swift:apiのレスポンスJSONをCodableで読み取りたい

Question

前提・実現したいこと

SwifのCodableを使ってFlickrAPIのレスポンス(JSON)を読み込みたい

発生している問題・エラーメッセージ

typeMismatch(Swift.Array<Any>, Swift.DecodingError.Context(codingPath: [CodingKeys(stringValue: "photos", intValue: nil)], debugDescription: "Expected to decode Array<Any> but found a dictionary instead.", underlyingError: nil))

該当のソースコード

//: Playground - noun: a place where people can play

import UIKit
import Foundation

struct Photo: Codable {
    let id: String
    let owner: String
    let secret: String
    let server: String
    let farm: Int
    let title: String
    let ispublic: Int
    let isfriend: Int
    let isfamily: Int
    let url_z: String
    let height_z: String
    let width_z: String
}

struct Photos: Codable {
    let page: Int
    let pages: Int
    let perpage: Int
    let total: String
    let photo: [Photo]
}

struct FlickrJson: Codable {
    let photos: [Photos]
    let stat: String
}

let url: URL = URL(string: "https://api.flickr.com/services/rest/?method=flickr.photos.search&api_key=b92e39e1e3032c52368b9dde00a366b6&text=apple&sort=interestingness-desc&extras=url_z&per_page=5&format=json&nojsoncallback=1&api_sig=c1373de25250f8592ce893d622ef99e8")!
let task: URLSessionTask  = URLSession.shared.dataTask(with: url, completionHandler: {data, response, error in
    do {
        let jsonData = try JSONDecoder().decode(FlickrJson.self, from: data!)        
    }
    catch {
        print(error)
    }
})
task.resume()

{"photos":{"page":1,"pages":454311,"perpage":5,"total":"2271555","photo":[{"id":"13823027375","owner":"27263572@N05","secret":"2faf0ff3e1","server":"2932","farm":3,"title":"apple trees","ispublic":1,"isfriend":0,"isfamily":0,"url_z":"https://farm3.staticflickr.com/2932/13823027375_2faf0ff3e1_z.jpg","height_z":"427","width_z":"640"},{"id":"14923643380","owner":"56393389@N05","secret":"16107e4234","server":"3862","farm":4,"title":"Apple time","ispublic":1,"isfriend":0,"isfamily":0,"url_z":"https://farm4.staticflickr.com/3862/14923643380_16107e4234_z.jpg","height_z":"499","width_z":"632"},{"id":"3005896202","owner":"11142308@N07","secret":"95e2e72bd2","server":"3152","farm":4,"title":"Apple... Greek Moonshine","ispublic":1,"isfriend":0,"isfamily":0,"url_z":"https://farm4.staticflickr.com/3152/3005896202_95e2e72bd2_z.jpg","height_z":398,"width_z":"640"},{"id":"15210936448","owner":"65068817@N05","secret":"b26fb882b1","server":"3907","farm":4,"title":"Apples...","ispublic":1,"isfriend":0,"isfamily":0,"url_z":"https://farm4.staticflickr.com/3907/15210936448_b26fb882b1_z.jpg","height_z":"425","width_z":"640"},{"id":"43537647531","owner":"128091419@N08","secret":"b43be4df8d","server":"849","farm":1,"title":"Apple rain","ispublic":1,"isfriend":0,"isfamily":0,"url_z":"https://farm1.staticflickr.com/849/43537647531_b43be4df8d_z.jpg","height_z":"640","width_z":"480"}]},"stat":"ok"}

試したこと

エラーメッセージに"Expected to decode Array<Any> but found a dictionary instead."とあるのでCodableの書き方が違うのかと思って見直したのですが解決できませんでした。

補足情報（FW/ツールのバージョンなど）

Xcode10.0, Swift4, Codable, playground

Answer 1

Expected to decode Array<Any> but found a dictionary instead.

Google翻訳より

配列<Any>のデコードが予想されますが、代わりに辞書が見つかりました。

辞書なのに配列を指定しているということです。
ということで、

let photos: [Photos] → let photos: Photos

---

あと、質問内のJSONは一箇所だけheight_zがIntになっているので、今のままだと別のエラーが出ます。

"height_z": 398