I have the following dummy JSON data for a bus to school.
{
"toSchool": {
"weekday": [{
"hour": 7,
"min": 10,
"type": null,
"rotary": false
}],
"sat": [{
"hour": 8,
"min": 15,
"type": null,
"rotary": true
}]
}
}
I would like to access "weekday" and "sat" key with a variable based on user input. How can I achieve this natively?
Using SwiftyJSON, it is fairly simple like below
let json = try JSON(data: data)
let userDirection = "shosfc"
let userWeek = "weekday"
let busList = json[userDirection][0][userWeek]
However, I was wondering how this would be done natively to remove dependencies.
It seems that CodingKey and enum might be the way to handle this. When the example is as simple as this, I can understand. However, I just cannot get my head around it for my particular usage where it involves custom objects not just String.
How can I do this? Please help.
This is based on your earlier question
func bus(isWeekday: Bool = true) -> [Bus] {
return isWeekday ? shosfc.weekDay : shosfc.sat
}
I think code that below will work:
struct SampleResponse: Codable {
let toSchool: ToSchool
}
struct ToSchool: Codable {
let weekday, sat: [Sat]
}
struct Sat: Codable {
let hour, min: Int
let type: String?
let rotary: Bool
}
To decode this type of response, you must decode this JSON with SampleResponse type.
let sampleResponse = try? newJSONDecoder().decode(SampleResponse.self, from: jsonData)
After that, you can reach variables like you asked.
You can convert JSON string to Dictionary in swift and access it the same way you just did:
func parseToDictionary(_ jsonStr: String) -> [String: Any]? {
if let data = jsonStr.data(using: .utf8) {
do {
return try JSONSerialization.jsonObject(with: data, options: []) as? [String: Any]
} catch {
print(error.localizedDescription)
}
}
return nil
}
let jsonStr = "{Your JSON String}"
let json = parseToDictionary(jsonStr)
let userDirection = "shosfc"
let userWeek = "weekday"
let busList = json[userDirection][0][userWeek]
Related
I am running into an issue building the correct data model for the following JSON response.
{
"resources": [
{
"courseid": 4803,
"color": "Blue",
"teeboxtype": "Championship",
"slope": 121,
"rating": 71.4
},
{
"courseid": 4803,
"color": "White",
"teeboxtype": "Men's",
"slope": 120,
"rating": 69.6
},
{
"courseid": 4803,
"color": "Red",
"teeboxtype": "Women's",
"slope": 118,
"rating": 71.2
}
]
}
Here is the current model. No matter what I do I can't seem to get the model populated. Here is also my URL session retrieving the data. I am new to Swift and SwiftUI so please be gentle. I am getting data back however I am missing something.
import Foundation
struct RatingsResources: Codable {
let golfcourserating : [GolfCourseRating]?
}
struct GolfCourseRating: Codable {
let id: UUID = UUID()
let courseID: Int?
let teeColor: String?
let teeboxtype: String?
let teeslope: Double?
let teerating: Double?
enum CodingKeysRatings: String, CodingKey {
case courseID = "courseid"
case teeColor = "color"
case teeboxtype
case teeslope = "slope"
case teerating = "rating"
}
}
func getCoureRating(courseID: String?) {
let semaphore = DispatchSemaphore (value: 0)
print("GETTING COURSE TEE RATINGS..........")
let urlString: String = "https://api.golfbert.com/v1/courses/\(courseID ?? "4800")/teeboxes"
print ("API STRING: \(urlString) ")
let url = URLComponents(string: urlString)!
let request = URLRequest(url: url.url!).signed
let task = URLSession.shared.dataTask(with: request) { data, response, error in
let decoder = JSONDecoder()
guard let data = data else {
print(String(describing: error))
semaphore.signal()
return
}
if let response = try? JSONDecoder().decode([RatingsResources].self, from: data) {
DispatchQueue.main.async {
self.ratingresources = response
}
return
}
print("*******Data String***********")
print(String(data: data, encoding: .utf8)!)
print("***************************")
let ratingsData: RatingsResources = try! decoder.decode(RatingsResources.self, from: data)
print("Resources count \(ratingsData.golfcourserating?.count)")
semaphore.signal()
}
task.resume()
semaphore.wait()
} //: END OF GET COURSE SCORECARD
First of all, never use try? while decoding your JSON. This will hide all errors from you. Use try and an appropriate do/catch block. In the catch block at least print the error.
