I can't find online how to store an array of objects so that the key "line_items" presents numbers for each menuItem with values for each menuItem corresponding to its own number. In other words, I need the numbers to come after line_items rather than the nested key so that each individual MenuItem object can be quickly referenced. I found online how to make it so each key has an array of values, but I need line_items to have an array of MenuItem objects. The following code crashes:
public func uploadTransactionData(_ menuItems: [MenuItem], balanceId: String, subTotal: Int, completion: #escaping (() -> ())) {
guard let userId = Auth.auth().currentUser?.uid else { completion(); return }
let utilitiesManager = UtilitiesManager()
let timestamp = utilitiesManager.timestamp()
let params: [String: Any] = ["date": "\(timestamp)",
"balance_id": "\(balanceId)",
"subtotal": "\(subTotal)",
"user_id": "\(userId)",
"line_items": menuItems
]
Firestore.firestore().document("transaction_history/\(timestamp)").setData(params)
{ err in
if let e = err {
print("$-- error creating user \(e)")
completion()
} else {
completion()
}
}
}
Here's the MenuItem model:
struct MenuItem {
let itemId: String
let name: String
var modifiers: [String]?
var photoName: String?
var photoUrl: String?
var quantity: Int
var price: Int
var sizeAddOnPrice: Int
var toppingsAddOnPrice: Int
let description: String
var size: String
let category: String
init(itemId: String, name: String, modifiers: [String]?, photoName: String?, photoUrl: String?, quantity: Int, price: Int, sizeAddOnPrice: Int, toppingsAddOnPrice: Int, description: String, size: String, category: String) {
self.itemId = itemId
self.name = name
self.modifiers = modifiers
self.photoName = photoName
self.photoUrl = photoUrl
self.quantity = quantity
self.price = price
self.sizeAddOnPrice = sizeAddOnPrice
self.toppingsAddOnPrice = toppingsAddOnPrice
self.description = description
self.size = size
self.category = category
}
Problem:
Your app is crashing because you are trying to save user defined object MenuItem to Firestore. Firestore doesn't allow it. Firestore only supports this datatypes.
Solution:
You can convert your custom object MenuItem to Firestore supported datatypes.
You can do this by making following changes to your code.
Make MenuItem confirm to Codable protocol.
struct MenuItem: Codable {
// Your code as it is.
}
Make following changes to your uploadTransactionData() function:
public func uploadTransactionData(_ menuItems: [MenuItem], balanceId: String, subTotal: Int, completion: #escaping (() -> ())) {
let userId = Auth.auth().currentUser?.uid else { completion(); return }
let utilitiesManager = UtilitiesManager()
let timestamp = utilitiesManager.timestamp()
var list_menuItem = [Any]()
for item in menuItems {
do {
let jsonData = try JSONEncoder().encode(item)
let jsonObject = try JSONSerialization.jsonObject(with: jsonData, options: [])
list_menuItem.append(jsonObject)
}
catch {
// handle error
}
}
let params: [String: Any] = ["date": "\(timestamp)",
"balance_id": "\(balanceId)",
"subtotal": "\(subTotal)",
"user_id": "\(userId)",
"line_items": list_menuItem
]
Firestore.firestore().document("transaction_history/\(timestamp)").setData(params)
{ err in
if let e = err {
print("$-- error creating user \(e)")
completion()
} else {
completion()
}
}
}
This is because Firestore doesn't know how to save the value: menuItems
you can map it like this: "objectExample": [
"a": 5,
"b": [
"nested": "foo"
]
]
or:
.setData([
"name": "Frank",
"favorites": [ "food": "Pizza", "color": "Blue", "subject": "recess" ],
"age": 12
])
Related
I'm new to the Firebase realtime database and relatively new to Swift in general. I am attempting to build a song request app in which users can create events for guests to request songs from the Spotify API. I'm trying to write an Event object to Firebase, which contains nested objects and arrays of different types. However, when it writes to the database, it only writes the strings and none of the arrays or objects. What is the best way to write all this information to the Firebase Database in a nested structure, so that whenever users add song requests, I can edit the array of requests for the given event in firebase.
