public function update(Article $article, ArticleRequest $request)
{
// auto validate from rules in ArticleRequest
// if pass go here
//$article = Article::findOrFail($id);
$article->update($request->all());
//$article->tags()->detach();
//$article->tags()->sync($request->input('tag_list'));
$this->synTags($article, $request->input('tag_list'));
return redirect('article');
}