Looking at your model there seem to be three issues here.
You don´t have an array of RatingsResources in your array. It is just a single instance.
let response = try JSONDecoder().decode(RatingsResources.self, from: data)
RatingsResources is not implemented correct.
let golfcourserating : [GolfCourseRating]?
should be:
let resources: [GolfCourseRating]?
Your coding keys are implemented wrong instead of:
enum CodingKeysRatings: String, CodingKey {
it should read:
enum CodingKeys: String, CodingKey {
You should add enum CodingKey with resources at struct RatingsResources
And decode:
if let response = try? JSONDecoder().decode(RatingsResources.self, from: data) {
// Your response handler
}
I have an API which returns a payload like this (just one item is included in the example).
{
"length": 1,
"maxPageLimit": 2500,
"totalRecords": 1,
"data": [
{
"date": "2021-05-28",
"peopleCount": 412
}
]
}
I know I can actually create a struct like
struct Root: Decodable {
let data: [DailyCount]
}
struct DailyCount: Decodable {
let date: String
let peopleCount: Int
}
For different calls, the same API returns the same format for the root, but the data is then different. Moreover, I do not need the root info (length, totalRecords, maxPageLimit).
So, I am considering to create a custom init in struct DailyCount so that I can use it in my URL session
let reports = try! JSONDecoder().decode([DailyCount].self, from: data!)
Using Swift 5 I tried this:
struct DailyCount: Decodable {
let date: String
let peopleCount: Int
}
extension DailyCount {
enum CodingKeys: String, CodingKey {
case data
enum DailyCountCodingKeys: String, CodingKey {
case date
case peopleCount
}
}
init(from decoder: Decoder) throws {
// This should let me access the `data` container
let container = try decoder.container(keyedBy: CodingKeys.self
peopleCount = try container.decode(Int.self, forKey: . peopleCount)
date = try container.decode(String.self, forKey: .date)
}
}
Unfortunately, it does not work. I get two problems:
The struct seems not to conform anymore to the Decodable protocol
The CodingKeys does not contain the peopleCount (therefore returns an error)
This can’t work for multiple reasons. You are trying to decode an array, so your custom decoding implementation from DailyCount won’t be called at all (if it were to compile) since at the top level your JSON contains an object, not an array.
But there is a much simpler solution which doesn’t even require implementing Decodable yourself.
You can create a generic wrapper struct for your outer object and use that with whatever payload type you need:
struct Wrapper<Payload: Decodable>: Decodable {
var data: Payload
}
You then can use this to decode your array of DailyCount structs:
let reports = try JSONDecoder().decode(Wrapper<[DailyCount]>.self, from: data).data
This can be made even more transparent by creating an extension on JSONDecoder:
extension JSONDecoder {
func decode<T: Decodable>(payload: T.Type, from data: Data) throws -> T {
try decode(Wrapper<T>.self, from: data).data
}
}
Sven's answer is pure and elegant, but I would be remiss if I didn't point out that there is also a stupid but easy way: dumpster-dive into the "data" without using Codable at all. Example:
// preconditions
let json = """
{
"length": 1,
"maxPageLimit": 2500,
"totalRecords": 1,
"data": [
{
"date": "2021-05-28",
"peopleCount": 412
}
]
}
"""
let jsonData = json.data(using: .utf8)!
struct DailyCount: Decodable {
let date: String
let peopleCount: Int
}
// okay, here we go
do {
let dict = try JSONSerialization.jsonObject(with: jsonData, options: []) as? [AnyHashable:Any]
let arr = dict?["data"] as? Array<Any>
let json2 = try JSONSerialization.data(withJSONObject: arr as Any, options: [])
let output = try JSONDecoder().decode([DailyCount].self, from: json2)
print(output) // yep, it's an Array of DailyCount
} catch {
print(error)
}
I am trying to decode data from a Firebase DataSnapshot so that it can be decoded using JSONDecoder.
