thetool/application/Producttech/Producttech.php

<?php

class Producttech extends mfBaseModel {
  private $attributes;
  
  public function getProperty($name) {
    if($this->$name == null) {
      
      if($name == "attributes") {
        $this->attributes = [];
        $producttechAttributes = ProducttechAttributeModel::search(['producttech_id' => $this->id]);
        foreach($producttechAttributes as $pta) {
          $this->attributes[$pta->id] = $pta;
        }
        return $this->attributes;
      }
      
      
      $classname = ucfirst($name);
      $idfield = $name."_id";
      $this->$name = new $classname($this->$idfield);
      
      if($this->$name->id) {
        return $this->$name;
      } else {
        return null;
      }
    }
    
    return $this->$name;
  }
}