I am trying to inline an array of custom types into a dir - as parameter to Alamofire. Alamofire fails with 'Invalid type in JSON write in ParameterEncoding.swift: Line142
case .JSON:
do {
let options = NSJSONWritingOptions()
let data = try NSJSONSerialization.dataWithJSONObject(parameters, options: options) // 'Invalid type in JSON write
MyClass
class MyClass{
var name: String = ""
var address: String = ""
}
This gives the error:
class MyParameters{
var MyClasses: [MyClass] = []
var dictionary: [String: AnyObject]{
get {
return [
"myclasses": self.MyClasses,
]
}
}
}
Tried this from:
class MyClass{
var name: String = ""
var address: String = ""
}
class MyParameters{
var MyClasses: [MyClass] = []
var dictionary: [String: AnyObject]{
get {
return [
"myclasses": self.MyClasses.map({$0.name}),
]
}
}
}
Related
I have the following code which has 3 objects which are then part of a 4th object. I'm getting errors trying to create the init method for the aggregate object (GTFS) because I'm passing (or trying to pass) the type of the 3 component objects (Stop, Route, Trip). I'm not sure why those have to be initialized before just their types being used.
protocol GTFSObject {
static var fileName: String { get }
init(csvRow: [String: String])
}
struct Stop: GTFSObject {
static let fileName = "stops.txt"
let stopID: String
let stopCode: String
let stopName: String
let stopDesc: String
let stopLat: Double
let stopLon: Double
let locationType: Int
let parentStation: String
init(csvRow: [String: String]) {
self.stopID = csvRow["stop_id"]!
self.stopCode = csvRow["stop_code"]!
self.stopName = csvRow["stop_name"]!
self.stopDesc = csvRow["stop_desc"]!
self.stopLat = Double(csvRow["stop_lat"]!)!
self.stopLon = Double(csvRow["stop_lon"]!)!
self.locationType = Int(csvRow["location_type"]!)!
self.parentStation = csvRow["parent_station"]!
}
}
struct Trip: GTFSObject {
static let fileName = "trips.txt"
let routeID: String
let serviceID: String
let tripID: String
init(csvRow: [String: String]) {
tripID = csvRow["trip_id"] ?? ""
routeID = csvRow["route_id"] ?? ""
serviceID = csvRow["service_id"] ?? ""
}
}
struct Route: GTFSObject {
static let fileName = "trips.txt"
let routeID: String
let agencyID: String
let routeShortName: String
let routeLongName: String
let routeDesc: String
let routeType: Int
let routeURL: String
let routeColor: String
let routeTextColor: String
init(csvRow: [String: String]) {
routeID = csvRow["route_id"] ?? ""
agencyID = csvRow["agency_id"] ?? ""
routeShortName = csvRow["route_short_name"] ?? ""
routeLongName = csvRow["route_long_name"] ?? ""
routeDesc = csvRow["route_desc"] ?? ""
routeType = Int(csvRow["route_type"] ?? "0") ?? 0
routeURL = csvRow["route_url"] ?? ""
routeColor = csvRow["route_color"] ?? ""
routeTextColor = csvRow["route_text_color"] ?? ""
}
}
class GTFS {
let routes: [Route]
let stops: [Stop]
let trips: [Trip]
init(gtfsFolderUrl: URL) {
self.stops = init_struct_from_url(gtfsFolderUrl: gtfsFolderUrl, type: Stop.self)
self.trips = init_struct_from_url(gtfsFolderUrl: gtfsFolderUrl, type: Trip.self)
self.routes = init_struct_from_url(gtfsFolderUrl: gtfsFolderUrl, type: Route.self)
}
private func init_struct_from_url<GTFSType>(gtfsFolderUrl: URL, type: GTFSType.Type) -> [GTFSType] where GTFSType : GTFSObject{
var returnList: [GTFSType] = []
let rows = try! NamedCSV(url: GTFS_FOLDER_URL.appendingPathComponent(type.fileName), delimiter: CSVDelimiter.comma, loadColumns: false).rows
for row in rows {
returnList.append(type.init(csvRow: row))
}
return returnList
}
}
The error I get is
'self' used in method call 'init_struct_from_url' before all stored properties are initialized
I don't know why I have to initialize the properties of the struct just to pass the type of the struct to this other function. What am I missing?
It's not about the three types that you are passing to init_struct_from_url. It's about the call init_struct_from_url itself.
You are actually calling:
self.init_struct_from_url(...)
^^^^^
The error is saying that that use of self is not allowed, because self is not initialised. If init_struct_from_url uses a property in self, it could see an uninitialised value.
