Load model in Library

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public function __construct($registry) {
		$this->config = $registry->get('config');
		$this->db = $registry->get('db');
		$this->request = $registry->get('request');
		$this->session = $registry->get('session'); 
		$this->load = $registry->get('load');

		$this->detectEnviroment();
	}

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$this->load->model($this->environment . '/shipping_list');
$this->load->model_checkout_shipping_list->updateStock($products);

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public function __construct($registry) {
   $this->config = $registry->get('config');
   $this->db = $registry->get('db');
   $this->request = $registry->get('request');
   $this->session = $registry->get('session');
   $this->load = $registry->get('load');

   $this->load->model('checkout/shipping_list'); // i think in your case the model is in your checkout folder.

   //after that load the model using the "$registry".
   $this->model = $registry->get('model_checkout_shipping_list');
}

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$this->model->updateStock($products);