php Laravel 4 - 试图获取非对象的属性
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Laravel 4 - Trying to get property of non-object
提问by Andrew
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:
我一直在使用 Laravel 4.1 创建一个具有用户关系的图书列表应用程序。我有用户关系，但是当我添加分页时，我收到以下错误异常：
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, $book->id]);
The error generates from the view (book/index.blade.php) but the error exception actually comes from the helper (see below).
错误从视图 (book/index.blade.php) 生成，但错误异常实际上来自帮助程序（见下文）。
Controller - PARTIAL
控制器 - 部分
public function show($id)
{
$book = Book::findOrFail($id);
return View::make('books.show', compact('book'));
}
}
My Route File
我的路线文件
is set up to force the address to be the USERNAME>BOOKS>BOOK_ID:
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']);
Which is where I am getting the error - it no longer recognizes
这是我收到错误的地方 - 它不再识别
user.books.show
books/index.blade.php file
书籍/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
帮助文件
<?php
function link_to_book(Book $book)
{
return link_to_route('user.books.show', $book->title, [$book->user->username, $book->id]);
}
回答by cppit
I had the same issue and that's how I resolved it. To access the elements in the array, use array notation: $book['image']
我有同样的问题，这就是我解决它的方式。要访问数组中的元素，请使用数组表示法：$book['image']
$book->imageis object notation, which can only be used to access object attributes and methods.
try this:
$book->image是对象表示法，只能用于访问对象的属性和方法。尝试这个：
@foreach(array_chunk($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')) }}
{{ $books->appends(Request::only('1'))->links() }}
That should resolve it. What its saying is that you are calling a non object in a way that should only be used for objects. Let me know if it works.
那应该可以解决它。它的意思是你正在以一种只能用于对象的方式调用非对象。让我知道它是否有效。
回答by PJ3
Try output gettype($book), if you get null in any point
尝试输出 gettype($book)，如果你在任何时候得到 null
{{$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
我认为这就是原因
I'm using laravel5 but I think it is the same with laravel4
我正在使用 laravel5 但我认为它与 laravel4 相同
