]; 
    pr.status = [[product1 objectForKey:@"status"] integerValue]; 
    pr.objectId = product1.objectId; 


    [uf setProduct:pr]; 
    NSLog(@"uf %@", uf); 

}]; 



[uf saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) { 
    if (succeeded) { 
     // The object has been saved. 
    } else { 
     NSLog(@"Error: %@", error.description); 
    } 
}]; 

我要救這個解析服務器，但這些屬性是沒有保存到表格中，如圖所示： 我也在AppDelegate中初始化了這個子類。 我在這裏做錯了什麼？ 謝謝。

Answer 1

對getObjectInBackgroundWithId的調用是異步方法調用。以下呼叫saveInBackgroundWithBlock將在前一個呼叫完成之前呼叫，在進行任何修改之前保存uf。

要解決此問題，請將保存移到上面的完成塊中。