php–Laravel4–尝试获取非对象的属性

我一直在使用Laravel 4.1创建一个包含用户关系的图书清单应用程序.我有用户关系工作但是当我添加分页时,我得到以下错误异常：

ErrorException
Trying to get property of non-object (View: /app/views/books/index.blade.php)
return link_to_route('user.books.show', $book->title, [$book->user->username, $book->id]);


从视图(book / index.blade.php)生成错误,但错误异常实际上来自帮助程序(参见下文).

控制器 – PARTIAL

public function show($id)
{
$book = Book::findOrFail($id);
return View::make('books.show', compact('book'));
}
}


我的路线档案

设置为强制地址为USERNAME> BOOKS> BOOK_ID：

#Books Controller
Route::resource('books', 'BooksController');
Route::get('books/{id}', 'BooksController@show')->where('id', '\d+');
//Books ID Rerouting - USERNAME -> BOOK -> Book ID
Route::get('{username}/books', 'UserBooksController@index');
Route::get('{username}/books/{id}', ['as' => 'user.books.show', 'uses' => 'UserBooksController@show']);


这是我收到错误的地方 – 它不再识别

user.books.show


books / index.blade.php文件

@foreach(array_chunk($books->getCollection()->all(), 3) as $row)


@foreach ($row as $book)

{{ link_to_book($book) }}

{{ $book->synopsis }}

Buy Now

@endforeach