public function search(Request $request, $category_id)
{
$term = $request->input('q');
$items = App\Item::whereHas('categories', function ($q) use($category_id) {
$q->where('id', '=', $category_id);
})->where('name', 'like', '%' . $term . '%')->orderBy('name')->get();
return response()->json($items);
}