React Query + Redux toolkit 封装异步请求

当你需要进行 Redux 和 React Query 的组合时，除了常规的 Redux 方法（例如手动派发 action 和更新 state），还可以使用 createSlice 和 React Query 进行组合，这可以让你更方便地封装异步请求和更容易地更新状态。

使用 createSlice 创建 reducer：

javascript">import { createSlice } from '@reduxjs/toolkit';
import { fetchUserInfo, fetchUserList } from './api';
import { useQuery } from 'react-query';

const userSlice = createSlice({
  name: 'users',
  initialState: {
    userInfo: null,
    userList: null,
  },
  reducers: {
    setUserInfo: (state, action) => {
      state.userInfo = action.payload;
    },
    setUserList: (state, action) => {
      state.userList = action.payload;
    },
  },
});

export const { setUserInfo, setUserList } = userSlice.actions;

export const useUserInfoQuery = (userId) => {
  const { data, isLoading, isError } = useQuery(['userInfo', userId], () => fetchUserInfo(userId));

  if (data) {
    dispatch(setUserInfo(data));
  }

  return {
    user: useSelector((state) => state.users.userInfo),
    isLoading,
    isError,
  };
};

export const useUserListQuery = () => {
  const { data, isLoading, isError } = useQuery('userList', fetchUserList);

  if (data) {
    dispatch(setUserList(data));
  }

  return {
    userList: useSelector((state) => state.users.userList),
    isLoading,
    isError,
  };
};

export default userSlice.reducer;

接着，在 store 中注册 userReducer reducer，并添加 React Query Provider，这样可以在整个应用程序中共享 React Query 的 cache，避免重复的请求。

javascript">import { configureStore } from '@reduxjs/toolkit';
import { QueryClient, QueryClientProvider } from 'react-query';
import { Provider } from 'react-redux';
import userReducer from './userSlice';

const queryClient = new QueryClient();

const store = configureStore({
  reducer: {
    users: userReducer,
  },
});

ReactDOM.render(
  <Provider store={store}>
    <QueryClientProvider client={queryClient}>
      <App />
    </QueryClientProvider>
  </Provider>,
  document.getElementById('root')
);

最后，在组件中使用创建的 useUserInfoQuery 和 useUserListQuery hooks，展示用户信息和用户列表。

javascript">import { useUserInfoQuery, useUserListQuery } from './userSlice';

const UserInfo = ({ userId }) => {
  const { user, isLoading, isError } = useUserInfoQuery(userId);

  if (isLoading) {
    return <div>Loading</div>;
  }

  if (isError) {
    return <div>Error</div>;
  }

  return (
    <div>
      <h1>{user.name}</h1>
      <p>{user.email}</p>
      <p>{user.phone}</p>
    </div>
  );
};

const UserList = () => {
  const { userList, isLoading, isError } = useUserListQuery();

  if (isLoading) {
    return <div>Loading</div>;
  }

  if (isError) {
    return <div>Error</div>;
  }

  return (
    <div>
      {userList.map(user => (
        <div key={user.id}>
          <h2>{user.name}</h2>
          <p>{user.email}</p>
          <p>{user.phone}</p>
        </div>
      ))}
    </div>
  );
};