The best way to do CRUD in large-scale Next.js Projects with Redux Toolkit & React Query
Published: 2023-12-31 07:59:36

When working on large-scale Next.js projects with Redux Toolkit and Redux Toolkit Query, it's important to follow best practices to ensure a scalable and maintainable codebase. Here's a guide on how to handle CRUD operations efficiently:

### 1. Set Up Your Project:

- **Install Dependencies:**
  Ensure you have the necessary packages installed:
  ```bash
  npm install react-redux @reduxjs/toolkit react-query
  ```

### 2. Configure Redux Toolkit and Redux Toolkit Query:

- **Redux Toolkit:**
  Set up your Redux store using Redux Toolkit. Define your slices for managing state.
  
  ```jsx
  // redux/slices/entitiesSlice.js
  import { createSlice } from '@reduxjs/toolkit';

  const entitiesSlice = createSlice({
    name: 'entities',
    initialState: {},
    reducers: {
      // Define your reducers for managing entities
    },
  });

  export const { actions, reducer } = entitiesSlice;
  ```

  ```jsx
  // redux/store.js
  import { configureStore } from '@reduxjs/toolkit';
  import entitiesReducer from './slices/entitiesSlice';

  const store = configureStore({
    reducer: {
      entities: entitiesReducer,
      // Add other reducers as needed
    },
  });

  export default store;
  ```

- **Redux Toolkit Query:**
  Set up your API endpoints using Redux Toolkit Query.

  ```jsx
  // api.js
  import { createApi, fetchBaseQuery } from '@reduxjs/toolkit/query/react';

  export const api = createApi({
    baseQuery: fetchBaseQuery({ baseUrl: '/api' }), // Adjust base URL as needed
    endpoints: (builder) => ({
      // Define your CRUD endpoints
    }),
  });

  export const { useGetEntityQuery, useCreateEntityMutation, useUpdateEntityMutation, useDeleteEntityMutation } = api;
  ```

  ```jsx
  // createApi.js
  import { api } from './api';

  export const { useGetEntityQuery, useCreateEntityMutation, useUpdateEntityMutation, useDeleteEntityMutation } = api;
  ```

### 3. Integrate with Next.js:

- **_app.js:**
  Set up your Redux store and QueryClient in the `_app.js` file.

  ```jsx
  // pages/_app.js
  import { Provider } from 'react-redux';
  import { QueryClient, QueryClientProvider } from 'react-query';
  import { ReactQueryDevtools } from 'react-query/devtools';
  import store from '../redux/store';
  import { api } from '../api';

  const queryClient = new QueryClient();

  function MyApp({ Component, pageProps }) {
    return (
      <Provider store={store}>
        <QueryClientProvider client={queryClient}>
          <Component {...pageProps} />
          <ReactQueryDevtools />
        </QueryClientProvider>
      </Provider>
    );
  }

  export default MyApp;
  ```

### 4. Use Redux Toolkit and Query Hooks in Components:

- **Example Component:**
  Use the generated hooks in your components to perform CRUD operations.

  ```jsx
  // components/EntityList.js
  import { useGetEntityQuery, useCreateEntityMutation } from '../api';

  const EntityList = () => {
    const { data: entities, error, isLoading } = useGetEntityQuery();
    const [createEntity] = useCreateEntityMutation();

    if (isLoading) return <div>Loading...</div>;
    if (error) return <div>Error: {error.message}</div>;

    return (
      <div>
        {entities.map((entity) => (
          <div key={entity.id}>{entity.name}</div>
        ))}
        <button onClick={() => createEntity({ name: 'New Entity' })}>Create Entity</button>
      </div>
    );
  };

  export default EntityList;
  ```

### 5. Optimize Performance:

- **Memoization:**
  Use `React.memo` for components that don't need to re-render on every parent render.

- **Query Caching:**
  Configure query caching strategies based on your application's requirements.

- **Redux Toolkit Query DevTools:**
  Utilize the React Query DevTools for debugging and monitoring queries.

### 6. Documentation:

- **Documentation is Key:**
  Maintain thorough documentation for your API endpoints, state management, and component usage.

### 7. Testing:

- **Unit Testing:**
  Write unit tests for your Redux slices, API endpoints, and components.

### Conclusion:

By following these guidelines, you can build scalable and maintainable Next.js applications with Redux Toolkit and Redux Toolkit Query. Keep in mind that project requirements may vary, so adapt these suggestions based on your specific needs.



Here is an example implementation for a basic CRUD functionality using Redux Toolkit and Redux Toolkit Query in a Next.js project.

### Step 1: Set Up Redux Toolkit and Redux Toolkit Query

Follow the steps outlined in the previous response to set up your Redux store, slices, and API endpoints.

### Step 2: Create Components

Let's create components for creating, reading, updating, and deleting entities.

#### `components/EntityList.js`

```jsx
import { useGetEntitiesQuery, useCreateEntityMutation, useUpdateEntityMutation, useDeleteEntityMutation } from '../api';

const EntityList = () => {
  const { data: entities, error, isLoading } = useGetEntitiesQuery();
  const [createEntity] = useCreateEntityMutation();
  const [updateEntity] = useUpdateEntityMutation();
  const [deleteEntity] = useDeleteEntityMutation();

  if (isLoading) return <div>Loading...</div>;
  if (error) return <div>Error: {error.message}</div>;

  const handleUpdate = (id, newName) => {
    updateEntity({ id, name: newName });
  };

  const handleDelete = (id) => {
    deleteEntity(id);
  };

  return (
    <div>
      {entities.map((entity) => (
        <div key={entity.id}>
          <span>{entity.name}</span>
          <button onClick={() => handleUpdate(entity.id, prompt('Enter new name:', entity.name))}>Update</button>
          <button onClick={() => handleDelete(entity.id)}>Delete</button>
        </div>
      ))}
      <button onClick={() => createEntity({ name: 'New Entity' })}>Create Entity</button>
    </div>
  );
};

export default EntityList;
```

### Step 3: Use Components in Pages

#### `pages/index.js`

```jsx
import EntityList from '../components/EntityList';

const Home = () => {
  return (
    <div>
      <h1>Entity List</h1>
      <EntityList />
    </div>
  );
};

export default Home;
```

### Step 4: Run Your Next.js App

Ensure your development server is running:

```bash
npm run dev
```

Visit `http://localhost:3000` in your browser to see the CRUD functionality in action.

### Conclusion:

This example demonstrates a basic implementation of CRUD functionality using Redux Toolkit and Redux Toolkit Query. Adapt the code to suit your specific use case, and consider adding additional features such as form validation, error handling, and confirmation dialogs based on your application requirements.