Firebase 数据库触发器的云功能？

Question

知道为什么我不能使用 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

TypeError: admin.database(...).ref(...).childByAutoId is not a function
    at exports.addPersonalRecordHistory.functions.database.ref.onWrite.event (/user_code/index.js:18:111)

Answer 1

childByAutoId() 适用于 iOS SDK。对于 admin.Database()，使用 push().

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

Answer 2

它应该像这样工作：

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"
  });
});