[JITERA] Implement PATCH /books/:id for partial updates to book records

Created by: chi-jitera

Overview

This pull request implements the PATCH /books/:id endpoint in the Express backend to allow partial updates to book records. The implementation adheres to the specifications outlined in the API documentation.

Changes Made

1. Updated Book Model:

   • Modified /models/book.js to include the missing fields publishedYear (Number, required) and available (Boolean, default true) in the Book schema.

   const mongoose = require('mongoose');
   
   const bookSchema = new mongoose.Schema({
       title: { type: String, required: true },
       author: { type: String, required: true },
       publishedYear: { type: Number, required: true }, // Correction: use publishedYear
       genre: { type: String, required: true },
       available: { type: Boolean, default: true } // New field for availability
   });
   
   const Book = mongoose.model('Book', bookSchema);
   module.exports = Book;

2. Added PATCH Route:

   • Registered the PATCH /books/:id route in /routes/bookRoutes.js, pointing to the patchBook method in the book controller.

   const express = require('express');
   const bookController = require('../controllers/bookController');
   const router = express.Router();
   
   router.post('/books', bookController.createBook);
   router.get('/books', bookController.getAllBooks);
   router.get('/books/search', bookController.searchBooks);
   router.get('/books/:id', bookController.getBookById);
   router.put('/books/:id', bookController.updateBook);
   router.patch('/books/:id', bookController.patchBook); // Add PATCH route for partial update
   router.delete('/books/:id', bookController.deleteBook);
   
   module.exports = router;

3. Controller and Service Verification:

   • Verified that the existing patchBook method in /controllers/bookController.js and the corresponding service method in /services/bookService.js correctly handle the PATCH request as per the document specifications. No additional changes were necessary for these files.

Summary

• The PATCH /books/:id endpoint will now update only the fields sent in the request body and validate the publishedYear field.
• It returns the updated book object or relevant error codes (400/404) as needed.
• No authentication is required for this endpoint as per the documentation.