design pattern (4)


MVC in Laravel – Part 3

* Bug fix

Before continue, please change your config/database.php and change your line 38 to:

Now you have your database with some records that I supposed that you been added, you have a Model and connection to database (SQLite) but you don’t have a Controller and View.

Let’s do that!

Firstly, we need a controller

Now look the file  app/HTTP/Controllers/NewsController.php

When we use –resource parameter in artisan make:controller Laravel creates the needed methods with comments for us.

Well, in this case we only use the index method. So, you can remove the others.

Now we have a controller but, we don’t defined a route and view.

Defining the route

Start by defining the route. Remember, the HTTP Requests are requesting something to application and your application will send something to user, these paths or ways are called as routes and will be defined on your routes/web.php

In routes/web.php we need to add a Route to listen verb GET and search for a path and associates it to a controller, how we do that? simple add it to your route/web.php file .

Now when some one request for /news path, the application defines that route is associated to NewsController AT index method.

Use php bult-in server to test it

Well, if you visit your http://127.0.0.1:8000/news you don’t see any error, however you can see that a blank page was returned to us. We need the news not a blank page. Relax, it’s because we don’t returned any view or response.

But, how we could get ALL the News from your database and pass it to a view ?

Simple, the model has a static method called all!!! 🙂

For a while your controller may be like it

Now you can see something similar to it at the page.

dd()

The dd function dumps the given variables and ends execution of the script:

That’s cool, but we still need to pass it to a view!

Create the news.index view

Create a new file resources/views/news/index.blade.php

Note .blade.php means that it is a view and will use the Blade. Blade is the default template engine of Laravel.

Remember in controller you can use the helper view(). The first argument is the name of view but you don’t need to specifies the full extension if you’re using the standards. Simple use view(‘news.index’) the function will understand that you are looking for folder news and view index.blade.php.

Are many ways to pass data to your views, but we will see it after. For now you can use a second argument of function, it receives a array of your data.

Here’s your final NewsController.php

After it, your view receives the $news with the collection that we saw before.

Here’s your news/index.blade.php view file

Note, the @foreach and @endforeach are directives of Blade.

Done!!!

Well, is it. It’s done, now you understand how Laravel applies the MVC.

Other parts of it demonstration




MVC in Laravel – Part 2

Still talking about routes

Behind every request has a pre-defined route for it action.

Laravel uses the HTTP Verbs in your routes, however by default HTML forms do not support PUT, PATCH or DELETE actions. To get around you will need to add a hidden _method field to the form.

Let’s see the default actions of a resource controller

Back to our default example

We will create a simple page with news from database to demonstrate how it works. In future we will see more about each topic of this first example, remember it’s only to demonstrates how is MVC in Laravel. Don’t focuses on little details because we will review each topic with more details.

Artisan the power of console

Some tasks in development are repetitive and boring, it’s cool have I friend in these times, yes we have, it’s artisan, the command-line interface included with Laravel. It provides a number of helpful commands that can assist you while you build your application.

Type php artisan in your application root directory to see a lot of commands that you can do with it.




MVC in Laravel

If you didn’t read the previous post about Directory Structure in Laravel, you may be thinking that Laravel have specific folders for each layer in MVC, but isn’t like that.

To try to explain how the MVC works in Laravel we will do little and basic CRUD application together.

Getting started

To understand more about MVC in Laravel, we need to install a fresh installation of Laravel, let’s do it

Only to remember, we are creating a new project ( laravel/laravel ) in folder laravel with default params.

To certify that everything goes right, start server in your terminal with artisan. Type the command below in the laravel folder in your terminal.




A break in Laravel to understanding MVC architecture

Why MVC Design pattern?

The Model-View-Controller (MVC) software architectural pattern separates an application into three main logical components: the model, the view, and the controller, it design pattern decouples these major components allowing for efficient code reuse and parallel development.

How MVC Works?

Think in these logical components as layers of your application.