/**
* Show the form for editing the specified resource.
*
* @param int $id
* @return Response
*/
public function edit($id)
{
//
$categories = $this->content->meta();
$article = $this->content->edit($id, 'article');
//已经findOrFail处理，如果不存在该id资源会抛出异常，再加is_null判定无意义
//is_null($article) and abort(404);
$flags = $this->flag->index();
return view('back.article.edit', ['data' => $article, 'categories' => $categories, 'flags' => $flags]);
}
