Problems with Alamofire response handler - json

Question

For my project I want to parse an Alamofire JSON response and save it in Realm. I already tested this by fetching the JSON from a Mock-API and it worked fine, but when I'm trying to incorporate my Code into my AM-response handling I'm getting this error:
Invalid conversion from throwing function of type '(AFDataResponse) throws -> Void' (aka '(DataResponse<Any, AFError>) throws -> ()') to non-throwing function type '(AFDataResponse) -> Void' (aka '(DataResponse<Any, AFError>) -> ()')
The Code for the response looks like this:
.responseJSON { response in //this is where I'm getting the error
print(response)
self.books = [Books]()
do {
if let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as! [String: AnyObject] {
if let booksFromJson = json["books"] as? [[String : AnyObject]]{
for bookFromJson in booksFromJson {
let book = Books()
if let title = bookFromJson["title"] as? String, let author = bookFromJson["author"] as? String, let imageLink = bookFromJson["imageLink"] as? String {
book.author = author
book.title = title
book.imageLink = imageLink
}
self.books?.append(book)
}
This is my AM-Request as a whole:
public func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
if let image:UIImage = info[UIImagePickerController.InfoKey.editedImage] as? UIImage {
self.myImage = image
AF.upload(multipartFormData: { (multipartFormData) in
multipartFormData.append(self.myImage.jpegData(compressionQuality: 0.5)!, withName: "image", fileName: "image.png", mimeType: "image/jpeg")
}, to: "https://booknerdvirtualreadinglist.herokuapp.com/getbook" , headers: nil )
.uploadProgress { progress in
print(progress)
}
.responseJSON { response in
print(response)
self.books = [Books]()
do {
if let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as! [String: AnyObject] {
if let booksFromJson = json["books"] as? [[String : AnyObject]]{
for bookFromJson in booksFromJson {
let book = Books()
if let title = bookFromJson["title"] as? String, let author = bookFromJson["author"] as? String, let imageLink = bookFromJson["imageLink"] as? String {
book.author = author
book.title = title
book.imageLink = imageLink
}
self.books?.append(book)
}
dismiss(animated: true, completion: nil)
}
Thank you in advance!

Answer 1

You are not catching the error correctly because your "try catch" only has a do block.
This is how you can properly handle an error in Swift:
do {
// some throwing code
} catch {
print("Failed with error \(error)")
}
The catch-part is missing.