ios - PFObject 子类作为另一个 PFObject 子类中的属性

Question

[X-Post from parse.com]

Person是 PFObject 的子类 .

Address也是 PFObject 的子类 . Address有一个 @property类型 Person .

即

// Person.h

@interface Person : PFObject<PFSubclassing>
@property (retain) NSString *firstName;
@property (retain) NSString *secondName;
+ (NSString *)parseClassName;
@end

// Person.m

#import <Parse/PFObject+Subclass.h>

@implementation PP4MEAddress
@dynamic firstName;
@dynamic firstName;
+ (NSString *)parseClassName {
    return @"Person";
}

// Address.h

@interface Address : PFObject<PFSubclassing>

@property (retain) Person *deliverToPerson;
@property (retain) NSString *line1;
@property (retain) NSString *line2;

+ (NSString *)parseClassName;

// Address.m
#import <Parse/PFObject+Subclass.h>

@implementation PP4MEAddress
@dynamic deliverToPerson;
@dynamic line1;
@dynamic line2;

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

两个子类都在App Delegate中注册了.

在 MyViewController 中的一个方法中我想这样设置这些

例如

-(void)myMethod
{

    Address *address = [Address object];
    address.deliverToPerson.firstName = @"John";
    address.deliverToPerson.secondName = @"Smith";
    address.line1 = @"123";
    address.line2 = @"Main Street";
    [address saveInBackground];

}

执行此代码时，Class Address 的条目被输入到 Data Browser在 Parse.com Web 应用程序上。但是，唯一的列是 objectId , createdAt , updatedAt和 ACL

我想这是因为，在引擎盖下 Address @property类型 Person不是 allocated和 initialised .

我该如何克服这个问题？

我要写一个自定义 setter和 getter对于

@property (retain) Person *deliverToPerson;

在Address.m ？

如果是这样，我注意到 @property是atomic因此我需要在 setter 中编写锁定代码和 getter ？

谢谢

Answer 1

我不熟悉 parse.com，但我强烈认为您必须在设置关系之前分配 Person 对象。有点像

Address *address = [Address object];
address.line1 = @"123";
address.line2 = @"Main Street";

Person *person = [Person object];
person.firstName = @"John";
person.secondName = @"Smith";
address.deliverToPerson = person;

[address saveInBackground];