Model within a model

Hi, In general, I call models from controllers. However, here is an example where I've called Customers model from Orders model. Hope this helps.

Models/BaseModel.php

PHP Code:

<?php

namespace App\Models;

use CodeIgniter\Model;

class BaseModel extends Model
{
  protected $db;

  protected function __construct()
  {
    $this->db = \Config\Database::connect();
  } 


Models/Customers.php

PHP Code:

<?php

namespace App\Models;

use App\Models\BaseModel;

class Customers extends BaseModel
{
  protected $fields;

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

  public function getCustomer(int $customerId)
  {
    $builder = $this->db->table('customers c');
    $query = $builder->select($this->fields['customers-all'])->where('c.id', $customerId)->get();
    return $query->getRowArray();
  } 


Models/Orders.php

PHP Code:

<?php

namespace App\Models;

use App\Models\BaseModel;

class Orders extends BaseModel
{
  protected $orderTable;
  protected $selectFields;

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

  public function getOrder(int $orderId)
  {
    $c = new \App\Models\Customers;

    $query = $this->orderTable->select($this->selectFields['all'])->where('o.id', $orderId)->get();

    $order = $query->getRowArray();
    if (!$order) {
      return ['order' => $order];
    }

    $orderItems = $this->getOrderItems($orderId);
    $customer = $c->getCustomer($order['customer_id']);
    $address = $c->getAddress($order['address_id']);