I have problem with nested json decoding. Im getting no error but response is empty { }. Down bellow is my sample json and struct.
{
"categories": [
{
"ID": 130,
"data": [
{
"en": [
{
"title": "test"
}
],
"fr": [
{
"title": "teste"
}
]
}
],
"lifts": [
{
"ID": 104,
"data": [
{
"en": [
{
"code": "test",
"title": "test"
}
],
"fr": [
{
"code": "test",
"title": "test"
}
]
}
]
},
{
"ID": 105,
"data": [
{
"en": [
{
"code": "test",
"title": "test"
}
],
"fr": [
{
"code": "test",
"title": "test"
}
]
}
]
}
]
}
And this is my struct
struct jsonResponse : Codable {
struct Categories : Codable {
let id : Int
let data : [LanguageData]
let lifts : [Lifts]
struct LanguageData : Codable {
let en, fr : [Data]
struct Data : Codable {
let code : String?
let title : String?
}
}
struct LiftsData : Codable {
let id : Int
let data : [LanguageData]
}
}
Then Im trying to decode JSON like this:
let lifts = try JSONDecoder().decode(jsonResponse.self, from: data)
But when I print lifts, i see only empty {}. Also no error message during decoding, so have no idea what can be wrong.
Related
Here i provide the code worked sample as per the guideline given below and seems to get null values.
Here is my complete JSON Data,
some: {
"success": true,
"data":
[
{
"15-10-2020": [
{
"id": 100,
"details": {
"_id": 1,
"_title": "My Title"
},
"created_at": "2020-10-15"
},
{
"snf_id": 101,
"details": {
"_id": 1,
"_title": "My Title"
},
"created_at": "2020-10-15"
},
{
"snf_id": 102,
"details": {
"_id": 1,
"_title": "My Title"
},
"created_at": "2020-10-15"
}
],
"30-09-2020": [
{
"snf_id": 301,
"details": {
"_id": 8,
"_title": "My Title"
},
"created_at": "2020-09-30"
}
]
}
],
"message": "Successfully Retrieved"
}
struct Response : Codable {
var success : Bool?
var data : [Data]?
var message : String?
}
struct Data: Codable {
var snf_id: Int?
var details: Details?
var created_at: String?
}
// MARK: - Details
struct Details: Codable {
var _id: Int?
var _title: String?
}
let Response = try JSONDecoder().decode(Response.self, from: data)
Returns null value for data,
▿ Response
▿ success : Optional
- some : true
▿ data : Optional<Array>
▿ some : 1 element
▿ 0 : Data
- snf_id : nil
- details : nil
- created_at : nil
▿ message : Optional
- some : "Successfully Retrieved"
There is no myData key in your json , your json top structure is an array that contains elements where every element value is an array like [[String: [Root]]]
struct Root: Codable {
let id: Int?
let details: Details
let createdAt: String
let snfID: Int?
enum CodingKeys: String, CodingKey {
case id, details
case createdAt = "created_at"
case snfID = "snf_id"
}
}
// MARK: - Details
struct Details: Codable {
let id: Int
let title: String
enum CodingKeys: String, CodingKey {
case id = "_id"
case title = "_title"
}
}
And to decode
let res = try JSONDecoder().decode([[String: [Root]]].self,from:data)
some: {
"success": true,
"data":
[
{
"15-10-2020": [
{
"id": 100,
"details": {
"_id": 1,
"_title": "My Title"
},
"created_at": "2020-10-15"
},
{
"snf_id": 101,
"details": {
"_id": 1,
"_title": "My Title"
},
"created_at": "2020-10-15"
},
{
"snf_id": 102,
"details": {
"_id": 1,
"_title": "My Title"
},
"created_at": "2020-10-15"
}
],
"30-09-2020": [
{
"snf_id": 301,
"details": {
"_id": 8,
"_title": "My Title"
},
"created_at": "2020-09-30"
}
]
}
],
"message": "Successfully Retrieved"
}
struct Response : Codable {
var success : Bool?
**var data : [[String:[Data]]]?**
var message : String?
}
struct Data: Codable {
var snf_id: Int?
var details: Details?
var created_at: String?
}
// MARK: - Details
struct Details: Codable {
var _id: Int?
var _title: String?
}
let Response = try JSONDecoder().decode(Response.self, from: data)
i am getting data from an api like this
[
{
"internData": {
"id": "abc123",
"name": "Doctor"
},
"author": "Will smith",
"description": "Is an actor",
"url": "https://www",
},
{
"internData": {
"id": "qwe900",
"name": "Constructor"
},
"author": "Edd Bett",
"description": "Is an Constructor",
"url": "https://www3",
}
]
I have my model like this
struct PersonData: Codable {
let author: String?
let description: String?
let url: String?
}
But I dont know how to define the "internData", I tried with another Model "InterData" and define id and name like the PersonData, but i get an error, i tried also with [String:Any] but i get an error for the Codable protocol
I am using
let resP = try JSONSerialization.jsonObject(with: data, options: .init()) as? [String: AnyObject]
print("resP", )
in my script of Service/Network
Thanks if somebody knows
You can't use [String:Any] type in case of Codable. you need to create an another model of InternData, which is used by PersonData.
Code:
JSON Data :
let jsonData =
"""
[
{
"internData": {
"id": "abc123",
"name": "Doctor"
},
"author": "Will smith",
"description": "Is an actor",
"url": "https://www",
},
{
"internData": {
"id": "qwe900",
"name": "Constructor"
},
"author": "Edd Bett",
"description": "Is an Constructor",
"url": "https://www3",
}
]
"""
// Models
struct PersonData: Codable {
let author: String?
let description: String?
let url: String?
let internData : InternData?
}
// New model
struct InternData : Codable {
let id : String?
let name : String?
}
// Parsing
do {
let parseRes = try JSONDecoder().decode([PersonData].self, from: Data(jsonData.utf8))
print(parseRes)
}
catch {
print(error)
}
To parse a JSON, as I found also on the web, I usually used this kind of code:
guard let results = receivedUserJSON["results"] as? [String: Any] else {
print("Error interpreting results")
return
}
This time I have a problem, because it seems to end in the else of this guard let. The JSON has the following structure:
{
"results": [{
"gender": "female",
"name": {
"title": "mrs",
"first": "silene",
"last": "almeida"
},
"location": {
"street": "2594 rua maranhão ",
"city": "pouso alegre",
"state": "distrito federal",
"postcode": 20447,
"coordinates": {
"latitude": "-70.0198",
"longitude": "123.6577"
},
"timezone": {
"offset": "+4:30",
"description": "Kabul"
}
},
"email": "silene.almeida#example.com",
"login": {
"uuid": "d06a46b3-1c00-42be-b8fc-d271bf901f7d",
"username": "silversnake251",
"password": "ventura",
"salt": "UcckU6RG",
"md5": "7c8c4129587c61da01ca7cf4f88353c5",
"sha1": "6cbf7ec377ff4ebad5a392ec487343bf613858ef",
"sha256": "8dedf3649fb833a1936b8885627b86c6cf02062eb74f727b2cbd674a30f73e75"
},
"dob": {
"date": "1969-07-13T00:58:26Z",
"age": 49
},
"registered": {
"date": "2003-09-28T09:44:56Z",
"age": 15
},
"phone": "(95) 0094-8716",
"cell": "(20) 1014-3529",
"id": {
"name": "",
"value": null
},
"picture": {
"large": "https://randomuser.me/api/portraits/women/66.jpg",
"medium": "https://randomuser.me/api/portraits/med/women/66.jpg",
"thumbnail": "https://randomuser.me/api/portraits/thumb/women/66.jpg"
},
"nat": "BR"
}],
"info": {
"seed": "dd971cddf636d2d7",
"results": 1,
"page": 1,
"version": "1.2"
}
}
What should I do to properly parse this JSON? I would prefer not to go for the Codable solution because I don't need all of these values.
PS: I know the json is correct because I tried and printed it with:
if let JSONString = String(data: responseData, encoding: String.Encoding.utf8) {
print(JSONString)
}
results is an array
guard let results = receivedUserJSON["results"] as? [[String:Any]] else {
print("Error interpreting results")
return
}
I see no value for it to be an array as it contains 1 element so you may think to alter this json
current strucsture
{
"results": [{}],
"info": {
"seed": "dd971cddf636d2d7",
"results": 1,
"page": 1,
"version": "1.2"
}
}
you may alter it to
{
"results": {},
"info": {
"seed": "dd971cddf636d2d7",
"results": 1,
"page": 1,
"version": "1.2"
}
}
I get JSON data as follows:
{
"upcoming": [
{
"id": "17",
"date": "2018/04/23 13:25",
"title": "Team A"
},
{
"id": "20",
"date": "2018/04/23 13:25",
"title": "Team B"
},
{
"id": "10",
"date": "2019/06/16 21:45",
"title": "Team c"
}
]
}
I need to show a table view with sections according to the date key. How can I populate a table view with sections and rows accordingly?
Swift comes with the amazing Codable protocol built in, you should read up on it. This will easily allow you to understand what is going on in this Playground:
import Cocoa
let jsonData = """
{
"upcoming": [
{
"id": "17",
"date": "2018/04/23 13:25",
"title": "Team A"
},
{
"id": "20",
"date": "2018/04/23 13:25",
"title": "Team B"
},
{
"id": "10",
"date": "2019/06/16 21:45",
"title": "Team c"
}
]
}
""".data(using: .utf8)!
struct Match : Codable {
let id: String
let date: String
let title: String
}
struct Matches : Codable {
let upcoming: [Match]
}
do {
let matches = try JSONDecoder().decode(Matches.self, from:jsonData)
print(matches.upcoming.count)
} catch {
print(error)
}
Now your matches.upcoming are your model array and using it as a TableView datasource is really straightforward.
This is my json to parse (example):
[
{
"id": 1,
"name": "Team name",
"shower": {
"id": 1,
"status": 1,
"startLocation": {
"id": 1,
"name": "abc 16"
}
}
},
{
"id": 2,
"name": "Team name",
"shower": {
"id": 2,
"status": 1,
"startLocation": {
"id": 1,
"name": "efg 16"
}
}
}
]
paste it this json viewer to view it easily.
as you can see, it is an array (of teams).
I need to get each team and do something with it.
After many attempts, I tried using SwiftyJSON, because I thought it will be easier. But, it did not worked for me.
This is what I tried:
let array = JSON(response)
// print each subJSON in array
for team in array.arrayValue {
print(team)
}
But the loop does not work. It does not go in to the loop at all.
Maybe it does not understand that my json is an array.
I can see the array object in the debugger. It looks like this:
How can I get these sub-JSONs?
Thanks.
I think you should use
let array = JSON(parseJSON: response)
instead of
let array = JSON(response)
SwiftyJSON contains methods to parse JSON string into a JSON object, check documentation
/**
Parses the JSON string into a JSON object
- parameter json: the JSON string
- returns: the created JSON object
*/
public init(parseJSON jsonString: String) {
if let data = jsonString.data(using: .utf8) {
self.init(data)
} else {
self.init(NSNull())
}
}
/**
Creates a JSON from JSON string
- parameter string: Normal json string like '{"a":"b"}'
- returns: The created JSON
*/
#available(*, deprecated: 3.2, message: "Use instead `init(parseJSON: )`")
public static func parse(json: String) -> JSON {
return json.data(using: String.Encoding.utf8)
.flatMap{ JSON(data: $0) } ?? JSON(NSNull())
}
or alternatively you can convert son string into son object like
Swift 3:
let dataFromString = response.data(using: .utf8)
let jsonArray = JSON(data: dataFromString!)
