我有两个json文件，我通过一个API检索。我想创建一个产品和类别之间的关系，以便在我的产品列表中显示类别的名称，而不是类别的id。
这里我有一个例子，我的第一个json文件，其中包含所有的产品。
listing.json

[
   {
      "id":1461267313,
      "category_id":4,
      "title":"Statue homme",
      "description":"...",
      "price":140.00,
      "images_url":{
         "small":"...",
         "thumb":"..."
      },
      "creation_date":"2019-11-05T15:56:59+0000",
      "is_urgent":false
   },
   {
      "id":1691247255,
      "category_id":8,
      "title":"Pc portable hp elitebook 820 g1 core i5 4 go ram 250 go hdd",
      "description":"...",
      "price":199.00,
      "images_url":{
         "small":"...",
         "thumb":"..."
      },
      "creation_date":"2019-10-16T17:10:20+0000",
      "is_urgent":false
   },
]

第二个json文件包含类别
categories.json

[
  {
    "id": 1,
    "name": "Véhicule"
  },

  //from 1 to 11

  {
    "id": 11,
    "name": "Enfants"
  }
]

我创建了一个产品模型和一个类别模型
product.dart

class Product {
  int? id;
  int? categoryId;
  String? title;
  String? description;
  double? price;
  ImagesUrl? imagesUrl;
  String? creationDate;
  bool? isUrgent;

  Product(
      {this.id,
      this.categoryId,
      this.title,
      this.description,
      this.price,
      this.imagesUrl,
      this.creationDate,
      this.isUrgent});
}

category.dart

class Category {
  int? id;
  String? name;

  Category({this.id, this.name});
}