Swift 4 Decodable, DecodingError : No value associated with key

Question

I'm trying to use the Swift 4 Codable feature but got stuck in this situation:

struct Message:Codable {

let message: String
let timestamp: String
let latitude: String
let longitude: String}

This is my struct.

guard let url = URL(string:"http://localhost:443/api/message") else {return}
    var request = URLRequest(url: url)
    request.httpMethod = "POST"
    request.addValue("application/json", forHTTPHeaderField: "Content-Type")
    print("POSTED")

    let newPost = Message(message: "Hi", timestamp: "1", latitude: "1.1", longitude: "2.2")

    print("NewPost:",newPost)

    do {
        let jsonBody = try JSONEncoder().encode(newPost)
        request.httpBody = jsonBody

    } catch let err  {
        print("jsonBody Error: ",err)
    }

    let session = URLSession.shared
    let task = session.dataTask(with: request){ (data,response,err) in
        guard let data = data else {return}
        do{
            let sendPost = try JSONDecoder().decode(Message.self, from: data)
            print("sendPost:\(sendPost)")
        }catch let err{
            print("Session Error: ",err)
        }
    }
    task.resume()
}

And this is the function I use for post request. In the print("NewPost:",newPost), it prints

NewPost: Message(message: "Hi", timestamp: "1", latitude: "1.1", longitude: "2.2")

which looked very identical to other examples I saw, but then there's always a Session Error by catch

Session Error:  keyNotFound(DeadDrop.Message.(CodingKeys in _5C64F74710315F52702B56CE54E28C19).message, Swift.DecodingError.Context(codingPath: [], debugDescription: "No value associated with key message (\"message\").", underlyingError: nil))

I just don't understand how this came up! I'm using the exact same struct and it says there's no key for this?! Thanks for any help!

Answer 1

SQLState: 22007 : The string representation of a datetime is not in the acceptable range or is not in the correct format.

As you told that you are getting data as below :

{"code":"ER_TRUNCATED_WRONG_VALUE","errno":1292,"sqlSta‌​te":"#22007"}

As per this link , It is expecting different datatype than you are sending.

I suspect the timestamp you are sending is 1 , and this is not a valid timestamp .

Try to send timestamp value as "1508309342"

Other than that your decoding code is fine.