protected function getList()
 {
     if ($this->request->has('category')) {
         $categoryId = $this->request->input('category');
         /** @var Category $category */
         $category = Category::findOrFail($categoryId);
         $this->pageTitle = ' Stickers in ' . $category->name;
         $this->breadcrumbs = \Breadcrumbs::render('category-stickers', $category);
         return Sticker::where('categoryId', $categoryId)->orderBy('name');
     } else {
         return Sticker::orderBy('name');
     }
 }
 protected function getInstance($id)
 {
     return Category::findOrFail($id);
 }