What is the method of creating a post request in Next.js 13 using both the app directory and RTK Query?

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To create a post request in Next.js 13 using the app directory and RTK Query, follow these steps:

1. Install the required dependencies: yarn add @reduxjs/toolkit react-redux @reduxjs/toolkit/query react-query
2. Create a Next.js app with npx create-next-app or use an existing one.
3. Create an API slice in the app/api directory, and define a createPost method that makes a POST request to a certain endpoint. For example:

import { createApi, fetchBaseQuery } from '@reduxjs/toolkit/query';

const API_BASE_URL = 'https://example.com/api';

export const apiSlice = createApi({
  reducerPath: 'api',
  baseQuery: fetchBaseQuery({ baseUrl: API_BASE_URL }),
  endpoints: (builder) => ({
    createPost: builder.mutation({
      query: (postData) => ({
        url: '/posts',
        method: 'POST',
        body: postData,
      }),
    }),
  }),
});

export const { useCreatePostMutation } = apiSlice;

1. Import useCreatePostMutation hook in the pages/index.js file and use it to create a new post. For example:

import { useCreatePostMutation } from '../app/api';

export default function Home() {
  const [post, setPost] = useState({ title: '', body: '' });
  const [createPost, { isLoading }] = useCreatePostMutation();

  const handleSave = async () => {
    await createPost(post);
    setPost({ title: '', body: '' });
  };

  return (
    <div>
      <input
        type="text"
        placeholder="Title"
        value={post.title}
        onChange={(e) => setPost({ ...post, title: e.target.value })}
      />
      <textarea
        placeholder="Body"
        value={post.body}
        onChange={(e) => setPost({ ...post, body: e.target.value })}
      />
      <button disabled={isLoading} onClick={handleSave}>
        Save
      </button>
    </div>
  );
}

1. When the "Save" button is clicked, the handleSave function will call the createPost method with the current post data. If the request is successful, the post state will be reset, and the form inputs will be cleared.

That's it! You now have a working post request with Next.js 13 and RTK Query.