I can decode this data fine when I use a URL to access it with a network request (obtaining a Data object).
However, I want to use the Firebase API to directly obtain the data, using observeSingleEvent as described on this page.
But, when I do this, I cannot seem to convert the result into a Data object, which I need to use JSONDecoder.
Is it possible to do the new style of JSON decoding with a DataSnapshot? How is it possible? I can't seem to figure it out.
I have created a library called CodableFirebase that provides Encoders and Decoders that are designed specifically for Firebase.
So for the example above:
import Firebase
import CodableFirebase
let item: GroceryItem = // here you will create an instance of GroceryItem
let data = try! FirebaseEncoder().encode(item)
Database.database().reference().child("pathToGraceryItem").setValue(data)
And here's how you will read the same data:
Database.database().reference().child("pathToGraceryItem").observeSingleEvent(of: .value, with: { (snapshot) in
guard let value = snapshot.value else { return }
do {
let item = try FirebaseDecoder().decode(GroceryItem.self, from: value)
print(item)
} catch let error {
print(error)
}
})
I've converted Firebase Snapshots using JSONDecoder by converting snapshots back to JSON in Data format. Your struct needs to conform to Decodable or Codable. I've done this with SwiftyJSON but this example is using JSONSerialization and it still works.
JSONSnapshotPotatoes {
"name": "Potatoes",
"price": 5,
}
JSONSnapshotChicken {
"name": "Chicken",
"price": 10,
"onSale": true
}
struct GroceryItem: Decodable {
var name: String
var price: Double
var onSale: Bool? //Use optionals for keys that may or may not exist
}
Database.database().reference().child("grocery_item").observeSingleEvent(of: .value, with: { (snapshot) in
guard let value = snapshot.value as? [String: Any] else { return }
do {
let jsonData = try JSONSerialization.data(withJSONObject: value, options: [])
let groceryItem = try JSONDecoder().decode(GroceryItem.self, from: jsonData)
print(groceryItem)
} catch let error {
print(error)
}
})
Please note that if your JSON keys are not the same as your Decodable struct. You'll need to use CodingKeys. Example:
JSONSnapshotSpinach {
"title": "Spinach",
"price": 10,
"onSale": true
}
struct GroceryItem: Decodable {
var name: String
var price: Double
var onSale: Bool?
enum CodingKeys: String, CodingKey {
case name = "title"
case price
case onSale
}
}
You can find more information on this using Apple Docs here.
No. Firebase returns a FIRDataSnapshot that can't be decodable. You can use this structure however, which is pretty simple and easy to understand:
struct GroceryItem {
let key: String
let name: String
let addedByUser: String
let ref: FIRDatabaseReference?
