/**
* Creates an ActionParam with the given attributes and adds it to the action.
*
* @param Action $action
* @param string $key
* @param string $type
* @param string $value
* @return ActionParam
*/
protected final function createActionParam(Action $action, $key, $type = NULL, $value = NULL)
{
// fill array for action param creation
$actionParamAttributes = ['key' => $key, 'value' => $value, 'type' => $type];
$actionParam = new ActionParam($actionParamAttributes);
// add action param to action
$action->actionParams()->save($actionParam);
return $actionParam;
}