/**
  * Update the specified resource in storage.
  *
  * @param  int  $id
  * @return Response
  */
 public function update(ArticleRequest $request, Article $article)
 {
     $article->user_id = Auth::id();
     $picture = "";
     if (Input::hasFile('image')) {
         $file = Input::file('image');
         $filename = $file->getClientOriginalName();
         $extension = $file->getClientOriginalExtension();
         $picture = sha1($filename . time()) . '.' . $extension;
     }
     $article->picture = $picture;
     $article->update($request->except('image'));
     if (Input::hasFile('image')) {
         $destinationPath = base_path() . '/images/article/' . $article->id . '/';
         Input::file('image')->move($destinationPath, $picture);
     }
 }