var completed: Bool
init(name: String, addedByUser: String, completed: Bool, key: String = "") {
self.key = key
self.name = name
self.addedByUser = addedByUser
self.completed = completed
self.ref = nil
}
init(snapshot: FIRDataSnapshot) {
key = snapshot.key
let snapshotValue = snapshot.value as! [String: AnyObject]
name = snapshotValue["name"] as! String
addedByUser = snapshotValue["addedByUser"] as! String
completed = snapshotValue["completed"] as! Bool
ref = snapshot.ref
}
func toAnyObject() -> Any {
return [
"name": name,
"addedByUser": addedByUser,
"completed": completed
]
}
}
And use toAnyObject() to save your item:
let groceryItemRef = ref.child("items")
groceryItemRef.setValue(groceryItem.toAnyObject())
Source: https://www.raywenderlich.com/139322/firebase-tutorial-getting-started-2
Or you can use this solution for children
extension DatabaseReference {
func makeSimpleRequest<U: Decodable>(completion: #escaping (U) -> Void) {
self.observeSingleEvent(of: .value, with: { snapshot in
guard let object = snapshot.children.allObjects as? [DataSnapshot] else { return }
let dict = object.compactMap { $0.value as? [String: Any] }
do {
let jsonData = try JSONSerialization.data(withJSONObject: dict, options: [])
let parsedObjects = try JSONDecoder().decode(U.self, from: jsonData)
completion(parsedObjects)
} catch let error {
print(error)
}
})
}
}
and use
self.refPriceStatistics.child(productId).makeSimpleRequest { (parsedArray: [YourArray]) in
callback(parsedArray)
}
If your data type is Codable you can use the following solution to decode directly. You do not need any plugin. I used the solution for Cloud Firestore.
import Firebase
import FirebaseFirestoreSwift
let db = Firestore.firestore()
let query = db.collection("CollectionName")
.whereField("id", isEqualTo: "123")
guard let documents = snapshot?.documents, error == nil else {
return
}
if let document = documents.first {
do {
let decodedData = try document.data(as: ModelClass.self)
// ModelClass a Codable Class
}
catch let error {
//
}
}
You can convert the value returned by Firebase to Data, and then decode that.
Add this extension to your project:
extension Collection {
//Designed for use with Dictionary and Array types
var jsonData: Data? {
return try? JSONSerialization.data(withJSONObject: self, options: .prettyPrinted)
}
}
Then use it to convert the value of the observed snapshot into data, which can then be decoded:
yourRef.observe(.value) { (snapshot) in
guard snapshot.exists(),
let value = snapshot.value as? [String],
let data = value.jsonData else {
return
}
//cast to expected type
do {
let yourNewObject = try JSONDecoder().decode([YourClass].self, from: data)
} catch let decodeError {
print("decodable error")
}
}
You can use this library CodableFirebase or the following extension can be helpful.
extension JSONDecoder {
func decode<T>(_ type: T.Type, from value: Any) throws -> T where T : Decodable {
do {
let data = try JSONSerialization.data(withJSONObject: value, options: .prettyPrinted)
let decoded = try decode(type, from: data)
return decoded
} catch {
throw error
}
}
I am attempting to parse JSON with codable in Swift. I have successfully done this before, but I have a more complicated JSON object with some arrays and I am having trouble.
Here is my JSON:
{
"data": [ {
"type":"player",
"id":"account.7e5b92e6612440349afcc06b7c390114",
"attributes": {
"createdAt":"2018-04-06T04:59:40Z",
"name":"bob",
"patchVersion":"",
"shardId":"pc-na",
"stats":null,
"titleId":"bluehole-pubg",
"updatedAt":"2018-04-06T04:59:40Z"
},
"relationships": {
"assets": {
"data":[]
},
"matches": {
"data": [
{"type":"match","id":"3e2a197a-1453-4569-b35b-99e337dfabc5"},
{"type":"match","id":"15f41d2f-9da2-4b95-95ca-b85e297e14b7"},
{"type":"match","id":"a42c496c-ad92-4d3e-af1f-8eaa2e200c2b"}
{"type":"match","id":"b6e33df5-4754-49da-9a0f-144842bfc306"},
{"type":"match","id":"5b357cd1-35fe-4859-a2d7-48f263120bbd"},
{"type":"match","id":"99fc5f81-c24c-4c82-ae03-cd21c94469c0"},
{"type":"match","id":"1851c88e-6fed-48e8-be84-769f20f5ee6f"},
