Question

在文档https://www.parse.com/docs/ios/guide#relations-using-pointers中它说，在提供的示例中，您可以找到创建游戏的用户

// say we have a Game object
PFObject *game = ...

// getting the user who created the Game
PFUser *createdBy = [game objectForKey:@"createdBy"];

但是当我使用确切的语法时，因为我想在我的＆＃34; user＆＃34;中填充指针。柱

PFUser *user = [PFUser currentUser];
NSString *username = user.username;



// Inside my queryForTable method so PFObject is returned in 
 // tableView:cellForRowAtIndexPath:object 

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"fromUser = %@", user];
PFQuery *query = [PFQuery queryWithClassName:@"Activities" predicate:predicate];

// Inside tableView:cellForRowAtIndexPath:object 

PFUser *createdBy = [object objectForKey:@"user"];

NSLog(@"User to user ---%@", createdBy);

但我得到的只是

User to user ---<PFUser: 0x7ff9024da860, objectId: aOisP569e3, localId: (null)> {
  // Nothing here
}

如果我理解正确，我是否也应该在我的用户对象中找回用户名，电子邮件等？

---更新1 ---

查看解析提供的Anypic应用程序它应该返回类似这样的内容

<PFUser: 0x7f7ff9fafc00, objectId: LfADtx1K2J, localId: (null)> {

// Stuff appears here
    displayName = "poopiu";
    facebookId = 130941340571204;
    profilePictureMedium = "<PFFile: 0x7f7ff9faf500>";
    profilePictureSmall = "<PFFile: 0x7f7ff9faf7f0>";
    username = I34MBM3WYSB5tjWIIvUvhH5fq;
}

但我的是空的，即使我有一个名为username的列未定义，所以我应该在我的PFUser对象中找到它

- 更新2 -

这是我从日志记录对象中得到的内容......

NSLog(@"Object---%@", object);

<Activities: 0x7fbbebf42d20, objectId: rDwYI5Inuk, localId: (null)> {
user = "<PFUser: 0x7fbbee1367e0, objectId: SFL0kVZ17x>";
status = 0;
>

Answer 1

在实例化query后添加以下方法调用。

[query includeKey: "user"];

默认情况下，查询不会通过查询的直接对象获取信息。

Answer 2

您确定user不是nil吗？根据{{3}}，您必须登录currentUser才能返回用户对象。

Answer 3

[createdBy fetch];

NSLog(@"User to user ---%@", createdBy);

试试希望这会有所帮助

objectForKey不适用于指针

3 个答案: