How can I decode two different response JSON in one request? - json

Question

I am trying to get response from Google's Book API. In there I can get response but for example, in some books have description or many other keys in response JSON. If I desing my structs according to with descriptions key, other books which not have description gave me dataCorrupted error and not decoding JSON. If I do otherwise, I get the same error on other books which have description. I hope I can explain myself. How can I solve it correctly?
Here my root class codable:
import Foundation
struct RootClass : Codable {
let items : [Item]?
let kind : String?
let totalItems : Int?
enum CodingKeys: String, CodingKey {
case items = "items"
case kind = "kind"
case totalItems = "totalItems"
}
init(from decoder: Decoder) throws {
let values = try decoder.container(keyedBy: CodingKeys.self)
items = try values.decodeIfPresent([Item].self, forKey: .items)
kind = try values.decodeIfPresent(String.self, forKey: .kind)
totalItems = try values.decodeIfPresent(Int.self, forKey: .totalItems)
}
}
I need to reach root -> items -> volumeInfo.
And here Item codable struct:
import Foundation
struct Item : Codable {
let accessInfo : AccessInfo?
let etag : String?
let id : String?
let kind : String?
let saleInfo : SaleInfo?
let searchInfo : SearchInfo?
let selfLink : String?
let volumeInfo : VolumeInfo?
enum CodingKeys: String, CodingKey {
case accessInfo = "accessInfo"
case etag = "etag"
case id = "id"
case kind = "kind"
case saleInfo = "saleInfo"
case searchInfo = "searchInfo"
case selfLink = "selfLink"
case volumeInfo = "volumeInfo"
}
init(from decoder: Decoder) throws {
let values = try decoder.container(keyedBy: CodingKeys.self)
accessInfo = try AccessInfo(from: decoder)
etag = try values.decodeIfPresent(String.self, forKey: .etag)
id = try values.decodeIfPresent(String.self, forKey: .id)
kind = try values.decodeIfPresent(String.self, forKey: .kind)
saleInfo = try SaleInfo(from: decoder)
searchInfo = try SearchInfo(from: decoder)
selfLink = try values.decodeIfPresent(String.self, forKey: .selfLink)
volumeInfo = try VolumeInfo(from: decoder)
}
}
And Here I parse json :
func parseJSON(searchData: Data) -> [SearchedModel]?{
let decode = JSONDecoder()
do{
let decodedData = try decode.decode(RootClass.self, from: searchData)
// IN HERE I CAN USE FOR LOOP TO ITEMS AND GET VOLUME INFO DATAS BUT ITS ALL NIL
return mainDataArr
}catch{
print(error)
return nil
}
}
When I try to loop over to items and get volume info datas its all nil. I can't understand why is this all nil? How can I solve it?
Here part of JSON 1 :
"kind": "books#volumes",
"totalItems": 1196,
"items": [
{
"kind": "books#volume",
"id": "4qnmsgEACAAJ",
"etag": "dYXW8bT6JB0",
"selfLink": "https://www.googleapis.com/books/v1/volumes/4qnmsgEACAAJ",
"volumeInfo": {
"title": "Sineklerin Tanrisi",
"authors": [
"William Golding"
],
"publishedDate": "2014-01-01",
"industryIdentifiers": [
{
"type": "ISBN_10",
"identifier": "9754582904"
},
{
"type": "ISBN_13",
"identifier": "9789754582901"
}
],
"readingModes": {
"text": false,
"image": false
},
"pageCount": 261,
"printType": "BOOK",
"categories": [
"Boys"
],
"maturityRating": "NOT_MATURE",
"allowAnonLogging": false,
"contentVersion": "preview-1.0.0",
"imageLinks": {
"smallThumbnail": "http://books.google.com/books/content?id=4qnmsgEACAAJ&printsec=frontcover&img=1&zoom=5&source=gbs_api",
"thumbnail": "http://books.google.com/books/content?id=4qnmsgEACAAJ&printsec=frontcover&img=1&zoom=1&source=gbs_api"
},
"language": "tr",
"previewLink": "http://books.google.com.tr/books?id=4qnmsgEACAAJ&dq=sineklerin+tanrisi&hl=&cd=1&source=gbs_api",
