ios - 如何分组 PFObjects ？解析/swift

Question

您好，我正在尝试对 PFObjects 进行分组。
例如，考虑一个消息传递应用程序。

如何按传入和传出消息的用户名分组？

这是我所拥有的:

var messages = [PFObject]()

func loadMessages() {
    let query = PFQuery(className: "Messages")
    query.whereKey("user", equalTo: PFUser.current()!)
    query.includeKey("user")
    query.findObjectsInBackground { (objects, error) in
        if error == nil {

            for object in objects! {
                self.messages.append(object)
            }

        } else {
            print(error!.localizedDescription)
        }
    }
}

Answer 1

它没有内置功能，你必须自己做，例如当你想决定该消息的图像应该是 Incomming 还是 Outgoing...

for object in messages {
   if object["user_id"] as PFUser == PFUser.currentUser() {
       //the message is from the same User, set what you need
       //user_id is a column name in Messages as a pointer to User class class
   } else {
       // message was not send from currentUser
   }
}