9. How do you integrate RTK Query’s API reducer into the store?

Integrating RTK Query API Reducer into the Redux Store

When using RTK Query, each API slice you create using createApi() generates a reducer and middleware that must be integrated into your Redux store. This integration allows RTK Query to manage cache, request state, and automatic data updates.

Steps to Integrate RTK Query into the Store

1. Import the API Slice: Import the API slice you created using createApi().
2. Add the API Reducer: Include the generated api.reducer under a key that matches api.reducerPath inside the reducer field of configureStore().
3. Add the API Middleware: Append api.middleware to the default middleware chain.

Example: Integrating RTK Query API Reducer and Middleware

This configuration ensures that RTK Query can handle caching, data fetching, and updates efficiently by maintaining its internal state in the Redux store.

Important Notes

- Unique Reducer Path: Always use api.reducerPath as the key name to avoid conflicts with other reducers.
- Middleware Order: Ensure api.middleware is appended (not replaced) so default middleware like thunk still runs.
- Supports Multiple APIs: You can integrate multiple APIs by repeating the reducer and middleware inclusion for each.

Example: Multiple RTK Query APIs in One Store

By properly integrating RTK Query’s reducers and middleware, your store becomes capable of handling advanced data fetching and caching mechanisms with minimal boilerplate.

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