"infoLink": "http://books.google.com.tr/books?id=4qnmsgEACAAJ&dq=sineklerin+tanrisi&hl=&source=gbs_api",
"canonicalVolumeLink": "https://books.google.com/books/about/Sineklerin_Tanrisi.html?hl=&id=4qnmsgEACAAJ"
},
"saleInfo": {
"country": "TR",
"saleability": "NOT_FOR_SALE",
"isEbook": false
},
"accessInfo": {
"country": "TR",
"viewability": "NO_PAGES",
"embeddable": false,
"publicDomain": false,
"textToSpeechPermission": "ALLOWED",
"epub": {
"isAvailable": false
},
"pdf": {
"isAvailable": false
},
"webReaderLink": "http://play.google.com/books/reader?id=4qnmsgEACAAJ&hl=&printsec=frontcover&source=gbs_api",
"accessViewStatus": "NONE",
"quoteSharingAllowed": false
}
}
And here JSON 2 (with same request's response):
"kind": "books#volumes",
"totalItems": 432,
"items": [
{
"kind": "books#volume",
"id": "yodWha1LmPsC",
"etag": "2bZz2CDqiq4",
"selfLink": "https://www.googleapis.com/books/v1/volumes/yodWha1LmPsC",
"volumeInfo": {
"title": "Momo the Monkey Arrives",
"authors": [
"Shariffa Keshavjee"
],
"publisher": "Master Publishing",
"publishedDate": "2012-09-21",
"description": "Momo the Monkey Arrives is the first in a series of illustrated children's books about the rescue of a monkey and how his presence livens up the household of two children: a boy and a girl. Along the way, as they take care of Momo, Geno and Alid learn how to give the best possible care to a monkey like him, and how to be more responsible children. The adventures of Momo are based on a true story.",
"industryIdentifiers": [
{
"type": "ISBN_13",
"identifier": "9789966158987"
},
{
"type": "ISBN_10",
"identifier": "9966158987"
}
],
"readingModes": {
"text": true,
"image": true
},
"pageCount": 28,
"printType": "BOOK",
"categories": [
"Juvenile Fiction"
],
"maturityRating": "NOT_MATURE",
"allowAnonLogging": false,
"contentVersion": "1.4.4.0.preview.3",
"panelizationSummary": {
"containsEpubBubbles": false,
"containsImageBubbles": false
},
"imageLinks": {
"smallThumbnail": "http://books.google.com/books/content?id=yodWha1LmPsC&printsec=frontcover&img=1&zoom=5&edge=curl&source=gbs_api",
"thumbnail": "http://books.google.com/books/content?id=yodWha1LmPsC&printsec=frontcover&img=1&zoom=1&edge=curl&source=gbs_api"
},
"language": "en",
"previewLink": "http://books.google.com.tr/books?id=yodWha1LmPsC&pg=PT25&dq=momo&hl=&cd=1&source=gbs_api",
"infoLink": "https://play.google.com/store/books/details?id=yodWha1LmPsC&source=gbs_api",
"canonicalVolumeLink": "https://play.google.com/store/books/details?id=yodWha1LmPsC"
},
"saleInfo": {
"country": "TR",
"saleability": "FOR_SALE",
"isEbook": true,
"listPrice": {
"amount": 35.04,
"currencyCode": "TRY"
},
"retailPrice": {
"amount": 35.04,
"currencyCode": "TRY"
},
"buyLink": "https://play.google.com/store/books/details?id=yodWha1LmPsC&rdid=book-yodWha1LmPsC&rdot=1&source=gbs_api",
"offers": [
{
"finskyOfferType": 1,
"listPrice": {
"amountInMicros": 35040000,
"currencyCode": "TRY"
},
"retailPrice": {
"amountInMicros": 35040000,
"currencyCode": "TRY"
}
}
]
},
"accessInfo": {
"country": "TR",
"viewability": "PARTIAL",
"embeddable": true,
"publicDomain": false,
"textToSpeechPermission": "ALLOWED",
"epub": {
"isAvailable": true
},
"pdf": {
"isAvailable": true
},
"webReaderLink": "http://play.google.com/books/reader?id=yodWha1LmPsC&hl=&printsec=frontcover&source=gbs_api",
"accessViewStatus": "SAMPLE",
"quoteSharingAllowed": false
},
"searchInfo": {
"textSnippet": "<b>Momo</b> the Monkey Adventure Series <b>Momo</b> the Monkey Arrives <b>Momo</b> Makes a <br>\nMess <b>Momo</b> Comes to the Rescue <b>Momo</b> Moves to the Orphanage Look out for <br>\nthese stories about <b>Momo</b> and his friends. More coming soon! Master Publishing<br>\n ..."
