/**
  * Display the specified resource.
  *
  * @param  int  $id
  * @return Response
  */
 public function show($id)
 {
     $book = Book::findorFail($id);
     $message = Message::where('book_id', '=', $id)->take(10)->get();
     if (!Auth::check()) {
         $user_id = 1;
     } else {
         $user_id = Auth::user()->id;
     }
     if (is_null($book)) {
         abort(404);
     }
     return view('books.show', compact('book', 'user_id', 'message'));
 }