從 Redux 遷移到 Redux 工具包

Question

我正在慢慢地從 Redux 遷移到 Redux 工具包。 我還是個新手，但我有這個登錄操作功能。 我如何翻譯下面的舊函數我需要createAsyncThunk來實現這個嗎？

export const login = (email, password) => (dispatch) => {
  dispatch(requestLogin());
  firebase
    .auth()
    .signInWithEmailAndPassword(email, password)
    .then((user) => {
      dispatch(responseLogin(user));
    })
    .catch((error) => {
      dispatch(loginError());
    });
};

我的身份驗證切片看起來像這樣：

const authSlice = createSlice({
  name: "authSlice",
  initialState: {
    isLoggingIn: false,
    isLoggingOut: false,
    isVerifying: false,
    loginError: false,
    logoutError: false,
    isAuthenticated: false,
    user: {},
  },
  reducers: {
    signInWithEmail: (state, action) => {
      const { email, password } = action.payload;
      firebase
        .auth()
        .signInWithEmailAndPassword(email, password)
        .then((response) => {
          const {
            uid,
            email,
            emailVerified,
            phoneNumber,
            password,
            displayName,
            photoURL,
          } = response.user;
        })
        .catch((error) => {
          console.log(error);
        });
    },
  },
  extraReducers: {},
});

Answer 1

讓我們創建一個productSlice.js

import { createSlice,createSelector,PayloadAction,createAsyncThunk,} from "@reduxjs/toolkit";

export const fetchProducts = createAsyncThunk(
  "products/fetchProducts", async (_, thunkAPI) => {
     try {
        const response = await fetch(`url`); //where you want to fetch data
        return await response.json();
      } catch (error) {
         return thunkAPI.rejectWithValue({ error: error.message });
      }
});

const productsSlice = createSlice({
   name: "products",
   initialState: {
      products: [],
      loading: "idle",
      error: "",
   },
   reducers: {},
   extraReducers: (builder) => {
      builder.addCase(fetchProducts.pending, (state) => {
        state. products = [];
          state.loading = "loading";
      });
      builder.addCase(
         fetchProducts.fulfilled, (state, { payload }) => {
            state. products = payload;
            state.loading = "loaded";
      });
      builder.addCase(
        fetchProducts.rejected,(state, action) => {
            state.loading = "error";
            state.error = action.error.message;
      });
   }
});


export const selectProducts = createSelector(
  (state) => ({
     products: state.products,
     loading: state.products.loading,
  }), (state) =>  state
);
export default productsSlice;

在你的store.js添加productsSlice: productsSlice.reducer in out store reducer。

然后在組件中使用添加這些代碼......我也更喜歡使用鈎子

import { useSelector, useDispatch } from "react-redux";

import { fetchProducts,selectProducts,} from "path/productSlice.js";

然后最后一部分像這樣在你的主管內部調用這些方法

const dispatch = useDispatch();
const { products } = useSelector(selectProducts);
React.useEffect(() => {
   dispatch(fetchProducts());
}, [dispatch]); 

最后，您可以將數據作為組件中的products進行訪問。

Answer 2

你展示的減速器是非常錯誤的。 Reducers絕不能做任何異步的事情！

你不需要createAsyncThunk ，但如果你想使用它，它會是這樣的：

export const login = createAsyncThunk(
  'login',
  ({email, password}) => firebase.auth().signInWithEmailAndPassword(email, password)
);

const authSlice = createSlice({
  name: "authSlice",
  initialState: {
    isLoggingIn: false,
    isLoggingOut: false,
    isVerifying: false,
    loginError: false,
    logoutError: false,
    isAuthenticated: false,
    user: {},
  },
  reducers: {
    /* any other state updates here */
  },
  extraReducers: (builder) => {
    builder.addCase(login.pending, (state, action) => {
      // mark something as loading here
    }

    builder.addCase(login.fulfilled, (state, action) => {
      // mark request as complete and save results
    }
  }
});

請注意， createAsyncThunk只允許將一個參數傳遞給 thunk 操作創建者，因此它現在必須是具有兩個字段的對象，而不是單獨的參數。