Getting keyNotFound error

iOS Programming (7th Edition) 20. Web Services
1

Hi, I’m trying to run the build on page 409 and keep getting the following error:

Error fetching interesting photos: keyNotFound(CodingKeys(stringValue: “photo”, intValue: nil), Swift.DecodingError.Context(codingPath: [], debugDescription: “No value associated with key CodingKeys(stringValue: “photo”, intValue: nil) (“photo”).”, underlyingError: nil))

Does anyone have any ideas?

    import Foundation

class Photo: Codable {
    let title: String
    let remoteURL: URL
    let photoID: String
    let dateTaken: Date
    
    enum CodingKeys: String, CodingKey {
        case title
        case remoteURL = "url_z"
        case photoID = "id"
        case dateTaken = "datetaken"
    }
}


    enum EndPoint: String {
        case interestingPhotos = "flickr.interestingness.getList"
    }

    struct FlickrAPI {
    
    private static let baseURLString = "https://api.flickr.com/services/rest"
    private static let apiKey = "a6d819499131071f158fd740860a5a88"
    
    private static func flickrURL(endPoint: EndPoint,
                                  parameters: [String:String]?) -> URL {
        
        var components = URLComponents(string: baseURLString)!
        var queryItems = [URLQueryItem]()
        
        let baseParams = [
            "method": endPoint.rawValue,
            "format": "json",
            "nojsoncallback": "1",
            "api_key": apiKey
        ]
        
        for (key, value) in baseParams {
            let item = URLQueryItem(name: key, value: value)
            queryItems.append(item)
        }
        if let additionalParams = parameters {
            for (key, value) in additionalParams {
                let item = URLQueryItem(name: key, value: value)
                queryItems.append(item)
            }
        }
        components.queryItems = queryItems
        
        return components.url!
    }
    
    static var interestingPhotosURL: URL {
        return flickrURL(endPoint: .interestingPhotos,
                         parameters: ["extras": "url_z,date_taken"])
        
    }
    import Foundation

enum EndPoint: String {
    case interestingPhotos = "flickr.interestingness.getList"
}

struct FlickrAPI {
    
    private static let baseURLString = "https://api.flickr.com/services/rest"
    private static let apiKey = "a6d819499131071f158fd740860a5a88"
    
    private static func flickrURL(endPoint: EndPoint,
                                  parameters: [String:String]?) -> URL {
        
        var components = URLComponents(string: baseURLString)!
        var queryItems = [URLQueryItem]()
        
        let baseParams = [
            "method": endPoint.rawValue,
            "format": "json",
            "nojsoncallback": "1",
            "api_key": apiKey
        ]
        
        for (key, value) in baseParams {
            let item = URLQueryItem(name: key, value: value)
            queryItems.append(item)
        }
        if let additionalParams = parameters {
            for (key, value) in additionalParams {
                let item = URLQueryItem(name: key, value: value)
                queryItems.append(item)
            }
        }
        components.queryItems = queryItems
        
        return components.url!
    }
    
    static var interestingPhotosURL: URL {
        return flickrURL(endPoint: .interestingPhotos,
                         parameters: ["extras": "url_z,date_taken"])
        
    }
    
    struct FlickrResponse: Codable {
        let photosInfo: FlickrPhotosResponse
        
        enum CodingKeys: String, CodingKey {
            case photosInfo = "photo"
        }
    }
    struct FlickrPhotosResponse: Codable {
        let photos: [Photo]
        
        enum CodingKeys: String, CodingKey {
            case photos = "photo"
        }
    }
    
    static func photos(fromJSON data: Data) -> Result<[Photo], Error> {
        do {
            let decoder = JSONDecoder()
            
            let dateFormatter = DateFormatter()
            dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
            dateFormatter.locale = Locale(identifier: "en_US_POSIX")
            dateFormatter.timeZone = TimeZone(secondsFromGMT: 0)
            decoder.dateDecodingStrategy = .formatted(dateFormatter)
            
            let flickrResponse = try decoder.decode(FlickrResponse.self, from: data)
            return .success(flickrResponse.photosInfo.photos)
        } catch {
            return .failure(error)
        }
    }

}
2

After adding the dateFormatter to static func photos you’re going to get that error. Look at the last few paragraphs on page 410 & they’ll explain the error. Listing 20.27 on page 411 has the fix for the error.

3

I should have included this earlier but the error that I have is a different error than what it shows in the book.

4

It may not be word-for-word identical, but it’s pretty similar. So if you haven’t yet incorporated the fix on page 411 (the code you posted doesn’t have it), I suggest you try that first.

5

Hang on, there’s a problem in the code above. It should read

            case photosInfo = "photos"
6

That did it! Thanks so much! I was really stuck on this!

Edit: Btw, how do I mark this as solved?