Here is my code:
Event.swift
struct Event: Codable{
var code: String
var name: String
var host: String
var description: String
var hostUserId: String
var guestIds: [String]
var requests: [Request]
var queue: [Request]
var played: [Request]
//private var allowExplicit: Bool
//private var eventLocation
init(code: String, name: String, host: String, description: String, hostUserId: String){
self.code = code
self.name = name
self.host = host
self.description = description
self.hostUserId = hostUserId
self.guestIds = []
self.requests = []
self.queue = []
self.played = []
}
func toAnyObject() -> Any{
var guestIdsDict: [String:String] = [:]
for id in guestIds{
guestIdsDict[id] = id
}
var requestsDict: [String: Any] = [:]
for request in requests{
requestsDict[request.getId()] = request.toAnyObject()
}
var queueDict: [String: Any] = [:]
for request in queue{
queueDict[request.getId()] = request.toAnyObject()
}
var playedDict: [String: Any] = [:]
for request in played{
playedDict[request.getId()] = request.toAnyObject()
}
return [
"code": code,
"name": name,
"host": host,
"description": description,
"hostUserId": hostUserId,
"guestIds": guestIdsDict,
"requests": requestsDict,
"queue":queueDict,
"played":playedDict
]
}
}
Request.swift
struct Request: Codable{
private var name: String
private var id: String
private var explicit: Bool
private var album: Album
private var artists: [Artist]
private var likes: Int
init(name: String, id: String, explicit: Bool, album: Album, artists: [Artist]){
self.name = name
self.id = id
self.explicit = explicit
self.album = album
self.artists = artists
self.likes = 1
}
func toAnyObject() -> Any{
var artistsDict: [String:Any] = [:]
for artist in artists {
artistsDict[artist.id] = artist.toAnyObject()
}
return [
"name": name,
"id": id,
"explicit": explicit,
"album": album.toAnyObject(),
"artists": artistsDict,
"likes": likes
]
}
mutating func like(){
self.likes += 1
}
mutating func unlike(){
self.likes -= 1
if(self.likes < 0){
self.likes = 0
}
}
mutating func setLikes(count: Int){
self.likes = count
}
func getLikes() -> Int{
return self.likes
}
func getName() -> String{
return self.name
}
func getId() -> String{
return self.id
}
func getExplicit() -> Bool{
return self.explicit
}
func getAlbum() -> Album {
return self.album
}
func getImages() -> [Image] {
return self.album.images
}
func getArtists() -> [Artist] {
return self.artists
}
func getArtistString() -> String{
var artistString = ""
for (i, artist) in self.artists.enumerated(){
artistString += artist.name
if(i != self.artists.endIndex-1){
artistString += ", "
}
}
return artistString
}
}
Album.swift
struct Album: Codable{
let name: String
let images: [Image]
func toAnyObject() -> Any{
var imagesDict: [String: Any] = [:]
for image in images{
imagesDict[image.url] = image.toAnyObject()
}
return [
"name": name,
"images": imagesDict
]
}
}
Artist.swift
struct Artist: Codable{
let id: String
let name: String
func toAnyObject() -> Any{
return ["id": id, "name": name]
}
}
Image.swift
struct Image: Codable{
let height: Int
let url: String
let width: Int
func toAnyObject() -> Any{
return ["height": height, "url": url, "width": width]
}
}
As you are using Codable, you can create a dic out of it as follows:
Step 1: Add this extension to your code
extension Encodable {
var dictionary: [String: Any]? {
guard let data = try? JSONEncoder().encode(self) else { return nil }
return (try? JSONSerialization.jsonObject(with: data, options: .allowFragments)).flatMap { $0 as? [String: Any] }
}
}
Step 2: Write below code in your Struct (this you have to do in every struct or you can modify code as per your need).
func createDic() -> [String: Any]? {
guard let dic = self.dictionary else {
return nil
}
return dic
}
Now with the help of struct obj, call createDic() method and you will get a dictionary.
And you can send this dictionary to the firebase.
FULL CODE EXAMPLE:
extension Encodable {
var dictionary: [String: Any]? {
guard let data = try? JSONEncoder().encode(self) else { return nil }
}
struct LoginModel: Codable {
let email: String
let password: String
func createDic() -> [String: Any]? {
guard let dic = self.dictionary else {
return nil
}
return dic
}
}
Please comment if you have any questions.
Happy to help!
How do I handle this JSON and parse this JSON using decoder in Swift 4? I tried several times but failed. I don't understand how to handle this JSON format.
[
{
products: {
id: 69,
name: "test",
des: "Hi this is a test",
sort_des: "this is a test category",
},
documents: {
0: {
id: 1,
name: "105gg_1992uu",
citation: "This is citation for 105gg_1992uu",
file: "105gg_1992uu.pdf",
created_at: "2019-01-25 09:07:09",
category_id: 69,
},
1: {
id: 2,
name: "96tt-1997tt",
citation: "This is citation for 96tt-1997tt",
file: "96tt-1997tt.pdf",
created_at: "2019-01-25 09:07:09",
category_id: 69,
},
},
}
]
I tried the following code.
