/**
* add the given menu item category to the repository
* please note that this is a private method to be used only by the constructor
* @param MenuCategory $category
*/
private function addMenuCategory(MenuCategory $category)
{
// obtain ID from the menu category object
$id = $category->getMenuCategoryCode();
//add menu category object to the array, with index of the ID
$this->categories[$id] = $category;
}