如何将对象添加到 firebase 中的文档

Question

在我的代码中，我从现有的 Firebase 集合中获取了一个对象，然后我想将它作为一个对象添加到另一个文档中，但是我不知道该怎么做

  // Create a query against the collection.
const q = query(subjectRef, where("Subject", "==", subject), where("Board", "==", examBoard), where("Level", "==", level));
onSnapshot(q, (snapshot) => {
  snapshot.docs.forEach(doc => {
    //add a document to a subcollection in the collection users
    const auth = getAuth();
    //editted so onAuthState function is not called
    const uid = auth.currentUser.uid
    const docRef = doc(db, "users", uid);
    const colRef = collection(docRef, "subjects");
    addDoc(colRef, {
      //?????
    });
  })

文档将被添加到集合主题中，这是文档的样子：用户的结构是 (collection) users > (document) user > (collection) subjects > (document) what i want to add

Answer 1

您可以从 auth.currentUser.uid 属性获取用户 ID。以下是实现此目标的方法：

const q = query(subjectRef, where("Subject", "==", subject), where("Board", "==", examBoard), where("Level", "==", level));
onSnapshot(q, (snapshot) => {
  snapshot.docs.forEach(doc => {
    //add a document to a subcollection in the collection users
    const auth = getAuth();
    var q = doc.data()
    const colRef = collection(db, "users", auth.currentUser.uid,"subjects");
    addDoc(colRef, {
      Board:q.Board
      Level:q.Level
      Subject:q.Subject
    });
    });

如何将对象添加到 firebase 中的文档

how to add an object to a document in firebase

javascript

firebase

google-cloud-firestore