MVC Architecture in Node.js

Model-View-Controller (MVC) Overview

Model-View-Controller (MVC) Overview

• Model : Responsible for maintaining data. Handles data logic and communicates with the database.

• View : Responsible for data representation. Generates the user interface (UI) for the user. Communicates only with the controller, not directly with the model.

• Controller: Acts as an intermediary between the view and the model. Handles user input and interaction, updating the model and view as necessary.

Updating a Function in MVC Node.js

• Update EJS Template (home.ejs):

<form action="/book/<%= book.id %>?_method=DELETE" method="POST">
    <button type="submit">Delete</button>
</form>

Update Backend Controller (homeControllers):

deleteBook: (req, res) => {
    const { id } = req.params;
    Book.deleteBook(id);
    res.redirect('/');
},

Modify Book Model (models/book.js):

static deleteBook(id) {
    const index = books.findIndex((book) => book.id === id);
    if (index !== -1) {
        books.splice(index, 1);
    }
}

Configure Route for Delete Operation (routes/home.js):

// Delete a book
router.delete('/book/:id', homeControllers.deleteBook);
Use Method-Override for DELETE:
bash
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npm install method-override
Update your server setup (server.js):
javascript
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import methodOverride from 'method-override';

// Set up method-override middleware
app.use(methodOverride('_method')); 

Node.js Core Modules and APIs

events Module Provides EventEmitter objects used to assign listener functions triggered on specified events.

Buffer Object Represents a static amount of memory that can’t be resized.

Methods: .alloc(size, fill): Creates a buffer of specified size filled with the given value. .toString(): Converts the buffer content to a string. .from(): Creates a buffer from a specified string, array, or another buffer. .concat(): Joins all buffers in the specified array into one buffer.

timers Module Contains scheduling functions such as setTimeout(), setInterval(), and setImmediate().

setImmediate() Executes the specified callback function after the current event loop has completed.