[JITERA] Add PATCH /books/:id endpoint for partial updates

Created by: chi-jitera

Overview

This pull request introduces a new endpoint to allow partial updates of book records via a PATCH request. The new functionality is implemented in the bookRoutes.js and bookController.js files, along with necessary changes in the bookService.js to handle the update logic.

Changes

1. Updated bookRoutes.js:

   • Added a new route for the PATCH method to handle requests to /books/:id.
   • This route maps to the patchBook method in the bookController.

   // routes/bookRoutes.js
   router.patch('/books/:id', bookController.patchBook);

2. Implemented patchBook method in bookController.js:

   • Created the patchBook method to handle the logic for updating book records.
   • The method validates the input and updates only the fields provided in the request body.

   // controllers/bookController.js
   async patchBook(req, res) {
       const { id } = req.params;
       const updates = req.body;
       // Validate and update logic here
   }

3. Updated bookService.js:

   • Implemented the patchBook method to perform the actual update in the database.
   • Ensured that only the fields present in the request body are updated.

   // services/bookService.js
   async patchBook(id, updates) {
       // Logic to update the book in the database
   }

This new functionality will enhance the API by allowing clients to update only specific fields of a book without needing to send the entire book object.