{"type":"match","id":"e16db7ea-520f-4db0-b45d-649264ac019c"},
{"type":"match","id":"6e61a7e7-dcf5-4df5-aa88-89eca8d12507"},
{"type":"match","id":"dcbf8863-9f7c-4fc9-b87d-93fe86babbc6"},
{"type":"match","id":"0ba20fbb-1eaf-4186-bad5-5e8382558564"},
{"type":"match","id":"8b104f3b-66d5-4d0a-9992-fe053ab4a6ca"},
{"type":"match","id":"79822ea7-f204-47f8-ae6a-7efaac7e9c90"},
{"type":"match","id":"1389913c-a742-434a-80c5-1373e115e3b6"}
]
}
},
"links": {
"schema":"",
"self":"https://api.playbattlegrounds.com/shards/pc-na/players/account.7e5b92e6612440349afcc06b7c390114"
}
}],
"links": {
"self":"https://api.playbattlegrounds.com/shards/pc-na/players?filter[playerNames]=dchilds64"
},
"meta":{}
}
Here are the models I am using:
public struct PlayerResponse: Codable {
let data: [Player]
}
For Player:
public struct Player: Codable {
let type: String
let id: String
let attributes: Attributes
let relationships: Relationships
}
For Attributes:
public struct Attributes: Codable {
let name: String
let patchVersion: String
let shardId: String
let titleId: String
let updatedAt: String
}
For Relationships:
public struct Relationships: Codable {
let matches: Matches
}
For Matches:
public struct Matches: Codable {
let data: [Match]
}
For Match:
public struct Match: Codable {
let type: String
let id: String
}
Decoding as:
let players = try decoder.decode([Player].self, from: jsonData)
I have this function which runs my network request:
func getPlayerData(for name: String, completion: ((Result<[Player]>) -> Void)?) {
var urlComponents = URLComponents()
urlComponents.scheme = "https"
urlComponents.host = "api.playbattlegrounds.com"
urlComponents.path = "/shards/\(regionShard.rawValue)/players"
let playerNameItem = URLQueryItem(name: "filter[playerNames]", value: "\(name)")
urlComponents.queryItems = [playerNameItem]
guard let url = urlComponents.url else { fatalError("Could not create URL from components") }
print(url)
var request = URLRequest(url: url)
request.httpMethod = "GET"
request.setValue("bearer \(apiKey)", forHTTPHeaderField: "Authorization")
request.setValue("application/vnd.api+json", forHTTPHeaderField: "Accept")
let config = URLSessionConfiguration.default
let session = URLSession(configuration: config)
let task = session.dataTask(with: request) { (responseData, response, responseError) in
DispatchQueue.main.async {
if let error = responseError {
completion?(.failure(error))
} else if let jsonData = responseData {
let decoder = JSONDecoder()
do {
let players = try decoder.decode([Player].self, from: jsonData)
completion?(.success(players))
} catch {
completion?(.failure(error))
}
} else {
let error = NSError(domain: "", code: 0, userInfo: [NSLocalizedDescriptionKey : "Data was not retrieved from request"]) as Error
completion?(.failure(error))
}
}
}
task.resume()
}
The problem I am facing is that I get this error when I try to run the network request:
I think there is an issue with my codable structs, but I'm not sure. Could someone point me in the right direction to look for my error?
I suggest you build this up from the ground, since the errors of JSONDecoder (as with any compiler) get worse the more involved your structures are. Let's see how far we get:
Your Match struct is pretty sound:
public struct Match: Codable {
let type: String
let id: String
}
let decoder = JSONDecoder()
let mData = """
{"type":"match","id":"3e2a197a-1453-4569-b35b-99e337dfabc5"}
""".data(using:.utf8)!
let match = try! decoder.decode(Match.self, from:mData)
print(match)
No unexpected problems here. Shortening Matches a bit you already get your first error, rather an unexpected one
public struct Matches: Codable {
let data: [Match]
}
let mtchsData = """
{
"data": [
{"type":"match","id":"3e2a197a-1453-4569-b35b-99e337dfabc5"},
{"type":"match","id":"15f41d2f-9da2-4b95-95ca-b85e297e14b7"},
{"type":"match","id":"a42c496c-ad92-4d3e-af1f-8eaa2e200c2b"}
{"type":"match","id":"b6e33df5-4754-49da-9a0f-144842bfc306"},
{"type":"match","id":"5b357cd1-35fe-4859-a2d7-48f263120bbd"}
]
}
""".data(using:.utf8)!
