How to load Model outside Controller in OpenCart

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It is only one method that you need to copy, you would be best adding a method to the Cart class itself. The Cart class will work with the $this->db->query() calls as it already has $db assigned to it even though it is not a Controller/Model. In this post we have share load Model outside Controller in OpenCart.
Should you wish to do this, you could do something similar to the following: 
model('catalog/product');
    $model = $registry->get('model_catalog_product');
    $result = $model->getProduct(333);
}
?>