Laravel 5.1 : argument or values not readable by Query Builder

so this is my route.php

Route::get('tempitems/{tempId}/add/{q?}', 
['uses' => 'ItemTemplateController@addItems', 'as' => 'tempitems.add']);

this is the addItems method

public function addItems(Request $request, $tempId)
{
 echo ($tempId) // 1 st echo

 $temp = DB::table('auto_items')
            ->join('items', 'auto_items.item_id', '=', 'items.id')
            ->select(
                'items.name',
                'auto_items.qty'
                )
            ->where('auto_items.template_id', '=' , 1)
            ->tosql();

  dd($temp);

  echo $tempId; // 2nd echo

  return view('template_items.add_items', [
      'active'    => $this->active,
      'items'     => $items,
      'template'  => $template,
      'page'      => $page,
      'success'   => $success,
      'tempItems' => $tempItems
    ]);  
}

the problem is the query builder cannot read the $tempId when i accessed : localhost:8000/tempitems/1/add

1st echo => return 1
dd return => 
"select `items`.`name`, `auto_items`.`qty` from `auto_items` inner join `items` on 
`auto_items`.`item_id` = `items`.`id` where `auto_items`.`template_id` = ?"

2nd echo returned 1

by the way, i know that Query Builder use get() to return rows, because of it returned zero array / [ ] , thats why im using toSql(). but the point is the $tempId cannot be read by the QueryBuilder.

Any help is appreciated thanks .

via Chebli Mohamed