[JITERA] Implement PATCH /books/:id API for Partial Book Updates

Created by: chi-jitera

Overview

This pull request implements the PATCH /books/:id API endpoint, allowing for partial updates of book information. The implementation ensures that if a book does not exist, a 404 error is returned, and for validation errors, a 400 error is returned.

Changes

1. Controller Implementation:

   • In /controllers/bookController.js, the patchBook function has been defined. This function calls bookService.patchBook to handle the logic for updating book information.
   • Error handling has been added to return appropriate status codes based on the type of error encountered (404 for not found, 400 for validation errors).

   exports.patchBook = async (req, res) => {
       try {
           const book = await bookService.patchBook(req.params.id, req.body);
           res.json(book);
       } catch (error) {
           const status = error.message === 'Book not found' ? 404 : 400;
           res.status(status).json({ error: error.message });
       }
   };

2. Route Definition:

   • In /routes/bookRoutes.js, the route for the PATCH method has been defined to link the endpoint to the patchBook controller function.

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

This implementation allows clients to send a PATCH request to update specific fields of a book, enhancing the API's functionality and usability.