A quick intro to mvc


mvc in a nutshell

   CODE REUSABILITY
SEPARATION OF CONCERNS

  • MODEL - The 'things' in the program containing all of the business rules, logic, and functions. (User, Dataset)
  • VIEW - The user interface, or point of interaction with the program.
  • Controller - Mediates input and dispatches commands to the model or view.



all together


the model

  • Models are the 'things' in our programs 
  • Often represented by classes or class-like objects
  • Often persisted to a database


class User extends Eloquent {    protected $table = 'users';    ... more User code ...
}

models continued

The ORM
Most MVC frameworks provide an ORM, or Object Relational Mapper to make storing and retrieving models in the database easier. 

Codeigniter has no built-in ORM so......
We use 'Eloquent' to do things like 
$users = User::all();
$user = User::find(1);

the view

AKA User Interface, UI, GUI, Front-end, HCI (human computer interface) among others.

Just  HTML + Mix of PHP


<html>
 <body>
   <h1>     Hello, <?php echo $user->name; ?>   </h1>
 </body>
</html>

Advanced view

codeigniter (plain php)

  <h1><?php echo $heading;?></h1>

  <h3>My Todo List</h3>

  <ul>
    <?php foreach ($todo_list as $item):?>

    <li><?php echo $item;?></li>

    <?php endforeach;?>
  </ul>

Advanced view

Laravel

@for ($i = 0; $i < 10; $i++)
    The current value is {{ $i }}
@endfor

@foreach ($users as $user)
    <p>This is user {{ $user->id }}</p>
@endforeach

@while (true)
    <p>I'm looping forever.</p>
@endwhile

SO


Models hold the data/logic about our program.

Views show this data to the users of the program.

How do we glue the models and views together?

The Controller

Basically a class file that is named so that it can be accessed by a URL
example: http://website.com/user/name
<?php
  class User extends My_Controller {

    public function name()
    {      // Find user model using Laravel ORM      $user = User::find(1);      // Control some other stuff.      // Respond with view.    }
  }
?>

Controllers irl

http://mocavo.com/[Class.php]/[#function]

/order
 order.php -> Order class -> #index

/auth/logout
auth.php -> Auth class -> #logout

/order/thank_you
order.php -> Order class -> #thank_you

codeigniter controller/view

website.com/user
<!-- application/controllers/user.php -->
Class User extends My_Controller {  public function index() {    $data = array($name => 'darrell');    $this->load->view('greeting', $data);  }}<!-- application/views/greeting.php -->
<html>
  <body>
    <h1>Hello, <?= $name; ?></h1>
  </body>
</html>

Laravel Controller/View

website.com/user
<!-- app/controllers/greeting.php -->
Route::get('/user', function()
{  $data = array($name => 'Darrell');
  return View::make('greeting', $data);
});
<!-- app/views/greeting.php -->
<html>
  <body>
   <h1>Hello, <?php echo $name; ?></h1>
  </body>
</html>






Questions?

A Quick Intro To MVC

By hacknightly

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A Quick Intro To MVC

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