Implementing a factory pattern in the Model Layer of CI

[eluser]titoneo[/eluser]
Class product as "product.php" in Model folder...

Code:

class Product extends Model
{
....function setName();
....function getName();
....function setPrice();
....function getPrice();

}

Class Shop1Product as "shop1product .php" in Model folder...

Code:

require_once("product.php");

class Shop1Product extends Product{


}

in the controller...

Code:

$this->load->model("shop1product");