Question

我正在尝试使用Laravel的资源集合转换所有产品的json数据。但这会引发错误：“此集合实例上不存在属性[名称]”。

我检查了官方文档，他们以类似的方式实施了该文档。

ProductController.php

public function index()
    {
        return new ProductCollection(Product::all());
    }

ProductCollection.php

namespace App\Http\Resources\Product;

use Illuminate\Http\Resources\Json\ResourceCollection;

class ProductCollection extends ResourceCollection
{
    /**
     * Transform the resource collection into an array.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return array
     */
    public function toArray($request)
    {
        return [
            'name' => $this->name,
            'price' => $this->price
        ];
    }
}

ProductResource.php

namespace App\Http\Resources\Product;

use Illuminate\Http\Resources\Json\JsonResource;

class ProductResource extends JsonResource
{
    /**
     * Transform the resource into an array.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return array
     */
    public function toArray($request)
    {
        return [
            'name' => $this->name,
            'description' => $this->detail,
            'price' => $this->price,
            'stock' => $this->stock,
            'discount' => $this->discount,
            'effectivePrice' => round($this->price * (1 - ($this->discount/100)), 2),
            'rating' => $this->reviews->count() > 0 ? round($this->reviews->sum('star') / $this->reviews->count(), 2) : 'No Ratigs Yet',
            'href' => [
                'reviews' => route('reviews.index', $this->id)
            ]
        ];
    }
}

注意：：在不转换ProductCollection时，即当ProductCollection的 toArray（）函数如下所示时，工作正常：

public function toArray($request)
    {
        return parent::toArray($request);
    }

Answer 1

ProductCollection用于Products的集合。
因此，您需要使用foreach。

class ProductCollection extends ResourceCollection
{
    /**
     * Transform the resource collection into an array.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return array
     */
    public function toArray($request)
    {

        // final array to be return.
        $products = [];

        foreach($this->collection as $product) {

             array_push($products, [
                 'name' => $product->name,
                 'price' => $product->price
             ]);

        }

        return $products;
    }
}

Answer 2

您可以使用资源返回集合，而无需使用“ collection”静态方法进行循环：

public function index()
    {
        return ProductCollection::collection(Product::all());
    }

Answer 3

我发现您不需要的话就不必循环收集。

就我而言，我有一个事件集合。我所做的就是这个。

php artisan make:resource Event

php artisan make:resource EventCollection

事件

return [
  "id"        => $this->id,
  "title"     => $this->title,
  "parent_id" => $this->parent_id,
  "color"     => $this->color,
  "start"     => $this->start_date,
  "end"       => $this->end_date
];

，并在EventCollection中将其保持不变：

return parent::toArray($request);

Laravel：此集合实例上不存在属性[名称]

3 个答案: