Laravel：Eloquent all() 不返回对象数组
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Laravel: Eloquent all() not returning an array of objects
提问by Karl
I'm trying to build a simple forum system.
我正在尝试建立一个简单的论坛系统。
I have a model called Category.php, where I define the table and extend Eloquent.
我有一个名为 Category.php 的模型，我在其中定义了表并扩展了 Eloquent。
I have a CategoryController.php which is a resourceful controller, within the index() method, I am doing:
我有一个 CategoryController.php，它是一个资源丰富的控制器，在 index() 方法中，我正在做：
$categories = Category::all();
Which I assume should return an array of objects. This worked fine on a different project of mine.
我认为应该返回一个对象数组。这在我的另一个项目中运行良好。
However, when I try to run this through a foreach, nothing is echoed. I've tried renaming the controller and the model to ForumController and Form, respectively, and it's worked straight away.
但是，当我尝试通过 foreach 运行它时，没有任何回应。我已经尝试将控制器和模型分别重命名为 ForumController 和 Form，它立即生效。
Any ideas? Perhaps the Category name has been reserved by Laravel and is overriding my desired functionality?
有任何想法吗？也许类别名称已被 Laravel 保留并且覆盖了我想要的功能？
CategoryController.php:
类别控制器.php：
<?php
class CategoryController extends \BaseController {
protected $layout = 'master';
/**
* Display a listing of the resource.
*
* @return Response
*/
public function index()
{
//
$categories = Category::all();
$this->layout->content = View::make('category.index', array('categories' => $categories));
}
Category.php (model):
Category.php（模型）：
<?php
class Category extends Eloquent {
/**
* The database table used by the model.
*
* @var string
*/
protected $table = 'categories';
}
Category/index.blade.php (view):
类别/index.blade.php（查看）：
@section('content')
<ul>
@foreach ($categories as $category)
<li><a href="/category/{{ $category->slug }}">{{ $category->name }}</a></li>
@endforeach
</ul>
@stop
My database is set up correctly. When I run $category = Category::find(1); it correctly returns the category with an id of 1, which I can use as an object.
我的数据库设置正确。当我运行 $category = Category::find(1); 它正确返回 id 为 1 的类别，我可以将其用作对象。
回答by SamV
You can iterate over Category::all();. Laravels Collectionclass implements the following interfaces:
您可以迭代Category::all();. LaravelsCollection类实现了以下接口：
ArrayAccess, ArrayableInterface, Countable, IteratorAggregate, JsonableInterface
Which means:
意思是：
foreach(Category::all() as $category) {
var_dump($category);
}
Will work, the Eloquent\Collectionthat is returned extends the Support\Collectionclass, which implements the above interfaces.
将工作，Eloquent\Collection返回的扩展了Support\Collection实现上述接口的类。
Take a look at the Support\Collectionclass in Illuminate.
看一看中的Support\Collection类Illuminate。
回答by Mark Baker
You're right, when returning multiple results, Eloquent returns a Collection(which is quite common practise among frameworks).
你是对的，当返回多个结果时，Eloquent 返回一个Collection（这在框架中是很常见的做法）。
You can convert a Collectionto other formats using methods like toArray()or toJson(); but you can also iterate through the count()of results using methods like fetch(), or fetch specific entries using get()
您可以Collection使用toArray()或等方法将 a 转换为其他格式toJson()；但您也可以count()使用诸如 之类的方法遍历结果fetch()，或使用get()
EDIT
编辑
While you can't iterate directly over the Collection, you can convert it to an iterable structure using the getIterator()method, which returns an SPL ArrayIteratorobject
虽然您不能直接迭代Collection，但您可以使用getIterator()方法将其转换为可迭代结构，该方法返回一个 SPL ArrayIterator对象
