public function __construct()
 {
     parent::__construct();
     $this->submenu = Navigation::submenu('inventory');
     // Registering unique category validator
     Validator::register('cat_exists', function ($attribute, $value, $parameters) {
         if ($value == 'null') {
             return true;
         }
         $category = DB::table('categories')->where_id($value)->first();
         if ($category !== null) {
             return true;
         }
     });
     // Registering unique item code validator
     Validator::register('code_unique', function ($attribute, $value, $parameters = array()) {
         $id = !empty($parameters) ? $parameters[0] : null;
         $existing_item = DB::table('items')->where_code($value)->first('code');
         if ($existing_item !== null) {
             if ($id === null) {
                 return false;
             }
             $current_item = DB::table('items')->where_id($id)->first('code');
             if ($current_item->code == $value) {
                 return true;
             }
         } elseif ($existing_item == null) {
             return true;
         }
     });
 }
 /**
  * Construct
  */
 public function __construct()
 {
     parent::__construct();
     $this->submenu = Navigation::submenu('inventory');
     // Generating buttons
     $this->item_buttons = Navigation::item_buttons()->add_item_button(array('icon' => 'icon-plus-sign', 'link' => 'contact@add', 'text' => __('site.add_contact')))->get_item_buttons();
 }
 /**
  * Construct
  *
  * @return  void
  */
 public function __construct()
 {
     parent::__construct();
     $this->submenu = Navigation::submenu('report');
 }
 /**
  * Construct
  */
 public function __construct()
 {
     parent::__construct();
     $this->submenu = Navigation::submenu('inventory');
 }
 /**
  * Construct
  */
 public function __construct()
 {
     parent::__construct();
     $this->submenu = Navigation::submenu('transactions');
 }