从另一个商店切片中的一个存储切片调用一个 redux 操作

Calling one redux action from one store slice in another store slice

提问人:Vight 提问时间:5/16/2021 最后编辑:Lin DuVight 更新时间:5/21/2021 访问量:1062

问:

我是 redux 的新手。在我的应用程序中,我正在使用 redux thunk 的一些异步操作。 例如,我有这个操作从 API 加载电影:

export const loadMovies = (url) => async (dispatch) => {
  const response = await fetch(url);
  const result = await response.json();
  const { total_pages: totalPages, results: movies } = result;
  dispatch(moviesLoaded(totalPages, movies));
};

我有情况L,如果没有要加载的电影(在数据库中搜索没有给我结果),所以我想将状态(它是另一个redux商店切片)更新为“没有电影”,例如。并根据该状态呈现不同的组件。

所以我的新动作是这样的:

    export const loadMovies = (url) => async (dispatch) => {
      const response = await fetch(url);
      const result = await response.json();
      if (result) {
      const { total_pages: totalPages, results: movies } = result;
      dispatch(moviesLoaded(totalPages, movies));
      } else {
       dispatch(updateStatus('no-movies')) // updateStatus is imported from another redux store slice
      }
    };

我想知道这样做可以吗?或者,将操作从一个商店切片导入到另一个商店切片是一种不好的做法。还有什么更好的方法来处理这种情况。

JavaScript reactjs redux-thunk

评论


答:

2赞 Lin Du 5/20/2021 #1

您无需从其他商店切片导入操作。您可以在多个商店切片的 reducer 中处理相同的查询电影操作类型。有关详细信息,请参阅允许多个 Reducer 响应相同的操作

例如

import { createStore, applyMiddleware, combineReducers } from 'redux';
import thunk from 'redux-thunk';

const GET_MOVIES_FULFILLED = 'GET_MOVIES_FULFILLED';

function moviesLoaded(totalPages, movies) {
  return {
    type: GET_MOVIES_FULFILLED,
    payload: {
      totalPages,
      movies,
    },
  };
}

export const loadMovies = () => async (dispatch) => {
  //   const response = await fetch(url);
  //   const result = await response.json();
  // mock result
  const result = { total_pages: 0, results: [] };
  const { total_pages: totalPages, results: movies } = result;
  dispatch(moviesLoaded(totalPages, movies));
};

const rootReducer = combineReducers({
  sliceA(state = { totalPages: 0, movies: [] }, action) {
    switch (action.type) {
      case GET_MOVIES_FULFILLED:
        return action.payload;
      default:
        return state;
    }
  },

  sliceB(state = { status: '' }, action) {
    switch (action.type) {
      case GET_MOVIES_FULFILLED:
        if (!action.payload.movies || !action.payload.movies.length) {
          return {
            status: 'no movies',
          };
        }
      default:
        return state;
    }
  },
});

const store = createStore(rootReducer, applyMiddleware(thunk));

store.dispatch(loadMovies() as any).then(() => {
  console.log(store.getState());
});

输出:

{
  sliceA: { totalPages: 0, movies: [] },
  sliceB: { status: 'no movies' }
}

调度操作,处理它并减少。GET_MOVIES_FULFILLEDsliceAsliceB

如果没有电影,我们将 的状态设置为 。sliceB{status: 'no movies'}