从 Firebase 数据库获取数据不起作用

Question

im new in firebase and im trying to get data from firebase database

Database structure :

JS Code :

const userAnswersRef = admin.database().ref('/ChatbotProj/answers').child(userId);

return userAnswersRef.once('value')
  .then((dataSnapshot1) => {
    console.log("Fetching successed.");
    if (!dataSnapshot1.exists()) {
      return {}
    }
    var answers = dataSnapshot1.val();
    delete answers.lastQuestionId;
    return answers;
  });
};

I'm trying to get answers from the database. The problem is that the code return null when I execute dataSnapshot1.val(); even though that answers is not null

Can anyone help me ? Thanks

Answer 1

After answers you need to include "/", otherwise the resulting path would look like,

/ChatbotProj/answers12345uid

instead of,

/ChatbotProj/answers/12345uid

Set it like the example below,

const userAnswersRef = admin.database().ref('/ChatbotProj/answers/').child(userId);

Or, as I prefer to do it,

const userAnswersRef = admin.database().ref("ChatbotProj").child("answers").child(userId);