완전한 redux 툴킷(부분 -

// src/features/posts/postsApi.js
import { createApi, fetchBaseQuery } from '@reduxjs/toolkit/query/react';

// Define an API service using RTK Query
export const postsApi = createApi({
  reducerPath: 'postsApi',
  baseQuery: fetchBaseQuery({ baseUrl: 'https://jsonplaceholder.typicode.com/' }),
  endpoints: (builder) => ({
    fetchPosts: builder.query({
      query: () => 'posts',
    }),
    addPost: builder.mutation({
      query: (newPost) => ({
        url: 'posts',
        method: 'POST',
        body: newPost,
      }),
    }),
  }),
});

// Export hooks for usage in functional components
export const { useFetchPostsQuery, useAddPostMutation } = postsApi;

// src/app/store.js
import { configureStore } from '@reduxjs/toolkit';
import { postsApi } from '../features/posts/postsApi';

const store = configureStore({
  reducer: {
    // Add the generated reducer as a specific top-level slice
    [postsApi.reducerPath]: postsApi.reducer,
  },
  // Adding the api middleware enables caching, invalidation, polling, and other features of RTK Query
  middleware: (getDefaultMiddleware) =>
    getDefaultMiddleware().concat(postsApi.middleware),
});

export default store;

// src/features/posts/PostsList.js
import React from 'react';
import { useFetchPostsQuery } from './postsApi';

const PostsList = () => {
  const { data: posts, error, isLoading } = useFetchPostsQuery();

  if (isLoading) return <p>Loading...</p>;
  if (error) return <p>An error occurred: {error.message}</p>;

  return (
    <section>
      <h2>Posts</h2>
      <ul>
        {posts.map((post) => (
          <li key={post.id}>{post.title}</li>
        ))}
      </ul>
    </section>
  );
};

export default PostsList;

// src/features/posts/AddPostForm.js
import React, { useState } from 'react';
import { useAddPostMutation } from './postsApi';

const AddPostForm = () => {
  const [addPost, { isLoading }] = useAddPostMutation();
  const [title, setTitle] = useState('');
  const [content, setContent] = useState('');

  const handleSubmit = async (e) => {
    e.preventDefault();
    if (title && content) {
      await addPost({ title, body: content }).unwrap();
      setTitle('');
      setContent('');
    }
  };

  return (
    <section>
      <h2>Add a New Post</h2>
      <form onSubmit={handleSubmit}>
        <input
          type="text"
          value={title}
          onChange={(e) => setTitle(e.target.value)}
          placeholder="Post Title"
        />
        <textarea
          value={content}
          onChange={(e) => setContent(e.target.value)}
          placeholder="Post Content"
        />
        <button type="submit" disabled={isLoading}>
          {isLoading ? 'Adding...' : 'Add Post'}
        </button>
      </form>
    </section>
  );
};

export default AddPostForm;

// src/features/posts/postsApi.js
import { createApi, fetchBaseQuery } from '@reduxjs/toolkit/query/react';

export const postsApi = createApi({
  reducerPath: 'postsApi',
  baseQuery: fetchBaseQuery({ baseUrl: 'https://jsonplaceholder.typicode.com/' }),
  tagTypes: ['Post'],
  endpoints: (builder) => ({
    fetchPosts: builder.query({
      query: () => 'posts',
      providesTags: (result) =>
        result ? result.map(({ id }) => ({ type: 'Post', id })) : ['Post'],
    }),
    addPost: builder.mutation({
      query: (newPost) => ({
        url: 'posts',
        method: 'POST',
        body: newPost,
      }),
      invalidatesTags: ['Post'],
    }),
  }),
});

export const { useFetchPostsQuery, useAddPostMutation } = postsApi;