do {
let mtches = try decoder.decode(Matches.self, from:mtchsData)
print(mtches)
} catch {
print(error)
}
will print the following error:
"dataCorrupted(Swift.DecodingError.Context(codingPath: [],
debugDescription: "The given data was not valid JSON.",
underlyingError: Optional(Error Domain=NSCocoaErrorDomain Code=3840
"Badly formed array around character 233."
UserInfo={NSDebugDescription=Badly
formed array around character 233.})))\n"
This is a trivial error, you are missing a comma on line 3 of the data Array. Adding that all will go well, but if it comes like this from your service you will have to fix it first.
I guess you get the idea and know your way about building up the structure successively. On the top level you will notice that your top level structure goes beyond an array of Player, it is actually a Dictionary with "data" as its sole key as you modelled correctly in PlayerResponse as #AnkitJayaswal pointed out already. That makes two errors already, those are the ones I managed to spot easily, but as I suggested before you should continue the build up of tests, that way you will know that the "lower" levels parse correctly and can concentrate on the problem at hand.
All of the above works easily in a Playground and there is no need to actually call the WebService in the process. Of course you will have to import Cocoa, but you already knew that. Anyway it always helps to reduce the level of complexity by splitting up your problem into smaller parts.
As I can see your whole player response is in key data. And your parsing player info with Player codable struct directly rather than data key which is used in PlayerResponse codable struct.
To resolve this update your code as:
let players = try decoder.decode(PlayerResponse.self, from: jsonData)
Hope this will solve your problem.
I am trying to decode data from a Firebase DataSnapshot so that it can be decoded using JSONDecoder.
I can decode this data fine when I use a URL to access it with a network request (obtaining a Data object).
However, I want to use the Firebase API to directly obtain the data, using observeSingleEvent as described on this page.
But, when I do this, I cannot seem to convert the result into a Data object, which I need to use JSONDecoder.
Is it possible to do the new style of JSON decoding with a DataSnapshot? How is it possible? I can't seem to figure it out.
I have created a library called CodableFirebase that provides Encoders and Decoders that are designed specifically for Firebase.
So for the example above:
import Firebase
import CodableFirebase
let item: GroceryItem = // here you will create an instance of GroceryItem
let data = try! FirebaseEncoder().encode(item)
Database.database().reference().child("pathToGraceryItem").setValue(data)
And here's how you will read the same data:
Database.database().reference().child("pathToGraceryItem").observeSingleEvent(of: .value, with: { (snapshot) in
guard let value = snapshot.value else { return }
do {
let item = try FirebaseDecoder().decode(GroceryItem.self, from: value)
print(item)
} catch let error {
print(error)
}
})
I've converted Firebase Snapshots using JSONDecoder by converting snapshots back to JSON in Data format. Your struct needs to conform to Decodable or Codable. I've done this with SwiftyJSON but this example is using JSONSerialization and it still works.
JSONSnapshotPotatoes {
"name": "Potatoes",
"price": 5,
}
JSONSnapshotChicken {
"name": "Chicken",
"price": 10,
"onSale": true
}
struct GroceryItem: Decodable {
var name: String
var price: Double
var onSale: Bool? //Use optionals for keys that may or may not exist
}
Database.database().reference().child("grocery_item").observeSingleEvent(of: .value, with: { (snapshot) in
guard let value = snapshot.value as? [String: Any] else { return }
do {
let jsonData = try JSONSerialization.data(withJSONObject: value, options: [])
let groceryItem = try JSONDecoder().decode(GroceryItem.self, from: jsonData)
print(groceryItem)
} catch let error {
print(error)
}
})
Please note that if your JSON keys are not the same as your Decodable struct. You'll need to use CodingKeys. Example:
JSONSnapshotSpinach {
"title": "Spinach",
"price": 10,
"onSale": true
}
struct GroceryItem: Decodable {
var name: String
var price: Double
var onSale: Bool?
enum CodingKeys: String, CodingKey {
case name = "title"
case price
case onSale
}
}
You can find more information on this using Apple Docs here.
