json - 解码JSON数据时Type不符合Identifiable

Question

我正在尝试为我的应用程序使用不同的 json 文件。原始 json 文件中有 "id"，但新的 json 文件中有 "nr"。所以我将代码更改为:

import Foundation

struct Pokemon: Decodable, Identifiable {
    let nr: Int
    let name: String
    let imageUrl: String
    let type: String
} 

早期的代码使用 let id: Int 而不是 let nr: Int。更改此代码后，出现错误:

Type pokemon does not conform to protocol identifiable

这是旧的 json 文件:

{
    "attack": 49,
    "defense": 49,
    "description": "Bulbasaur can be seen napping in bright sunlight.\nThere is a seed on its back. By soaking up the sun’s rays,\nthe seed grows progressively larger.",
    "evolutionChain": [
      {
        "id": "2",
        "name": "ivysaur"
      },
      {
        "id": "3",
        "name": "venusaur"
      }
    ],
    "height": 7,
    "id": 1,
    "imageUrl": "https://firebasestorage.googleapis.com/v0/b/pokedex-bb36f.appspot.com/o/pokemon_images%2F2CF15848-AAF9-49C0-90E4-28DC78F60A78?alt=media&token=15ecd49b-89ff-46d6-be0f-1812c948e334",
    "name": "bulbasaur",
    "type": "poison",
    "weight": 69
  },

鉴于新文件有 "nr" 而不是 "id":

{
    "nr": 1,
    "nrp": "001",
    "name": "Bulbasaur",
    "class": "Seed Pok\u00e9mon",
    "icon": "https:\/\/s6.postimg.org\/z17mvgtgx\/001.png",
    "art": "https:\/\/s6.postimg.org\/bu799hi5t\/001.png",
    "types": [
      "Grass",
      "Poison"
    ],

我搜索后发现我需要使用 id 因为它用作标识符。如何使用那个“nr”而不是 id？或任何其他方式在新的 json 文件中使用 id？

Answer 1

你可以使用可计算的属性，比如

struct Pokemon: Decodable, Identifiable {
    var id: Int { nr }                       // << here !!
    let nr: Int
    let name: String
    let imageUrl: String
    let type: String
}