react-native - 在 Firebase 'child_removed' 监听器触发后从 redux 状态中删除嵌套子级

Question

我的 redux 状态看起来像这样(它与 Firebase 同步)。

{
  profile: {
    activeUsers: {
      Iiva2BGZffNTH84glOLXv8QHVTF2: {
        sex: male,
        age: 20,
      },
      PkfMxrN09RN7ygoBMWqm4jheEOx1: {
        sex: female,
        age: 20,
      },
      zQiGXvcUGmRSKUdr719621QleUw2: {
        sex: male,
        age: 25,
      }
    }
  }
}

我想删除用户 zQiGXvcUGmRSKUdr719621QleUw2

这是我的 Action 创作者

  Firebase.database()
    .ref('profiles/activeUsers')
    .on(
      'child_removed',
      (snapshot) => {
        dispatch(_activeUserChildRemoved(snapshot));
      },
      (err) => {
        console.log(err.toString());
        Alert.alert(err);
      },
    );
};

const _activeUserChildRemoved = snapshot => ({
  type: ACTIVE_USER_CHILD_REMOVED,
  payload: snapshot,
});

最后是我的reducer

  switch (action.type) {
    case ACTIVE_USER_CHILD_REMOVED:
      const key4Del = action.payload.key;
      return { //what goes here??? };
    default:
      return state;
  }
};

为了从 redux 中删除 snapshot.key 引用的用户，我应该从 reducer 返回什么？非常感谢帮助

Answer 1

知道了!!

case ACTIVE_USER_CHILD_REMOVED:
      const key4Del = action.payload.key;
      const oldState = state;
      delete oldState.activeUsers[key4Del];
      return { ...oldState };