Since init_struct_from_url doesn't actually use self at all and is just a helper function, you can make it an inner function of init:
init(gtfsFolderUrl: URL) {
func structFromUrl<GTFSType>(gtfsFolderUrl: URL, type: GTFSType.Type) -> [GTFSType] where GTFSType : GTFSObject{
var returnList: [GTFSType] = []
let rows = try! NamedCSV(url: GTFS_FOLDER_URL.appendingPathComponent(type.fileName), delimiter: CSVDelimiter.comma, loadColumns: false).rows
for row in rows {
returnList.append(type.init(csvRow: row))
}
return returnList
}
self.stops = structFromUrl(gtfsFolderUrl: gtfsFolderUrl, type: Stop.self)
self.trips = structFromUrl(gtfsFolderUrl: gtfsFolderUrl, type: Trip.self)
self.routes = structFromUrl(gtfsFolderUrl: gtfsFolderUrl, type: Route.self)
}
How to pass array parameter
Parameter
[
{
"id": 0,
"followerId": 1030,
"followingId": 1033,
"followerName": "string",
"followingName": "string",
"createdDate": "string",
"message": "string"
}
] //how to solve this array
API Function
class func postFollowers(params:[String: Any],success:#escaping([FollowingDataProvider]) -> Void, failure:#escaping (String) -> Void){
var request = RequestObject()
request = Services.servicePostForFollower(param: params)
APIManager.Singleton.sharedInstance.callWebServiceWithRequest(rqst: request, withResponse: { (response) in
if (response?.isValid)!
{
//success()
print(response?.object as! JSON)
success(self.followingJSONarser(responseObject: response?.object as! JSON));
//followingJSONarser(responseObject: response?.object as! JSON)
}
else
{
failure((response?.error?.description)!)
}
}, withError: {
(error) in
failure((error?.description)!)
})
}
Parsing
static func followingJSONarser(responseObject:JSON) -> [FollowingDataProvider]{
var dataProvider = [FollowingDataProvider]()
let jsonDataa = responseObject["data"]
print(jsonDataa)
let newJSON = jsonDataa["data"].arrayValue
print(newJSON)
for item in newJSON{
print(item)
dataProvider.append(FollowingDataProvider(id: item["userId"].intValue, followerId: item["userId"].intValue, followingId: item["followingId"].intValue, followerName: item["userName"].stringValue, followingName: item["followingName"].stringValue, createdDate: item["createdDate"].stringValue, message: item["message"].stringValue))
}
return dataProvider
}`
You can try to combine SwiftyJson with Codable
struct Root: Codable {
let id, followerID, followingID: Int
let followerName, followingName, createdDate, message: String
enum CodingKeys: String, CodingKey {
case id
case followerID = "followerId"
case followingID = "followingId"
case followerName, followingName, createdDate, message
}
}
if let con = response?.object as? JSON {
do {
let itemData = try con.rawData()
let res = try JSONDecoder().decode([Root].self, from: itemData)
print(res)
catch {
print(error)
}
}
Also avoid force-unwraps with json
response?.object as! JSON
Following your code you're trying to parse data from API, you can use SwiftyJSON with Alamofire to create an HTTP request (post,get,put,delete,etc)
You should use arrayObject instead of arrayValue
Your code missing the right definition to data parsing
static func followingJSONarser(responseObject:JSON) -> [FollowingDataProvider]{
var dataProvider = [FollowingDataProvider]()
var itemClass = [ItemClass]()
let jsonDataa = responseObject["data"] as! Dictionary
let newJSON = jsonDataa["data"].arrayObject as! Array
Now create a dataModel class to cast data to it
class ItemsClass:NSObject{
var id:Int = 0
var followerId:Int = 0
var followingId:Int = 0
var followerName:String = ""
var followingName:String = ""
var createdDate:String = ""
var message:String = ""
init(data:JSON) {
self.id = data["userId"].intValue
self.followerId = data["userId"].intValue
self.followingId = data["followingId"].intValue
self.followerName = data["userName"].stringValue
self.followingName = data["followingName"].stringValue
self.createdDate = data["createdDate"].stringValue
self.message = data["message"].stringValue
}
}
for item in newJSON{
dataProvider.append(itemClass)
}
return dataProvider
}`
I was trying convert struct to Dictionary in Swift. This was my code:
extension Encodable {
var dictionary: [String: Any]? {
if let data = try? JSONEncoder().encode(self) {
if let dict = try? JSONSerialization.jsonObject(with: data) as? [String: Any] {
return dict
}
return nil
}
return nil
}
}
This works in most situation. But when I try to convert a nested structure which contains unicode characters such as Chinese, this happened:
struct PersonModel: Codable {
var job: String?
var contacts: [ContactSimpleModel]
var manager: ManagerSimpleModel?
}
struct ContactSimpleModel: Codable {
var relation: String
var name: String
}
struct ManagerSimpleModel: Codable {
var name: String
var age: Int
}
let contact1 = ContactSimpleModel(relation: "朋友", name: "宙斯")
let contact2 = ContactSimpleModel(relation: "同学", name: "奥丁")
let manager = ManagerSimpleModel(name: "拉斐尔", age: 31)
let job = "火枪手"
let person = PersonModel(job: job, contacts: [contact1, contact2], manager: manager)
if let dict = person.dictionary {
print(dict)
}
The result of this code is this:
["contacts": <__NSArrayI 0x600002471980>(
{
name = "\U5b99\U65af";
relation = "\U670b\U53cb";
},
{
name = "\U5965\U4e01";
relation = "\U540c\U5b66";
}
)
, "manager": {
age = 31;
name = "\U62c9\U6590\U5c14";
}, "job": 火枪手]
You can see the result. The Chinese characters in those nested structures were become a utf-8 encoding string. The top-level property "job": 火枪手 is right. But the values in those nested structures were not the original string.
