Call multiple application models from a shared site in a single installation of Codeigniter 4

Question

How to call models from other multi-application sites in a single installation of Codeigniter 4?

The folder structure looks like this:

- WebsiteFolder
  --Site1
     ---app
     ---public
     --- tests
     --- writeable
     (.env, spark and other files)
  --Site2
     ---app
     ---public
     --- tests
     --- writeable
     (.env, spark and other files)
  -- system

Here is my sample code:

At site 1

---

Constants.php I have defined a root directory to locate site2.

define('ROOTSOURCE', dirname(__DIR__,3) . '\site2');

This returns:

E:\Project\website\site2

Autoload.php

I have set up PSR4.

public $psr4 = [
        APP_NAMESPACE => APPPATH, // For custom app namespace
        'Config' => APPPATH . 'Config',
        'Source\Models' => ROOTSOURCE . '/app/Models/'
    ];

Then I run the SPARK command:

php spark namespaces

and return

 --------------- ------------------ -------------------------------------------------- --------------------- --------
| Namespace | Path | Found? |
 --------------- ---------------------------------- -------------------------------------------------- ---- --------
| CodeIgniter | E:\Project\DennisLiu\website\system | Yes |
| App | E:\Project\DennisLiu\website\site1\app | Yes |
| Config | E:\Project\DennisLiu\website\site1\app\Config | Yes |
| Source\Models | E:\Project\DennisLiu\website\site2\app\Models | Yes |
 --------------- ---------------------------------- -------------------------------------------------- ---- -------- 

Then find the namespace Source\Models. So far so good.

Controller=> Home.php

namespace App\Controllers;
use Source\Models;


class Home extends BaseController
{
    public function index()
    {
        
        $setting = new \Source\Models\Setting();

        return view('welcome_message');
        
    }

When I run the controller I get:

Class 'Source\Models\Setting' not found

Next step,

At site 2

I have the modelSettings in the Site2 models folder.

Note:

Everything is working fine in Site 2.

My problem is that I get the error "Class "Source\Models\Setting"" not found"The correct settings for calling site 2 models in a single application installation of codeigniter 4 are What? . < /p>

Note: This is a single installation of codeigniter 4 for both websites. I shared the system folder.

Answer 1

You can access the model in a class by creating a new instance or using the model() helper function.

Examples like this

// Create a new class manually
$userModel = new \App\Models\UserModel();

// Create a new class with the model function
$userModel = model('App\Models\UserModel', false);

// Create a shared instance of the model
$userModel = model('App\Models\UserModel');

Answer 2

I found the problem. This is the correct way to do this.

Folder structure

- WebsiteFolder
  -- Site1
     --- app
     --- public
     --- tests
     --- writeable
     (.env, spark and other file)
  -- Site2
     --- app
     --- public
     --- tests
     --- writeable
     (.env, spark and other file)
  -- shared/Models
     (DBSetting.php)
  -- system

Controller - Home.php

namespace App\Controllers;
use shared\Models\DBSetting;



class Home extends BaseController
{
    public function index()
    {                
        
        $db = new \shared\Models\DBSetting();                

        return view('welcome_message');
        
    }
}

Autoload.php

public $psr4 = [
        APP_NAMESPACE   => APPPATH, // For custom app namespace
        'Config'        => APPPATH . 'Config',               
        'shared\Models' => ROOTSOURCE . '/shared/Models'        
    ];

Constants.php

define('ROOTSOURCE', dirname(__DIR__,3));

DBSetting.php

Namespace Sharing\Model; Using CodeIgniter\Model;

Class DBSetting extended model{

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


public function save() {    
    return true;
}

}

We can also call the model in site 2. Just set the correct path in Autoload.php to reference the model in site 2.

Notice: If a model in site 2 contains another model or link, if we call from site 1, the codeigniter 4 system will read the link, model from site 1. So make sure to call the normal model in site 2. Or just create a shared model folder as above.