firebase - Flutter & Firebase：有没有办法可以将特定字段从 firebase 返回到函数？

Question

用户>用户ID然后：

我的目标是从文档中返回用户的密钥，然后能够在其他功能中使用该密钥。

  getUsersKey() async {
   final uid = await getCurrentUser();
   Firestore.instance.collection('users').document(uid).get();
   // Then I want to return the userKey feild 
  }

标签： firebasefluttergoogle-cloud-firestore

Answer 1

您可以编写以下代码：

 Future<void> getUsersKey() async {
   final uid = await getCurrentUser();

 DocumentSnapshot snapshot = 
 await Firestore.instance.collection('users').document(uid).get();
  userKey = snapshot.data['userKey'] //you can get any field value you want by writing the exact fieldName in the data[fieldName]
  }