Firebase数据库触发器的云函数？

知道我为什么不能使用childByAutoId吗

exports.addPersonalRecordHistory = functions.database.ref('/personalRecords/{userId}/current/{exerciseId}')
    .onWrite(event => {

       var path = 'personalRecords/' + event.params.userId + '/history/' + event.params.exerciseId;
       var reference = admin.database().ref(path).childByAutoId();

       reference.set({
            username: "asd",
            email: "asd"
          });
  });

错误

childByAutoId（）

用于iOS SDK。对于

admin.Database（）

，请使用

---

它应该是这样工作的：

exports.addPersonalRecordHistory = functions.database.ref('/personalRecords/{userId}/current/{exerciseId}').onWrite(event => {
  var path = 'personalRecords/' + event.params.userId + '/history/' + event.params.exerciseId;
   return admin.database().ref(path).set({
    username: "asd",
    email: "asd"
  });
});

---

但这不是我想要的数据结构

var reference = admin.database().ref(path).push();

exports.addPersonalRecordHistory = functions.database.ref('/personalRecords/{userId}/current/{exerciseId}').onWrite(event => {
  var path = 'personalRecords/' + event.params.userId + '/history/' + event.params.exerciseId;
   return admin.database().ref(path).set({
    username: "asd",
    email: "asd"
  });
});