[eluser]sl3dg3hamm3r[/eluser]
Ok, here comes some really constructed example. Let's say you have a table 'Country' with two columns 'Id' and 'Code' (aka country-code). This example is now little bit overcomplicated, but I think I would do something similar in your case:
Code:
<?php
/*
* Created on 14.01.2010
*
* To change the template for this generated file go to
* Window - Preferences - PHPeclipse - PHP - Code Templates
*/
class Mdl_country extends Model implements Iterator {
private $query = null; // Sql-query result array
private $position = 0; // Pointer for Iterator
public function __construct()
{
parent::__construct();
}
/**
* Loads data into var
*/
public function loadData()
{
$this->query = $this->db->get('Country');
$this->query = $this->query->result_array();
}
/**
* HERE IS DEFINED SOME SPECIAL BUSINESS-LOGIC: IF THE CODE IS 'CH', EMPHASIZE IT!
*/
public function getCode()
{
$field = $this->query[$this->position]['Code'];
if ($field == 'CH')
return "CH ROCKS!";
return $field;
}
// Iterator-Interface
function rewind() {
$this->position = 0;
}
// Iterator-Interface
function current() {
return $this->query[$this->position];
}
// Iterator-Interface
function key() {
return $this->query[$this->position];
}
// Iterator-Interface
function next() {
++$this->position;
}
// Iterator-Interface
function valid() {
if ($this->query != null && isset($this->query[$this->position]))
return true;
return false;
}
}
In the controller (this should be done in a view, but for the sake of having it simple:
Code:
function index()
{
$this->load->model('mdl_country', '', true);
$this->mdl_country->loadData();
foreach($this->mdl_country as $row)
echo $row['Id'] . ": " . $this->mdl_country->getCode() . '<br />';
}
As you can see, in order to print the country-code, I ask a specialised method 'getCode()'. In there I check what is written in the field and slightly modify it if a given rule matches.
In your case this method could be called 'getPrice()', where you could implement your own logic (if field is null, take another one etc.).
The advantage: Data and behaviour is kept together within one class. The view won't need to know any logic. You would just call the method(s) of your class, the rest is done there.