}
}

Answer 1

The "data corrupted" error seems to be due to the presence of the \n in the textSnippet. If we take care of that manually, I can't reproduce any issue. Here is a complete (unlike your code) example that compiles and runs correctly in an iOS project, using the JSON you provided (patched up to be valid JSON):
let json1 = """
{
"kind": "books#volumes",
"totalItems": 1196,
"items": [
{
"kind": "books#volume",
"id": "4qnmsgEACAAJ",
"etag": "dYXW8bT6JB0",
"selfLink": "https://www.googleapis.com/books/v1/volumes/4qnmsgEACAAJ",
"volumeInfo": {
"title": "Sineklerin Tanrisi",
"authors": [
"William Golding"
],
"publishedDate": "2014-01-01",
"industryIdentifiers": [
{
"type": "ISBN_10",
"identifier": "9754582904"
},
{
"type": "ISBN_13",
"identifier": "9789754582901"
}
],
"readingModes": {
"text": false,
"image": false
},
"pageCount": 261,
"printType": "BOOK",
"categories": [
"Boys"
],
"maturityRating": "NOT_MATURE",
"allowAnonLogging": false,
"contentVersion": "preview-1.0.0",
"imageLinks": {
"smallThumbnail": "http://books.google.com/books/content?id=4qnmsgEACAAJ&printsec=frontcover&img=1&zoom=5&source=gbs_api",
"thumbnail": "http://books.google.com/books/content?id=4qnmsgEACAAJ&printsec=frontcover&img=1&zoom=1&source=gbs_api"
},
"language": "tr",
"previewLink": "http://books.google.com.tr/books?id=4qnmsgEACAAJ&dq=sineklerin+tanrisi&hl=&cd=1&source=gbs_api",
"infoLink": "http://books.google.com.tr/books?id=4qnmsgEACAAJ&dq=sineklerin+tanrisi&hl=&source=gbs_api",
"canonicalVolumeLink": "https://books.google.com/books/about/Sineklerin_Tanrisi.html?hl=&id=4qnmsgEACAAJ"
},
"saleInfo": {
"country": "TR",
"saleability": "NOT_FOR_SALE",
"isEbook": false
},
"accessInfo": {
"country": "TR",
"viewability": "NO_PAGES",
"embeddable": false,
"publicDomain": false,
"textToSpeechPermission": "ALLOWED",
"epub": {
"isAvailable": false
},
"pdf": {
"isAvailable": false
},
"webReaderLink": "http://play.google.com/books/reader?id=4qnmsgEACAAJ&hl=&printsec=frontcover&source=gbs_api",
"accessViewStatus": "NONE",
"quoteSharingAllowed": false
}
}
]
}
"""
let json2 = """
{
"kind": "books#volumes",
"totalItems": 432,
"items": [
{
"kind": "books#volume",
"id": "yodWha1LmPsC",
"etag": "2bZz2CDqiq4",
"selfLink": "https://www.googleapis.com/books/v1/volumes/yodWha1LmPsC",
"volumeInfo": {
"title": "Momo the Monkey Arrives",
"authors": [
"Shariffa Keshavjee"
],
"publisher": "Master Publishing",
"publishedDate": "2012-09-21",
"description": "Momo the Monkey Arrives is the first in a series of illustrated children's books about the rescue of a monkey and how his presence livens up the household of two children: a boy and a girl. Along the way, as they take care of Momo, Geno and Alid learn how to give the best possible care to a monkey like him, and how to be more responsible children. The adventures of Momo are based on a true story.",
"industryIdentifiers": [
{
"type": "ISBN_13",
"identifier": "9789966158987"
},
{
"type": "ISBN_10",
"identifier": "9966158987"
}
],
"readingModes": {
"text": true,
"image": true
},
"pageCount": 28,
"printType": "BOOK",
"categories": [
"Juvenile Fiction"
],
"maturityRating": "NOT_MATURE",
"allowAnonLogging": false,
"contentVersion": "1.4.4.0.preview.3",
"panelizationSummary": {
"containsEpubBubbles": false,
"containsImageBubbles": false
},
"imageLinks": {
"smallThumbnail": "http://books.google.com/books/content?id=yodWha1LmPsC&printsec=frontcover&img=1&zoom=5&edge=curl&source=gbs_api",
"thumbnail": "http://books.google.com/books/content?id=yodWha1LmPsC&printsec=frontcover&img=1&zoom=1&edge=curl&source=gbs_api"
},
"language": "en",
"previewLink": "http://books.google.com.tr/books?id=yodWha1LmPsC&pg=PT25&dq=momo&hl=&cd=1&source=gbs_api",
"infoLink": "https://play.google.com/store/books/details?id=yodWha1LmPsC&source=gbs_api",