In the following example, I save team names in an array. I've tested it.
var names = [String]()
if let array = json.array {
for i in 0..<array.count {
let name = array[i]["name"]
names.append(name.stringValue)
}
}
print(names) // ["Team name", "Team name"]
Here is the answer for Swift 5. In My case data response is something like below :
[
{
"Name": "Some Type",
"Data": [
{
"ParentId": 111,
"Code": "Personal",
"SortOrder": 1,
"Name": "Personal",
"Id": 323
},
{
"ParentId": null,
"Code": "Work",
"SortOrder": 2,
"Name": "Work",
"Id": 324
}
],
"KeyType": "Integer"
},
{
"Name": "Phone Type",
"Data": [
{
"ParentId": null,
"Code": "Phone",
"SortOrder": 1,
"Name": "Phone",
"Id": 785
},
{
"ParentId": null,
"Code": "Cell",
"SortOrder": 2,
"Name": "Cell",
"Id": 786
},
{
"ParentId": null,
"Code": "Fax",
"SortOrder": 3,
"Name": "Fax",
"Id": 787
},
{
"ParentId": null,
"Code": "Home",
"SortOrder": 4,
"Name": "Home",
"Id": 788
},
{
"ParentId": null,
"Code": "Office",
"SortOrder": 5,
"Name": "Office",
"Id": 789
}
],
"KeyType": "Integer"
}
]
I was handled it with following code.
struct responseObjectClass:BaseModel {
var responsearray: [arrayData]? = nil
init(json: JSON) {
responsearray = json.arrayValue.map { arrayData(json: $0) }
}
}
struct arrayData:BaseModel {
let Name: String?
var DataValue: [DataLookup]? = nil
let KeyType: String?
init(json: JSON) {
Name = json["Name"].stringValue
DataValue = json["Data"].arrayValue.map { DataLookup(json: $0) }
KeyType = json["KeyType"].stringValue
}
}
struct DataLookup:BaseModel {
let ParentId: Any?
let Code: String?
let SortOrder: Int?
let Name: String?
let Id: Int?
init(json: JSON) {
ParentId = json["ParentId"]
Code = json["Code"].stringValue
SortOrder = json["SortOrder"].intValue
Name = json["Name"].stringValue
Id = json["Id"].intValue
}
}
BaseModel is Optional it's just used for init Json.
protocol BaseModel {
init(json: JSON)
}
Without SwiftyJSON
Below is the valid JSON
data.json File
[{
"id": 1,
"name": "Team name",
"shower": {
"id": 1,
"status": 1,
"startLocation": {
"id": 1,
"name": "abc 16"
}
}
}, {
"id": 2,
"name": "Team name",
"shower": {
"id": 2,
"status": 1,
"startLocation": {
"id": 1,
"name": "efg 16"
}
}
}]
Below is the code to read your json.
if let path = Bundle.main.path(forResource: "data", ofType: "json") {
let url = URL(fileURLWithPath: path)
do {
let data = try Data(contentsOf: url)
if let jsonArray = try JSONSerialization.jsonObject(with: data, options: .allowFragments) as? NSArray {
for (_, item) in jsonArray.enumerated() {
let itemDict = item as! NSDictionary
let id = itemDict["id"] as! Int
let name = itemDict["name"] as! String
let shower = itemDict["shower"] as! NSDictionary
let showerId = shower["id"] as! Int
let showerStatus = shower["status"] as! Int
let startLocation = shower["startLocation"] as! NSDictionary
let startLocationId = startLocation["id"] as! Int
let startLocationName = startLocation["name"] as! String
}
}
} catch {
print("Error: \(error.localizedDescription)")
}
}
this is what worked for me:
// Convert JSON to Array
func JSONToArray(_ json: String) -> Array<Any>? {
if let data = json.data(using: String.Encoding.utf8) {
do {
return try JSONSerialization.jsonObject(with: data, options: []) as? Array
} catch let error as NSError {
print(error)
}
}
return nil
}
After using this function i could loop trough the sub JSONs.
Thanks.