objectId上的PFQuery.find在分析JavaScript SDK(云代码）中未返回唯一行

我是解析和云代码的新手，但我已经成功地编写了一些运行良好的AfterSave云代码函数。然而，我在这个问题上遇到了很多麻烦，我不知道为什么。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（这些成员都是PFUsers）

• 插入到Message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()
          }
      }
  }
  

接近

• 从请求对象（Message）中，获取其messageThreadParent
• 查找父MessageThread的成员，循环遍历它们，等等

问题

• 当我尝试检索MessageThread对象时，我尝试在Id==threadParent.objectId上进行查询。但是，此查询总是返回我当前的全部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...