Laravel 5.8 ManyToMany 关系子关系使用外键不起作用

Question

当我调用我的图像资源时，它会从我的模型中返回正确的数据：

图片资源：

     return [
         'id' => $this->id,
         'name' => $this->name,
         'presentation' => $this->presentation->description,
         'slug' =>$this->filename
    ];

图像模型：

    public function presentation()
    {
        return $this->hasOne(ProductPresentation::class, 'id', 'presentation_id');
    }

返回：

{
    "data": [
        {
            "id": 1,
            "name": "White Gold",
            "presentation": "Product x",
            "slug": "products/white-gold.jpg"
        }
}

但是当我调用 manyToMany (Products -> images) 关系时，我只得到 Id 而不是外部关系

    "data": [
        {
            "id": 1,
            "name": "White Gold",
            "price": "€ 10,00",

            "images": [
                {
                    "id": 1,
                    "name": "White Gold",
                    "filename": "products/white-gold.jpg",
                    "presentation_id": 1
                }
            ]
        },

Products 资源调用图像资源，但这不会加载关系（需要“presentation”：“Product x”而不是“presentation_id”：1）

使用资源：

        return [
            'id' => $this->id,
            'name' => $this->name,
            'price' => $this->formattedPrice,
            'images' => $this->images
        ];

使用模型：

    public function images()
    {
        return $this->belongsToMany(Image::class);
    }

所以问题是我如何将关系添加到belongsToMany(Image::class)

Answer 1

尝试改变

return [
        'id' => $this->id,
        'name' => $this->name,
        'price' => $this->formattedPrice,
        'images' => $this->images
    ];

到

return [
        'id' => $this->id,
        'name' => $this->name,
        'price' => $this->formattedPrice,
        'images' => YourImageResource::collection($this->images)
    ];