如何从资源中以Laravel多对多关系显示产品的分类规格？

Question

所以有这个表：

产品

- name
- description
.etc

规范

name

product_specification 数据透视表，用于多对多关系

product_id
specification_id
value

产品型号

public function specs()
{
   return $this->belongsToMany(Specification::class)->withPivot('value');
}

规格模型

public function parent()
{
    return $this->belongsTo(Specification::class);
}

public function children()
{
    return $this->hasMany(Specification::class, 'parent_id', 'id');
}

因此，产品附带具有父母的规格，我需要与父母取得联系。 有了资源，我可以拥有这个：

{
    "data": [
        {
            "id": 1,
            "name": "Apple iPhone 11 Pro 64GB Space Gray",
            "slug": "apple-iphone-11-pro-64gb-space-gray",
            "price": "99,999",
            "description": "description",
            "specs": [
                {
                    "name": "Device type:",
                    "value": "Smartphone"
                },
                {
                    "name": "2G standarts:",
                    "value": "GSM 1800 / GSM 1900 / GSM 850 / GSM 900"
                },
             ]
          }
       ]
}

但是我希望这样：

{
    "data": [
        {
            "id": 1,
            "name": "Apple iPhone 11 Pro 64GB Space Gray",
            "slug": "apple-iphone-11-pro-64gb-space-gray",
            "price": "99,999",
            "description": "description",
          "specs": [
                {
                    "name": "Characteristics",
                    "children": [
                        {
                            "id": 2,
                            "name": "Device type:",
                            "value": "Smartphone"
                        },
                        {
                            "id": 2,
                            "name": "Device type:",
                            "value": "Smartphone"
                        },
                     ]
               },
               {
                    "name": "Processor",
                    "children": [
                        {
                            "id": 2,
                            "name": "Processor type:",
                            "value": "Apple A13 Bionic"
                        },
                        {
                            "id": 2,
                            "name": "other spec:",
                            "value": "other spec child value"
                        },
                     ]
               }
           ] 
        }
    ]
}