[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 ensures that only the fields provided in the request body are updated, adhering 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); // Add PATCH route for partial update
   router.patch('/books/:id', bookController.patchBook);
   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 now allows for partial updates to book records, updating only the fields sent in the request body.
• The implementation includes validation for the publishedYear field and returns the updated book object or relevant error codes (400/404) as needed.
• No authentication is required for this endpoint as per the documentation.