• In CodeIgniter, the Model is used for the Database manipulation – fetch, insert, update, and delete records.
• If within the project there are multiple Models are available then it may require to perform the action during a Model which is already created in another Model.
• In this case, you’ll either create a separate function to perform an equivalent action or use the already available method within the Model.
• It is possible to reuse the method in the Model from another Model.
• Models are loaded within the Model as same as loaded within the Controller using $this->load->model().
• Create Three Models and call 1st and 2nd Model methods from the 3rd Model.

1.Configuration

Default controller

Open application/config/routes.php and edit default_controller value to User.

$route[‘default_controller’] = ‘User’;

2.Model 1 : Call Model method from another Model

Create a new Model_1.php file in application/models/ directory.

Create two methods

1. fun1()
2. fun2()

 which returns string text.

Code

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

Class Model_1 extends CI_Model {

public function fun1(){
return "Model_1 fun1";
  }

public function fun2(){
return "Model_1 fun2";
  }

}

3.Model 2 : Call Model method from another Model

Create a new Model_2.php file in application/models/ directory.

Create two methods

1. fun1()
2. fun2()

 which returns string text.

Code

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

Class Model_2 extends CI_Model {

public function fun1(){
return "Model_2 fun1";
  }

public function fun2(){
return "Model_2 fun2";
  }

}

4.Model 3 : Call Model method from another Model

Create a new Model_3.php file in application/models/ directory.

In this Model, I loaded 2 Models – Model_1 and Model_2 and access their methods.

• Syntax – Load and Access Model

$this->load->model(‘Model_name’); // Load Model

$this->Model_name->method_name(); // Access Method

• Load Models

__construct – Load Model_1 and Model_2 using $this->load->model().

• Access Two methods

fun1 – Call fun1() method of Model_1 $this->Model_1->fun1() and assign response in $response Array. Similarly call fun1() method of Model_2 $this->Model_2->fun1() and assign to $response Array.

Return $response.

• Access Single method

fun2 – Call fun2() method of Model_2 $this->Model_2->fun2() and assign response in $response Array

Return $response.

Code

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

Class Model_3 extends CI_Model {

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

    // Load Models - Model_1 and Model_2
    $this->load->model('Model_1');
    $this->load->model('Model_2');
  }

public function fun1(){

    // Access Two model methods and assing response to Array
    $response[] = $this->Model_1->fun1();
    $response[] = $this->Model_2->fun1();

    $response[] = "Model_3 fun1";

return $response;
  }

public function fun2(){

    // Access single Model method and assign response to Array
    $response[] = $this->Model_2->fun2();

    $response[] = "Model_3 fun2";
return $response;
  }

}

5.Controller

• Create a new User.php file in application/controllers/ directory.
• Load Model_3 Model and call fun1() and fun2() methods.
• Print the response.

Code

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class User extends CI_Controller {

public function __construct(){

    parent::__construct();

    // Load model
    $this->load->model('Model_3');
  }

public function index(){

    // Call fun1() method of Model_3
    $response1 = $this->Model_3->fun1();
echo "<pre>";
print_r($response1);
echo "</pre>";

    // Call fun2() method of Model_3
    $response2 = $this->Model_3->fun2();
echo "<pre>";
print_r($response2);
echo "</pre>";

  }

}

6.Output

It gives the following output