How to convert Dictionary to JSON in Vapor 3? - swift

Question

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
}

Answer 1

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"
}
}