Is this a bug of JSONSerialization? Or how to make it right?
More information. I used the result like this:
var sortedQuery = ""
if let dict = person.dictionary {
sortedQuery = dict.sorted(by: {$0.0 < $1.0})
.map({ "\($0)\($1)" })
.joined(separator: "")
}
It was used to check whether the query was legal. The result is not the same as Java or other platform.
The result is perfectly fine. That's the internal string representation – a pre-Unicode legacy – of an array or dictionary when you print it.
Assign the values to a label or text view and you will see the expected characters.
In Vapor 1.5 I used to convert Dictionary to JSON as shown below.
How should I do it in Vapor 3.1?
In docs it says I need to create struct type and conform it to codable protocol.
Is there another method that would enable to convert the existing dictionary without creating new struct?
func makeCustomJSON(clientData: DataFromClientChargeWithCard, paymentID:String,customer: String) throws -> JSON {
var dictionaryOfStrings = [String:String]()
dictionaryOfStrings["BookingState"] = "Active"
dictionaryOfStrings["BookingStateTimeStamp"] = clientData.TimeStampBookingSavedInDB
dictionaryOfStrings["ChangesMadeBy"] = "User"
dictionaryOfStrings["PaymentID"] = paymentID
dictionaryOfStrings["DateAndTime"] = clientData.DateAndTime
dictionaryOfStrings["RatePriceClient"] = clientData.RatePriceClient
dictionaryOfStrings["Locality"] = clientData.Locality
dictionaryOfStrings["StripeCustomerID"] = customer
//some more properties below...
let response:JSON
do {
response = try JSON(node: dictionaryOfStrings)
}catch let error as NSError {
let message = "dictionaryOfStrings can't be converted in JSON"
drop.log.error(message)
logErr.prints(message: message, code: error.code)
throw NSError(domain: "errorDictionary", code: 400, userInfo: ["error" : error.localizedDescription])
}
return response
}
If you have a type like the struct that I have defined here you can simply return it, as long as it conforms to Content.
import Vapor
import FluentSQLite
struct Employee: Codable {
var id: Int?
var name: String
init(name:String) {
self.name = name
}
}
extension Employee: SQLiteModel {}
extension Employee: Migration {}
extension Employee: Parameter {}
extension Employee: Content { }
and then you can simply define a route and return it.
router.get("test") { req in
return Employee(name: "Alan")
}
if you want to use dictionary you can use the JSONSerialization and return a string.
router.get("test2") { req -> String in
let employeeDic: [String : Any] = ["name":"Alan", "age":27]
do {
let data = try JSONSerialization.data(withJSONObject: employeeDic, options: .prettyPrinted)
let jsonString = String(data: data, encoding: .utf8)
return jsonString ?? "FAILED"
}catch{
return "ERROR"
}
}
I have some model code where I have some Thoughts that i want to read and write to plists. I have the following code:
protocol Note {
var body: String { get }
var author: String { get }
var favorite: Bool { get set }
var creationDate: Date { get }
var id: UUID { get }
var plistRepresentation: [String: Any] { get }
init(plist: [String: Any])
}
struct Thought: Note {
let body: String
let author: String
var favorite: Bool
let creationDate: Date
let id: UUID
}
extension Thought {
var plistRepresentation: [String: Any] {
return [
"body": body as Any,
"author": author as Any,
"favorite": favorite as Any,
"creationDate": creationDate as Any,
"id": id.uuidString as Any
]
}
init(plist: [String: Any]) {
body = plist["body"] as! String
author = plist["author"] as! String
favorite = plist["favorite"] as! Bool
creationDate = plist["creationDate"] as! Date
id = UUID(uuidString: plist["id"] as! String)!
}
}
for my data model, then down in my data write controller I have this method:
func fetchNotes() -> [Note] {
guard let notePlists = NSArray(contentsOf: notesFileURL) as? [[String: Any]] else {
return []
}
return notePlists.map(Note.init(plist:))
}
For some reason the line return notePlists.map(Note.init(plist:)) gives the error 'map' produces '[T]', not the expected contextual result type '[Note]'
However, If I replace the line with return notePlists.map(Thought.init(plist:)) I have no issues. Clearly I can't map the initializer of a protocol? Why not and what's an alternate solution?
If you expect to have multiple types conforming to Note and would like to know which type of note it is stored in your dictionary you need to add an enumeration to your protocol with all your note types.
enum NoteType {
case thought
}
add it to your protocol.
protocol Note {
var noteType: NoteType { get }
// ...
}
and add it to your Note objects:
struct Thought: Note {
let noteType: NoteType = .thought
// ...
}
This way you can read this property from your dictionary and map it accordingly.