DocumentReference.get（<Field>）不起作用

Question

我只是想找到这个布尔值，如果它是true，那么它将执行代码。否则，它将执行另一个代码。我似乎无法在Firebase中读取此布尔值。

This is the data I am trying to read.

它说here我可以做.get(fieldPath)，但是我做错了。 Firebase文档确实很糟糕。哈哈

checkIfLoggedIn = () => {
    firebase.auth().onAuthStateChanged(user => {
      if (user) {
        const uid = firebase.auth().currentUser.uid;
        const db = firebase.firestore();
        db.collection('users')
          .doc(uid)
          .get('uid.isStore')
          .then(snapshot => {
            // Trying to find how to do this
            console.log(snapshot);
          });
        this.props.navigation.navigate('mainNav');
      } else {
        this.props.navigation.navigate('signup');
      }
    });
  };

Answer 1

我认为您想要的逻辑类似于：

db.collection('users')
  .doc(uid)
  .get()
  .then(documentSnapshot => {
    let isStore = documentSnapshot.get('isStore');
    // Value of isStore here ... 
  });

链为：

• db.collection-> CollectionReference
• CollectionReference.doc()-> DocumentReference
• DocumentReference.get()-> Promise<DocumentSnapshot>
• DocumentSnapshot.get()->字段值

另请参阅：

• CollectionReference.doc()
• DocumentReference.get()
• DocumentSnapshot.get()