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我是 React Native 的初学者。如果您给我任何建议，那将很有帮助，我将不胜感激。

我正在尝试firestore使用react-native, immutable.js,获取数据react-redux，redux-actions此代码也如下所示ducks structure。问题是我无法从中获取任何数据，firestore因为数据firestore来自于 reducer 执行之后。

甚至，我不确定是否可以将firestore获取方法作为createAction.

这是我的代码。

共享/index.js

import firebase from 'firebase/app';
import 'firebase/firestore'
import 'firebase/storage'

const config = {
  apiKey: "...",
  authDomain: "...",
  databaseURL: "...",
  projectId: "...",
  storageBucket: "...",
  messagingSenderId: "..."
};

firebase.initializeApp(config);
const db = firebase.firestore();
const storage = firebase.storage();

export const getCategoryNames = () => {
  return db.collection('categories').get();
}

存储/模块/categoryImgList

import {createAction, handleActions} from 'redux-actions';
import { Map, List } from 'immutable';

// firestore
import * as db from '../../shared';

// Action types
const GET_NAME = 'categoryImgList/GET_NAME';

// action creator
export const getName = createAction(GET_NAME, () => {
  db.getCategoryNames().then(data => {
    const arr = [];

    data.forEach(doc => {
        console.log(doc.data().name);
        arr.push(doc.data().name);
    });

    console.log('arr');
    console.log(arr);
  })
}); // none

const initialState = Map({
    name: List()
});

// Reducer
export default handleActions({
    [GET_NAME]: (state, { payload: name }) => {
      console.log(state);
      console.log({name});
      const item = Map({ name });
      return state.update('name', name => name.push(item));
    }
}, initialState);

太感谢了！

4

1 回答 1

1

我自己解决了这个问题。我意识到我需要redux-thunk获取异步数据。我安装redux-thunk并更改了一些代码，如下所示。

import {handleActions} from 'redux-actions';

// firestore
import * as db from '../../shared';

// Action types
const GET_CATEGORY_NAME_PENDING = 'categoryImgList/GET_CATEGORY_NAME_PENDING';
const GET_CATEGORY_NAME_SUCCESS = 'categoryImgList/GET_CATEGORY_NAME_SUCCESS';
const GET_CATEGORY_NAME_FAILURE = 'categoryImgList/GET_CATEGORY_NAME_FAILURE';

// action creator
export const getName = () => async (dispatch) => {
  dispatch({type: GET_CATEGORY_NAME_PENDING});
  try {
    const response = await db.getCategoryNames();

    const arr = [];
    response.docs.forEach(res => {
        arr.push(res.id);
    });
    console.log(arr);

    dispatch({type: GET_CATEGORY_NAME_SUCCESS, payload: arr});
    return arr;
  } catch (e) {
      console.log(e);
      dispatch({type: GET_CATEGORY_NAME_FAILURE, payload: e});
  }
}

const initialState = {
  fetching: false,
  error: false,
  name: []
};

// Reducer
export default handleActions({
  [GET_CATEGORY_NAME_PENDING]: (state) => ({ ...state, fetching: true, error: false }),
  [GET_CATEGORY_NAME_SUCCESS]: (state, action) => ({ ...state, fetching: false, name: action.payload }),
  [GET_CATEGORY_NAME_FAILURE]: (state) => ({ ...state, fetching: false, error: true })
}, initialState);
于 2018-06-16T10:44:49.843 回答