No. Firebase returns a FIRDataSnapshot that can't be decodable. You can use this structure however, which is pretty simple and easy to understand:
struct GroceryItem {
let key: String
let name: String
let addedByUser: String
let ref: FIRDatabaseReference?
var completed: Bool
init(name: String, addedByUser: String, completed: Bool, key: String = "") {
self.key = key
self.name = name
self.addedByUser = addedByUser
self.completed = completed
self.ref = nil
}
init(snapshot: FIRDataSnapshot) {
key = snapshot.key
let snapshotValue = snapshot.value as! [String: AnyObject]
name = snapshotValue["name"] as! String
addedByUser = snapshotValue["addedByUser"] as! String
completed = snapshotValue["completed"] as! Bool
ref = snapshot.ref
}
func toAnyObject() -> Any {
return [
"name": name,
"addedByUser": addedByUser,
"completed": completed
]
}
}
And use toAnyObject() to save your item:
let groceryItemRef = ref.child("items")
groceryItemRef.setValue(groceryItem.toAnyObject())
Source: https://www.raywenderlich.com/139322/firebase-tutorial-getting-started-2
Or you can use this solution for children
extension DatabaseReference {
func makeSimpleRequest<U: Decodable>(completion: #escaping (U) -> Void) {
self.observeSingleEvent(of: .value, with: { snapshot in
guard let object = snapshot.children.allObjects as? [DataSnapshot] else { return }
let dict = object.compactMap { $0.value as? [String: Any] }
do {
let jsonData = try JSONSerialization.data(withJSONObject: dict, options: [])
let parsedObjects = try JSONDecoder().decode(U.self, from: jsonData)
completion(parsedObjects)
} catch let error {
print(error)
}
})
}
}
and use
self.refPriceStatistics.child(productId).makeSimpleRequest { (parsedArray: [YourArray]) in
callback(parsedArray)
}
If your data type is Codable you can use the following solution to decode directly. You do not need any plugin. I used the solution for Cloud Firestore.
import Firebase
import FirebaseFirestoreSwift
let db = Firestore.firestore()
let query = db.collection("CollectionName")
.whereField("id", isEqualTo: "123")
guard let documents = snapshot?.documents, error == nil else {
return
}
if let document = documents.first {
do {
let decodedData = try document.data(as: ModelClass.self)
// ModelClass a Codable Class
}
catch let error {
//
}
}
You can convert the value returned by Firebase to Data, and then decode that.
Add this extension to your project:
extension Collection {
//Designed for use with Dictionary and Array types
var jsonData: Data? {
return try? JSONSerialization.data(withJSONObject: self, options: .prettyPrinted)
}
}
Then use it to convert the value of the observed snapshot into data, which can then be decoded:
yourRef.observe(.value) { (snapshot) in
guard snapshot.exists(),
let value = snapshot.value as? [String],
let data = value.jsonData else {
return
}
//cast to expected type
do {
let yourNewObject = try JSONDecoder().decode([YourClass].self, from: data)
} catch let decodeError {
print("decodable error")
}
}
You can use this library CodableFirebase or the following extension can be helpful.
extension JSONDecoder {
func decode<T>(_ type: T.Type, from value: Any) throws -> T where T : Decodable {
do {
let data = try JSONSerialization.data(withJSONObject: value, options: .prettyPrinted)
let decoded = try decode(type, from: data)
return decoded
} catch {
throw error
}
}