This is my model class.
struct GenericCodingKeys: CodingKey {
var stringValue: String
var intValue: Int?
init?(stringValue: String) {
self.stringValue = stringValue
}
init?(intValue: Int) {
self.intValue = intValue
self.stringValue = "\(intValue)"
}
}
struct Model : Codable {
struct Documents : Codable {
var id : Int?
var name : String?
var citation : String?
var file : String?
var created_at : String?
var category_id : Int?## Heading ##
private enum CodingKeys : String, CodingKey{
case id = "id"
case name = "name"
case citation = "citation"
case file = "file"
case created_at = "created_at"
case category_id = "category_id"
}
}
struct Products : Codable {
var id : Int?
var name : String?
var des : String?
var sort_des : String?
private enum CodingKeys: String, CodingKey{
case id = "id"
case name = "name"
case des = "des"
case sort_des = "sort_des"
}
}
var products : Products?
var documents : [Documents]?
private enum CodingKeys : String, CodingKey{
case products
case documents
}
init(from decoder: Decoder) throws {
self.documents = [Documents]()
let container = try decoder.container(keyedBy: CodingKeys.self)
self.products = try container.decode(Products.self, forKey: .products)
let documents = try container.nestedContainer(keyedBy: GenericCodingKeys.self, forKey: .documents)
for doc in documents.allKeys{
let docEach = try documents.decode(Documents.self, forKey: doc)
self.documents?.append(docEach)
}
}
}
This is my fetch data from that JSON function
class LatestStatuesVC: UIViewController,UITableViewDelegate,UITableViewDataSource {
#IBOutlet var tableView: UITableView!
var caseData : [Model]?
var model : Model?
var countCaseData = 0
override func viewDidLoad() {
super.viewDidLoad()
downloadAllData()
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return countCaseData
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: ReuseIdentifiers.cellLatestStatues, for: indexPath) as! LatestStatuesTableCell
return cell
}
//MARK: Download all documents into internal directory
func downloadAllData(){
let url = URL(string: URLString.urlForGetDocuments)
URLSession.shared.dataTask(with: url!) { (data, response, err) in
DispatchQueue.main.async {
do{
if err == nil {
let products = try JSONDecoder().decode(Model.Products.self, from: data!)
let documentAll = try JSONDecoder().decode([Model.Documents].self, from: data!)
print(products.name as Any)
self.countCaseData = documentAll.count
for doc in documentAll{
print(doc.name as Any)
print(doc.citation as Any)
}
}
}
catch let err{
print(err)
}
}
}.resume()
}
}
I get this error for this code.
typeMismatch(Swift.Dictionary<Swift.String, Any>, Swift.DecodingError.Context(codingPath: [], debugDescription: "Expected to decode Dictionary<String, Any> but found an array instead.", underlyingError: nil))
The error clearly says that the root object of the JSON is an array but you try to decode a dictionary.
Basically your structs are too complicated. If you want to have documents as an array by getting rid of the numeric dictionary keys just write a custom initializer in the root (Model) struct which decodes documents as dictionary and takes the values sorted by id as the documents array.
struct Model : Decodable {
let products : Product
let documents : [Document]
enum CodingKeys: String, CodingKey { case products, documents }
init(from decoder: Decoder) throws {
let container = try decoder.container(keyedBy: CodingKeys.self)
products = try container.decode(Product.self, forKey: .products)
let documentData = try container.decode([String:Document].self, forKey: .documents)
documents = documentData.values.sorted(by: {$0.id < $1.id})
}
}
struct Product: Decodable {
let id : Int
let name, description, sortDescription : String
let type : String
}
struct Document: Decodable {
let id, categoryId : Int
let name, citation, file : String
let createdAt : Date
}
Then decode the JSON (assuming data represents the JSON as Data), the createdAt values are decoded as Date
let decoder = JSONDecoder()
let dateFormatter = DateFormatter()
dateFormatter.locale = Locale(identifier: "en_US_POSIX")
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
decoder.dateDecodingStrategy = .formatted(dateFormatter)
decoder.keyDecodingStrategy = .convertFromSnakeCase
do {
let modelArray = try decoder.decode([Model].self, from: data)
for model in modelArray {
print("products:",model.products)
print("documents:",model.documents)
}
} catch { print(error) }
The convertFromSnakeCase key decoding strategy converts all snake_cased keys to camelCased struct members without specifying any CodingKeys.
