thetool/application/Product/Product.php

<?php

class Product extends mfBaseModel {
  private $productgroup;
  private $producttech;
  private $sla;
  private $networks;

  public function getProperty($name) {
    if($this->$name == null) {
      
      if($name == "networks") {
        $this->networks = [];
        $productNetworks = ProductNetworkModel::search(['product_id' => $this->id]);
        foreach($productNetworks as $pnet) {
          $this->networks[$pnet->network_id] = new Network($pnet->network_id);
        }
        return $this->networks;
      }
      
      
      
      $classname = ucfirst($name);
      $idfield = $name."_id";
      $this->$name = new $classname($this->$idfield);
      
      if($this->$name->id) {
        return $this->$name;
      } else {
        return null;
      }
    }
    
    return $this->$name;
  }
}