javascript - objectId 上的 PFQuery.find 未在 Parse JavaScript SDK(云代码)中返回唯一行

Question

我是 Parse 和 Cloud Code 的新手，但我已经成功编写了一些运行良好的 AfterSave Cloud Code 函数。然而，我在这方面遇到了很多麻烦，我不明白为什么。请帮忙...

我有

• 两个 PFObject 类:Message 和 MessageThread
• 消息包含与 MessageThread 关联的聊天消息
• MessageThread 包含一个成员数组(都是 PFUser)

• 插入消息后，我想查找相关 MessageThread 的所有成员并向他们推送通知

  class MessageThread: PFObject {
  
      @NSManaged var members: [PFUser]
      @NSManaged var lastMessageDate: NSDate?
      @NSManaged var messageCount: NSNumber?
  
      override class func query() -> PFQuery? {
          let query = PFQuery(className: MessageThread.parseClassName())
          query.includeKey("members")
          return query
      }
      init(members: [PFUser], lastMessageDate: NSDate?, messageCount: NSNumber?) {
          super.init()
  
          self.members = members
          self.lastMessageDate = lastMessageDate
          self.messageCount = messageCount
      }
  
      override init() {
          super.init()
      }
  }
  extension MessageThread: PFSubclassing {
      class func parseClassName() -> String {
          return "MessageThread"
      }
      override class func initialize() {
          var onceToken: dispatch_once_t = 0
          dispatch_once(&onceToken) {
              self.registerSubclass()
          }
      }
  }
  class Message: PFObject {
      @NSManaged var messageThreadParent: MessageThread
      @NSManaged var from: PFUser
      @NSManaged var message: String
      @NSManaged var image: PFFile?
  
      override class func query() -> PFQuery? {
          let query = PFQuery(className: Message.parseClassName())
          query.includeKey("messageThreadParent")
          return query
      }
      init( messageThreadParent: MessageThread, from: PFUser, message: String, image: PFFile?) {
          super.init()
  
          self.messageThreadParent = messageThreadParent
          self.from = from
          self.message = message
          self.image = image
          }
      override init() {
          super.init()
      }
  }
  extension Message: PFSubclassing {
      class func parseClassName() -> String {
          return "Message"
      }
      override class func initialize() {
          var onceToken: dispatch_once_t = 0
          dispatch_once(&onceToken) {
              self.registerSubclass()
          }
      }
  }
  

方法

• 从请求对象(消息)中获取其 messageThreadParent
• 查找父 MessageThread 的成员，循环遍历它们等。

问题

• 当我尝试检索 MessageThread 对象时，我尝试查询 Id == threadParent.objectId。但是，此查询始终返回我当前的全部 8 个 MessageThread，而不是我需要的单个 MessageThread。

  Parse.Cloud.afterSave(Parse.Object.extend("Message"), function(request) {
  
  Parse.Cloud.useMasterKey();
  
  var theMsg = request.object;
  var threadParent;
  var currUsername = request.user.get("username");
  var threadUsers;
  var usernameArray;
  
  threadParent = request.object.get("messageThreadParent");
  
  // promise 
  queryM = new Parse.Query(Parse.Object.extend("MessageThread"));
  queryM.include("members");
  queryM.equalTo("id", threadParent.objectId);
  queryM.find().then(function (threadParam) {
  
  console.log(" threads: ");
  console.log(threadParam.length); //this returns 8, which is the number of threads I have.  I would expect just 1, matching threadParent.objectId...
  console.log("thread is: ");
  
  //... additional code follows, which seems to work...
  

Answer 1

在努力解决一个单独的问题一整天后，我终于发现在 Parse 的 Javascript SDK 中，“id”和“objectId”之间存在差异。

改变这个

 queryM.equalTo("id", threadParent.objectId); // doesn't work

至

 queryM.equalTo("objectId", threadParent.id); // works!

解决了我的问题。