This is my JSON response:
[
[
{
"id": 22,
"request_id": "rqst5c12fc9e856ae1.06631647",
"business_name": "Code Viable",
"business_email": "code#viable.com",
"title": "Apache Load/Ubuntu",
}
],
[
{
"id": 24,
"request_id": "rqst5c130cae6f7609.41056231",
"business_name": "Code Viable",
"business_email": "code#viable.com",
"title": "Load",
}
]
]
This JSON structure got an array inside of an array, the object of the inner array is what I am trying to parse. Here is the my mapper:
struct JobResponseDataObject: Mappable {
init?(map: Map) {
}
var id: Int?
var requestId: String?
var businessName: String?
var businessEmail: String?
mutating func mapping(map: Map) {
id <- map["id"]
requestId <- map["request_id"]
businessName <- map["business_name"]
businessEmail <- map["business_email"]
}
}
I have tried create another mapper struct to hold the array of objects [JobResponseDataObject] and use Alamofire's responseArray with it, but it didn't work. I have also tried prefixing my json id with 0. but that didn't work too. Please help
Thank
So here's the deal...Codable is a pretty cool protocol from Apple to handle parsing JSON responses from APIs. What you're getting back is an array of arrays, so your stuff's gonna be look like this:
[[ResponseObject]]
So anyway, you'd make a struct of your object, like so:
struct ResponseObject: Codable {
let id: Int?
let requestId: String?
let businessName: String?
let businessEmail: String?
let title: String?
}
You'll note I changed the key name a bit (instead of request_id, I used requestId). The reason is JSONDecoder has a property called keyDecodingStrategy which presents an enum of canned decoding strategies you can select from. You'd do convertFromSnakeCase.
Here's code you can dump into a playground to tinker with. Basically, declare your struct, match it up to whatever the keys are in your JSON, declare a decoder, feed it a decoding strategy, and then decode it.
Here's how you could do an Alamofire call:
private let backgroundThread = DispatchQueue(label: "background",
qos: .userInitiated,
attributes: .concurrent,
autoreleaseFrequency: .inherit,
target: nil)
Alamofire.request(url).responseJSON(queue: backgroundThread) { (response) in
guard response.result.error == nil else {
print("💥KABOOM!💥")
return
}
if let data = response.data {
let decoder = JSONDecoder()
decoder.keyDecodingStrategy = .convertFromSnakeCase
do {
let parsedResponse = try decoder.decode([[ResponseObject]].self, from: data)
print(parsedResponse)
} catch {
print(error.localizedDescription)
}
}
}
Here's code you can chuck in a playground.
import UIKit
let json = """
[
[
{
"id": 22,
"request_id": "rqst5c12fc9e856ae1.06631647",
"business_name": "Code Viable",
"business_email": "code#viable.com",
"title": "Apache Load/Ubuntu",
}
],
[
{
"id": 24,
"request_id": "rqst5c130cae6f7609.41056231",
"business_name": "Code Viable",
"business_email": "code#viable.com",
"title": "Load",
}
]
]
"""
struct ResponseObject: Codable {
let id: Int?
let requestId: String?
let businessName: String?
let businessEmail: String?
let title: String?
}
if let data = json.data(using: .utf8) {
let decoder = JSONDecoder()
decoder.keyDecodingStrategy = .convertFromSnakeCase
do {
let parsedResponse = try decoder.decode([[ResponseObject]].self, from: data)
print(parsedResponse)
} catch {
print(error.localizedDescription)
}
}
You should use this JobResponseDataObject struct as [[JobResponseDataObject]] instead of [JobResponseDataObject] - where you are making a property using this struct in your parent struct or class.
You can use Codable here for mapping the JSON response, The JobResponseDataObject struct should look like,
struct JobResponseDataObject: Codable {
var id: Int?
var requestId: String?
var businessName: String?
var businessEmail: String?
var title: String?
private enum CodingKeys: String, CodingKey {
case id = "id"
case requestId = "request_id"
case businessName = "business_name"
case businessEmail = "business_email"
case title = "title"
}
}
let json = JSON(responseJSON: jsonData)
do {
if let value = try? json.rawData(){
let response = try! JSONDecoder().decode([[JobResponseDataObject]].self, from: value)
}
} catch {
print(error.localizedDescription)
}
I am using a free dates API in my project. I am using Decodable to parse the JSON data.
