Question

我正在尝试在以下云函数中检索特定ID的文档。用于检索该信息的循环（请参见“阻止获取专业”），但是日志显示该函数在返回数据后正在执行该信息。我确信这是因为这会带来新的希望，并且我需要将它们捆绑在一起。

我在这里和其他地方浏览了很多帖子，只是没有理解。

似乎我正在创建一个已兑现/被遗弃的承诺。我得到了必要的数据，但menteeMajor除外，直到稍后在日志文件中才定义该数据。

exports.getAllMatchesMCR = functions.https.onCall((data, context) => {

  var dbRef = db.collection("matches");
  var dbPromise = dbRef.get();
  // return the main promise
  return dbPromise.then(function(querySnapshot) {
      var results = [];
      var idx = 0;
      querySnapshot.forEach(function(doc) {

        // push promise from get into results
        var matchObj = {
          mentorName: "",
          mentorEmployer: "",
          mentees: []
        }

        var mentor = doc.data();
        mentor.mentorID = doc.id;
        matchObj.mentorName = mentor.mentorID;
        matchObj.mentees = mentor.mentees;

        for (var curIDX in matchObj.mentees) {
          matchInfoObj = {};
          matchInfoObj.mentorID = matchObj.mentorID;
          matchInfoObj.mentorName = matchObj.mentorName;
          matchInfoObj.menteeName = matchObj.mentees[curIDX];

          // Block Get Major --->
          var menteeRef = db.collection('users').doc(matchObj.mentees[curIDX]);
        var getDoc = menteeRef.get()
          .then(doc => {
            if (!doc.exists) {
              console.log('No such document!');
            } else {
              var userInfo = {};
              userInfo = doc.data();

              matchInfoObj.menteeMajor = userInfo.major;

              // console.log('user Major:', matchInfoObj.menteeMajor);
              return userInfo.major;
            }
          })
          .catch(err => {
            // console.log('Error getting document', err);
            return ("No Mentee Doc")
          });
          
          console.log("in menteeInfo: ", getDoc.data());
          matchInfoObj.menteeMajor = getDoc.data();              // Block Get Major <---
          if (typeof something === "undefined") {
            console.log('After BLOCK Major is UNDEFINED:', matchInfoObj.menteeName);
          } else {
            console.log('After BLOCK :', matchInfoObj.menteeMajor);
          }

          results.push(matchInfoObj)
        }
      });
      // dbPromise.then() resolves to  a single promise that resolves 
      // once all results have resolved
      return Promise.all(results)
    })
    .catch(function(error) {
      console.log("Error getting documents: ", error);
    });
});

以下是两个日志的屏幕快照，它们显示了基于console.log输出的顺序。请记住，这些日志记录的类别在顶部是最新的。 Result 1 shows the start, from deployment of function and it's start, Result 2 shows the messages from the broken promise almost two minutes later.

我想做的纯文本版本是： 1.集合“用户”包含有关导师和导师的信息 2.集合“匹配”是每个Mentor（或一对多）的Mentee（数组）的文档。 3.显示一行以进行每个EACH导师/受训者连接。我有身份证，但我需要获取受训者和指导者的姓名和其他信息。

Plain old Result file shows that I am getting the rows I need with the Mentor ID, and the Mentee ID (labeled Mentees, that will change) 有人可以告诉我如何实现这一诺言吗？

诺言云Firestore功能

0 个答案: