为什么在使用Alamofire时没有找到任何价值？

Question

我正在使用Alamofire在Yummly.com上拨打电话，该电话应该向我发送一个包含多个食谱的数组。在进行API调用时，一切正常。但是当我尝试将这些多个响应添加到一个值中时，这个消息会出现问题：

valueNotFound（Swift.Int，Swift.DecodingError.Context（codingPath：[CodingKeys（stringValue：“matches”，intValue：nil），_ JSONKey（stringValue：“Index 5”，intValue：5），CodingKeys（stringValue：“totalTimeInSeconds”， intValue：nil）]，debugDescription：“预期的Int值但是找到了null。”，underlyingError：nil））

struct RecipeSearchResult: Decodable {
  let name: String?
  let ingredients: String?
  let image: URL?
  let rating: Int?
  let timer: Int?
}

struct SearchRecipesRoot: Decodable {
  let matches: [Matches]
}

struct Matches: Decodable {
  let recipeName: String
  let smallImageUrls: [URL]
  let ingredients: [String]
  let id: String
  let totalTimeInSeconds: Int
  let rating: Int
}

func searchRecipes(from userIngredients: String) {
    let urlSearchParameter = "&q=\(userIngredients)&requirePictures=true"
    let searchURL = URL(
      string: "https://api.yummly.com/v1/api/recipes?" + urlAPIParameter + urlSearchParameter)!

    Alamofire.request(searchURL, method: .get).responseJSON {
      (response) in
      guard response.result.isSuccess else {
        print("☠️ \(String(describing: response.result.error)) ☠️")
        return
      }
      do {
        let responseJSON = try JSONDecoder().decode(SearchRecipesRoot.self, from: response.data!)
        for result in responseJSON.matches {
          let recipiesSearchResult = RecipeSearchResult(
            name: result.recipeName,
            ingredients: result.ingredients.joined(separator: "\n"),
            image: result.smallImageUrls[0],
            rating: result.rating,
            timer: result.totalTimeInSeconds
          )
          print(recipiesSearchResult)
        }
      }
      catch {
        print(error)
      }
    }
  }

这是JSON响应，它与发现的食谱一样重复：

{
    "criteria": {
        "q": "pasta tomatoes cheese salmon",
        "requirePictures": true,
        "allowedIngredient": null,
        "excludedIngredient": null
    },
    "matches": [
        {
            "imageUrlsBySize": {
                "90": "https://lh3.googleusercontent.com/7lLNUgFrzS0rHdWGYKhv4qnVg2mPkafkZzSqUWYrFCOJpV4xq_KwU5HuB8KGHdn40G-s-RQQISyaCyPdJWCxpA=s90-c"
            },
            "sourceDisplayName": "The Washington Post",
            "ingredients": [
                "dried pasta",
                "olive oil",
                "vidalia onion",
                "garlic",
                "tomatoes",
                "cream cheese",
                "smoked salmon",
                "freshly ground black pepper",
                "basil leaves",
                "parmesan cheese"
            ],
            "id": "Tomato-and-Smoked-Salmon-Pasta-2161877",
            "smallImageUrls": [
                "https://lh3.googleusercontent.com/R1P8lKMQZz__M77Pav5ptnX2gdzxqY1wj6xzIaxHNuFFT6xe3QQ5E-nxgEROOJ2S0GUjpNruHrsNk-c0G9fO=s90"
            ],
            "recipeName": "Tomato and Smoked Salmon Pasta",
            "totalTimeInSeconds": 2100,
            "attributes": {
                "course": [
                    "Main Dishes"
                ]
            },
            "flavors": {
                "piquant": 0,
                "meaty": 0.16666666666666666,
                "bitter": 0.3333333333333333,
                "sweet": 0.16666666666666666,
                "sour": 0.3333333333333333,
                "salty": 0.8333333333333334
            },
            "rating": 3
        },

Answer 1

问题来自“timer：result.totalTimeInSeconds”，它返回零点，这使得API调用返回“ValueNotFound”结果。

timer: result.totalTimeInSeconds ?? 0