Extending HMVC modules in CodeIgniter

Question

Let's say we have module called core_crud with something like this in the controller:

if (!defined('BASEPATH'))
    exit('No direct script access allowed');

class Core_crud extends MX_Controller
{

    function __construct()
    {
        parent::__construct();
        $this->load->model('mdl_core_crud');
    }

    public function index()
    {
        // code goes here
    }

}

And now I want to extend this module with another module called shop_crud. How would the basic controller for this shop_crud module look like? I mean I want to inherit all the controller methods from core_crud and all the model stuff too.

Answer 1

Structure of the Modules

/modules
    /core_crud
        /controllers
            /core_crud.php
        /models
        /views
    /shop_curd
        /controllers
            /shop_crud.php
        /models
        /views

Code in core_crud.php

<?php

if (!defined('BASEPATH'))
    exit('No direct script access allowed');

class Core_crud extends MX_Controller
{

    function __construct()
    {
        parent::__construct();
        $this->load->model('mdl_core_crud');
    }

    public function index()
    {
        // code goes here
    }

    public function mymethod($param1 = '', $param2 = '')
    {
        return 'Hello, I am called with paramaters' . $param1 . ' and ' . $param2;
    }

}

Code in shop_crud.php

<?php

if (!defined('BASEPATH'))
    exit('No direct script access allowed');

class Shop_crud extends MX_Controller
{

    public function __construct()
    {
        parent::__construct();
        //$this->load->model('mdl_shop_curd');
    }

    public function testmethod()
    {
        // output directly
        $this->load->controller('core_crud/mymethod', array('hello', 'world'));

        // capture the output in variables
        $myvar = $this->load->controller('core_crud/mymethod', array('hello', 'world'), TRUE);
    }

}

So instead of extending the whole module/controller I prefer just to call the method which is required. It is simple and easy too.

Note If module name and controller name are different then you have to pass the path

module_name/controller_name/mymethod

EDIT to support EXTENDS

File structure

The code in core_crud.php.

if (!defined('BASEPATH'))
    exit('No direct script access allowed');

class Core_crud extends MX_Controller
{

    public function __construct()
    {
        parent::__construct();
        $this->load->model('core_crud/mdl_core_crud');
    }

    public function index()
    {
        return 'index';
    }

    public function check_method($param1 = '')
    {
        return 'I am from controller core_crud. ' . $this->mdl_core_crud->hello_model() . ' Param is ' . $param1;
    }

}

The code in mdl_core_crud.php

if (!defined('BASEPATH'))
    exit('No direct script access allowed');

class mdl_core_crud extends CI_Model
{

    public function hello_model()
    {
        return 'I am from model mdl_core_crud.';
    }

}

The code in shop_crud.php.

if (!defined('BASEPATH'))
    exit('No direct script access allowed');

include_once APPPATH . '/modules/core_crud/controllers/core_crud.php';

class Shop_crud extends Core_crud
{

    public function __construct()
    {
        parent::__construct();
    }

    public function index()
    {
        echo parent::check_method('Working.');
    }

}

Output :- I am from controller core_crud. I am from model mdl_core_crud. Param is Working.

Hope this helps. Thanks!!