Laravel 5 - 从Object中提取ID

Question

我在laravel 5.5 $ categories 中有一个对象，看起来像这样......

Illuminate\Database\Eloquent\Collection Object
(
    [items:protected] => Array
        (
            [0] => App\Category Object
                (
                    [table:protected] => categories
                    [primaryKey] => id
                    [attributes:protected] => Array
                        (
                            [id] => 22
                            [title] => Fruit
                            [slug] => fruit
                        )

                    [original:protected] => Array
                        (
                            [id] => 22
                            [title] => Fruit
                            [slug] => fruit
                        )
                )
         )

）

如何从此对象获取id？我试过了这两个......

{{$categories->id}}
{{$categories->category->id}}

但它们不起作用，我应该如何提取这个值呢？

Answer 1

由于it's a collection and one model，您应该使用pluck()来获取所有ID：

$ids = $categories->pluck('id');

@foreach ($ids as $id)
    {{ $id }}
@endforeach

或者你可以逐个获得它们：

@foreach ($categories as $category)
    {{ $category->id }}
@endforeach