Calling library method inside model error (with solution)

Hi everyone,
I was spent a lot of time solving this situation in a my current project and I would like to share with all of you this solution to whom may help. 
It's a matter of calling a class method from model method called from a constructor without class being completely loaded. Probably Too trivial.. and for beginners but.. we do not always have a good day 

Suppose we have this case: 
(I apologize about wrong code, capitals, etc.. I have rewritten this code without testing it, but making it similar and removing useless information from my current project)


Controller mycontroller
-------------------------

Code:

class mycontroller extends CI_Controller() {
 function __construct() {
   parent::__construct();
   $this->load->library("folder/mylibrary");
 }
}

library mylibrary
-----------------

Code:

protected $obj;
class mylibrary() {
 function __construct() {
   $this->obj =& get_instance();
   $this->obj->load->model("folder/mymodel");
   $this->obj->load->library("folder/mysecondlibrary");
 }
}

library mysecondelibrary
-------------------------

Code:

class Mysecondlibrary{

 protected $obj;

function __construct() {
$this->obj = & get_instance();
$this->obj->mymodel->mymodelmethod();
}

function mymethod() {
return true;
}
}

model mymodel
-----------------

Code:

class Mymodel extends CI_Model {
        
    function __construct() {
        parent::__construct();
    }

   function mymodelmethod() {
       $this->mysecondlibrary->mymethod(); /* This crash: Undefined property: Mycontroller :: mylibrary Filepath: system\core\Model.php, [..]
   }
}

If we call a library method from model method which it was called from a library constructor class this will crash. We need to call method after
libraries are loaded.

To solve this, we need to call a class init method after loading.

library mylibrary
-----------------

Code:

protected $obj;
class mylibrary() {
 function __construct() {
    $this->obj =& get_instance();
    $this->obj->load->model("folder/mymodel");
    $this->obj->load->library("folder/mysecondlibrary");

    /** ADDED */
    $this->mysecondelibrary->init();
 }
}

library mysecondelibrary
-------------------------

Code:

class Mysecondlibrary{

  protected $obj;

  function __construct() {
    $this->obj = & get_instance();
   /** Mymodel Method call removed */
  }

  /** ADDED */
  function init() {
    $this->obj->mymodel->mymodelmethod();
   }

  function mymethod() {
    return true;
  }
}

Whats the reason why you are loading the second library into the first one? Wouldn't it be better to:

PHP Code:

class Mysecondlibrary extends Mylibrary 


That way, you can call methods in Mylibrary through $this->mysecondlibrary->

Whats the reason why you are loading the second library into the first one? Wouldn't it be better to:

PHP Code:

class Mysecondlibrary extends Mylibrary 


That way, you can call methods in Mylibrary through $this->mysecondlibrary->

Thanks for your contribution, in this case I am using mylibrary only to load all libraries, methods, helpers into the memory but mylibrary has no methods or variables that I can use from mysecondlibrary.

Hello,

you can call methods in My library through $this->mysecondlibrary->
class Mysecondlibrary extends My library

<?php
class Blog extends CI_Controller {

public function index()
{
echo 'Hello World!';
}
}

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