Here I created my struct:-
struct jsonStruct: Decodable {
var message: Bool?
var data: [dateData]
}
struct dateData: Decodable {
var quarter: Int?
var day: String?
var month: String?
}
This is my code to use the decoder:-
let jsonUrlString = "https://api.lrs.org/random-date-generator?lim_quarters=40&source=api-docs"
guard let url = URL(string: jsonUrlString) else { return }
URLSession.shared.dataTask(with: url) { (data, reponse, err) in
guard let data = data else { return }
print(data)
do {
let jsonData = try JSONDecoder().decode([dateData].self, from: data)
print(jsonData)
}
catch let jsonerr {
print("error serrializing error",jsonerr)
}
}.resume()
But I am getting an error in my code. It goes in the catch block only and I am getting this error in my console:-
error serrializing error typeMismatch(Swift.Array, Swift.DecodingError.Context(codingPath: [], debugDescription: "Expected to decode Array but found a dictionary instead.", underlyingError: nil))
I don't understand what I am doing wrong in my code.
API Data:-
{
messages: false,
data: {
2018-01-02: {
quarter: 1,
day: "2",
month: "1",
db: "2018-01-02",
long: "Tuesday, January 2nd, 2018",
unix: 1514876400
},
struct Job: Decodable {
var title: String
var salary: Float
init(title: String, salary: Float) {
self.title = title
self.salary = salary
}
enum CodingKeys: String, CodingKey {
case title, salary
}
}
struct Person: Decodable {
var job: Job
var firstName: String
var lastName: String
var age: Int
init(job: Job, firstName: String, lastName: String, age: Int) {
self.job = job
self.firstName = firstName
self.lastName = lastName
self.age = age
}
enum CodingKeys: String, CodingKey {
case job = "job_information", firstName = "firstname", lastName =
"lastname", age
}
}
let rawData = """
{
"job_information": {
"title": "iOS Developer",
"salary": 5000
},
"firstname": "John",
"lastname": "Doe",
"age": 20
}
""".data(using: .utf8)!
let person = try JSONDecoder().decode(Person.self, from: rawData)
print(person.firstName) // John
print(person.lastName) // Doe
print(person.job.title) // iOS Developer
You need
struct Root: Codable {
let messages: Bool
let data: [String: Datum]
}
struct Datum: Codable {
let quarter: Int
let day, month, db, long: String
let unix: Int
}
let jsonData = try JSONDecoder().decode(Root.self, from: data)
print(jsonData.data.values)
As the root of the json is a dictionary not an array , also data is a dictionary
jsonData.data.forEach {
if $0 == " 2018-01-02" {
print($1.month)
}
}
I want to create one func which i can used with various struct.
I have several struct and I want use one func with all my struct.
I work with Firestore and want use this one func to access the Firestore.
My first struct:
struct Profile {
var name = ""
var surname = ""
var email = ""
var dictionary: [String: Any] {
return [
"name": name,
"surname": surname,
"email": email
]
}
}
extension Profile: DocumentSerializable {
init?(dictionary: [String: Any], id: String) {
let name = dictionary["name"] as? String ?? ""
let surname = dictionary["surname"] as? String ?? ""
let email = dictionary["email"] as? String ?? ""
self.init(name: name,
surname: surname,
email: email)
}
}
My second struct:
struct FavoriteList {
var favoriteList: [String]
var id: String
var dictionary: [String: Any] {
return [
"favoriteList": favoriteList,
"id": id
]
}
}
extension FavoriteList: DocumentSerializable {
init?(dictionary: [String : Any], id: String) {
let favoriteList = dictionary["favorite"] as? [String] ?? [""]
let id = id
self.init(favoriteList: favoriteList, id: id)
}
}
And my func which I used now to load data from firestore:
func observeQuery() {
guard let query = query else { return }
let time = DispatchTime.now() + 0.5
listener = query.addSnapshotListener { [unowned self] (snapshot, error) in
if let snapshot = snapshot {
DispatchQueue.main.asyncAfter(deadline: time) {
let profileModels = snapshot.documents.map { (document) -> Profile in
if let profileModel = Profile(dictionary: document.data(), id: document.documentID) {
return profileModel
} else {
fatalError("Error!")
}
}
self.profile = profileModels
self.document = snapshot.documents
self.tableView.reloadData()
}
}
}
}
So how I can make func observeQuery to use my structs Profile or FavouriteList?
You can use Generic Functions :
func observeQuery<T>(someObject: T) {
if someObject is Profile {
//do something
} else if someObject is FavouriteList {
//do something
}
}