尝试获得非对象属性

I have been working with Laravel 4.1 to create a book list app with user relationships. I have the user relationships working however when I added the pagination I get the following Error Exception:

我一直在与Laravel 4.1合作，创建一个有用户关系的图书列表应用程序。我有用户关系工作，但当我添加分页时，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]);

The error generates from the view (book/index.blade.php) but the error exception actually comes from the helper (see below).

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

Controller - PARTIAL

控制器——部分

public function show($id)
{
    $book = Book::findOrFail($id);

    return View::make('books.show', compact('book'));
}
}

My Route File

我的路由文件

is set up to force the address to be the USERNAME>BOOKS>BOOK_ID:

设置为强制将地址设置为用户名>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']);

Which is where I am getting the error - it no longer recognizes

哪里是我得到错误的地方——它不再识别

user.books.show

books/index.blade.php file

书/ index.blade。php文件

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

    <div class="row">

    @foreach ($row as $book)

      <div class="col-md-4">
        <div class="thumbnail">
         <img data-src="{{ $book->image }}" alt="">
          <div class="caption">
            <h3>{{ link_to_book($book) }}</h3>
            <p>{{ $book->synopsis }} </p>
            <p><a href="{{ link_to_book($book) }}" class="btn btn-primary" role="button">Buy Now</a></p>
          </div>
        </div>
      </div>

    @endforeach
      </div>
    </div>
@endforeach     

{{ dd(Request::only('1')) }}    

{{ $books->appends(Request::only('1'))->links() }}  

HELPER FILE

辅助文件

<?php


function link_to_book(Book $book)

{
    return link_to_route('user.books.show', $book->title, [$book->user->username, $book->id]);
}

2 个解决方案

#1

I had the same issue and that's how I resolved it. To access the elements in the array, use array notation: $book['image']

我也有同样的问题，我就是这样解决的。要访问数组中的元素，请使用数组符号:$book['image']

$book->image is object notation, which can only be used to access object attributes and methods. try this:

$book->图像是对象表示法，只能用于访问对象属性和方法。试试这个:

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

    <div class="row">

    @foreach ($row as $book)

      <div class="col-md-4">
        <div class="thumbnail">
         <img data-src="{{ $book['image'] }}" alt="">
          <div class="caption">
            <h3>{{ link_to_book($book) }}</h3>
            <p>{{ $book['synopsis'] }} </p>
            <p><a href="{{ link_to_book($book) }}" class="btn btn-primary" role="button">Buy Now</a></p>
          </div>
        </div>
      </div>

    @endforeach
      </div>
    </div>
@endforeach     

{{ dd(Request::only('1')) }}    

{{ $books->appends(Request::only('1'))->links() }}  

That should resolve it. What its saying is that you are calling a non object in a way that should only be used for objects. Let me know if it works.

这应该解决它。它的意思是，你以一种只能用于对象的方式调用一个非对象。如果有用，请告诉我。

#2

Try output gettype($book), if you get null in any point

如果您在任何点上都得到null，请尝试输出gettype($book)

{{$book['image']}} //will not complain about it but gives output ""
{{$book->image}} //will complain about it and throws an exception

I think that's the reason

我想这就是原因

I'm using laravel5 but I think it is the same with laravel4

我使用的是laravel5，但我认为它和laravel4是一样的。