"canonicalVolumeLink": "https://play.google.com/store/books/details?id=yodWha1LmPsC"
},
"saleInfo": {
"country": "TR",
"saleability": "FOR_SALE",
"isEbook": true,
"listPrice": {
"amount": 35.04,
"currencyCode": "TRY"
},
"retailPrice": {
"amount": 35.04,
"currencyCode": "TRY"
},
"buyLink": "https://play.google.com/store/books/details?id=yodWha1LmPsC&rdid=book-yodWha1LmPsC&rdot=1&source=gbs_api",
"offers": [
{
"finskyOfferType": 1,
"listPrice": {
"amountInMicros": 35040000,
"currencyCode": "TRY"
},
"retailPrice": {
"amountInMicros": 35040000,
"currencyCode": "TRY"
}
}
]
},
"accessInfo": {
"country": "TR",
"viewability": "PARTIAL",
"embeddable": true,
"publicDomain": false,
"textToSpeechPermission": "ALLOWED",
"epub": {
"isAvailable": true
},
"pdf": {
"isAvailable": true
},
"webReaderLink": "http://play.google.com/books/reader?id=yodWha1LmPsC&hl=&printsec=frontcover&source=gbs_api",
"accessViewStatus": "SAMPLE",
"quoteSharingAllowed": false
},
"searchInfo": {
"textSnippet": "<b>Momo</b> the Monkey Adventure Series <b>Momo</b> the Monkey Arrives <b>Momo</b> Makes a <br>\\nMess <b>Momo</b> Comes to the Rescue <b>Momo</b> Moves to the Orphanage Look out for <br>\\nthese stories about <b>Momo</b> and his friends. More coming soon! Master Publishing<br>\\n ..."
}
}
]
}
"""
struct Base : Codable {
let kind : String
let totalItems : Int
let items : [Items]
}
struct Items : Codable {
let kind : String
let id : String
let etag : String
let selfLink : String
let volumeInfo : VolumeInfo
let saleInfo : SaleInfo?
let accessInfo : AccessInfo
let searchInfo : SearchInfo?
}
struct SaleInfo : Codable {
let country : String
let saleability : String
let isEbook : Bool
let listPrice : ListPrice?
let retailPrice : RetailPrice?
let buyLink : String?
let offers : [Offers]?
}
struct Offers : Codable {
let finskyOfferType : Int
let listPrice : ListPrice
let retailPrice : RetailPrice
}
struct ListPrice : Codable {
let amountInMicros : Int?
let currencyCode : String
}
struct ReadingModes : Codable {
let text : Bool
let image : Bool
}
struct Epub : Codable {
let isAvailable : Bool
}
struct Pdf : Codable {
let isAvailable : Bool
}
struct RetailPrice : Codable {
let amountInMicros : Int?
let currencyCode : String
}
struct SearchInfo : Codable {
let textSnippet : String
}
struct ImageLinks : Codable {
let smallThumbnail : String
let thumbnail : String
}
struct IndustryIdentifiers : Codable {
let type : String
let identifier : String
}
struct PanelizationSummary : Codable {
let containsEpubBubbles : Bool
let containsImageBubbles : Bool
}
struct VolumeInfo : Codable {
let title : String
let authors : [String]
let publisher : String?
let publishedDate : String
let description : String?
let industryIdentifiers : [IndustryIdentifiers]
let readingModes : ReadingModes
let pageCount : Int
let printType : String
let categories : [String]
let maturityRating : String
let allowAnonLogging : Bool
let contentVersion : String
let panelizationSummary : PanelizationSummary?
let imageLinks : ImageLinks
let language : String
let previewLink : String
let infoLink : String
let canonicalVolumeLink : String
}
struct AccessInfo : Codable {
let country : String
let viewability : String
let embeddable : Bool
let publicDomain : Bool
let textToSpeechPermission : String
let epub : Epub
let pdf : Pdf
let webReaderLink : String
let accessViewStatus : String
let quoteSharingAllowed : Bool
}
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let data1 = json1.data(using: .utf8)!
do {
let result = try JSONDecoder().decode(Base.self, from: data1)
print("success1")
print(result)
} catch {
print(error)
}
let data2 = json2.data(using: .utf8)!
do {
let result = try JSONDecoder().decode(Base.self, from: data2)
print("success2")
print(result)
} catch {
print(error)
}
}
}