Redux toolkit and RTK Query

Install Redux Toolkit and React-Redux

npm install @reduxjs/toolkit react-redux

Create a Redux Store

app/store.js

import { configureStore } from '@reduxjs/toolkit'
export const store = configureStore({
  reducer: {},
})

Provide the Redux Store to React

import React from 'react'
import ReactDOM from 'react-dom'
import './index.css'
import App from './App'
import { store } from './app/store'
import { Provider } from 'react-redux'
ReactDOM.render(
  <Provider store={store}>
    <App />
  </Provider>,
  document.getElementById('root')
)

Create a Redux State Slice

src/features/counter/counterSlice.js


import { createSlice } from '@reduxjs/toolkit'
const initialState = {
  value: 0,
}

export const counterSlice = createSlice({
  name: 'counter',
  initialState,
  reducers: {
    increment: (state) => {
      state.value += 1
    },
    decrement: (state) => {
      state.value -= 1
    },
    incrementByAmount: (state, action) => {
      state.value += action.payload
    },
  },
})

// Action creators are generated for each case reducer function
export const { increment, decrement, incrementByAmount } = counterSlice.actions

export default counterSlice.reducer

Add Slice Reducers to the Store

import { configureStore } from '@reduxjs/toolkit'
import counterReducer from '../features/counter/counterSlice'
export const store = configureStore({
  reducer: {
    counter: counterReducer,
  },
})

Use Redux State and Actions in React Components

features/counter/Counter.js

import React from 'react'
import { useSelector, useDispatch } from 'react-redux'
import { decrement, increment } from './counterSlice'

export function Counter() {
  const count = useSelector((state) => state.counter.value)
  const dispatch = useDispatch()
  return (
    <div>
      <div>
        <button
          aria-label="Increment value"
          onClick={() => dispatch(increment())}
        >
          Increment
        </button>

        <span>{count}</span>

        <button
          aria-label="Decrement value"
          onClick={() => dispatch(decrement())}
        >
          Decrement
        </button>
      </div>
    </div>
  )
}

RTK Query 

import createApi
import { createApi, fetchBaseQuery } from '@reduxjs/toolkit/query/react'
// Define a service using a base URL and expected endpoints
export const ImagesApi = createApi({
  reducerPath: 'imagesApi',
  baseQuery: fetchBaseQuery({ baseUrl: 'https://jsonplaceholder.typicode.com/' }),
  endpoints: (builder) => ({
    getImages: builder.query({
      query: () => `/users`,
    }),
  }),
})
export const { useGetImagesQuery } = ImagesApi;

Configure the store

import {configureStore} from '@reduxjs/toolkit';
import counterReducer from '../features/counter/counterSlice';
import { ImagesApi } from '../Apis/ImagesApi';
export default configureStore({
    reducer:{
        counter: counterReducer,
        [ImagesApi.reducerPath]: ImagesApi.reducer
    },
    middleware: (getDefaultMiddleware)=>getDefaultMiddleware().concat(ImagesApi.middleware)
})

Use Hooks in Components

import { useGetImagesQuery } from "./Apis/ImagesApi";
let Photos=()=>{
        const {data, error, isLoading, isSuccess} =useGetImagesQuery();
        console.log(data);
    return(
        <>        
        {error && "Something wrong"}
            <h1>Images collection</h1>
            {isLoading && "Loading.."}
            {
               isSuccess && data.map((value, index, item)=>{
                    return(
                        <div key={value.id}>
                            <h4>{value.name}</h4>                            
                        </div>
                    )
                })
            }
        </>
    )
}
export default Photos;

Mutations

// src/taskApi.js

createApi({
  reducerPath: "tasksApi",
  baseQuery: fetchBaseQuery({
    baseUrl: "http://localhost:5000/"
  }),
  tagTypes: ["Task"],
  endpoints: (builder) => ({
    tasks: builder.query({
      query: () => "/tasks",
      providesTags: ["Task"]
    }),
    addTask: builder.mutation({
      query: (task) => ({
        url: "/tasks",
        method: "POST",
        body: task
      }),
      invalidatesTags: ["Task"]
    }),
    updateTask: builder.mutation({
      query: ({ id, ...rest }) => ({
        url: `/tasks/${id}`,
        method: "PUT",
        body: rest
      }),
      invalidatesTags: ["Task"]
    }),
    deleteTask: builder.mutation({
      query: (id) => ({
        url: `/tasks/${id}`,
        method: "DELETE"
      }),
      invalidatesTags: ["Task"]
    })
  })
});