how can I get tweet with JSONDecoder - ios

Question

I used Json4Swift web site.
Root Model:
struct Json4Swift_Base : Codable {
let trends : [Trends]?
let as_of : String?
let created_at : String?
let locations : [Locations]?
enum CodingKeys: String, CodingKey {
case trends = "trends"
case as_of = "as_of"
case created_at = "created_at"
case locations = "locations"
}
init(from decoder: Decoder) throws {
let values = try decoder.container(keyedBy: CodingKeys.self)
trends = try values.decodeIfPresent([Trends].self, forKey: .trends)
as_of = try values.decodeIfPresent(String.self, forKey: .as_of)
created_at = try values.decodeIfPresent(String.self, forKey: .created_at)
locations = try values.decodeIfPresent([Locations].self, forKey: .locations)
}
}
Location Model:
struct Locations : Codable {
let name : String?
let woeid : Int?
enum CodingKeys: String, CodingKey {
case name = "name"
case woeid = "woeid"
}
init(from decoder: Decoder) throws {
let values = try decoder.container(keyedBy: CodingKeys.self)
name = try values.decodeIfPresent(String.self, forKey: .name)
woeid = try values.decodeIfPresent(Int.self, forKey: .woeid)
}
}
Trend Model:
struct Trends : Codable {
let name : String?
let url : String?
let promoted_content : String?
let query : String?
let tweet_volume : Int?
enum CodingKeys: String, CodingKey {
case name = "name"
case url = "url"
case promoted_content = "promoted_content"
case query = "query"
case tweet_volume = "tweet_volume"
}
init(from decoder: Decoder) throws {
let values = try decoder.container(keyedBy: CodingKeys.self)
name = try values.decodeIfPresent(String.self, forKey: .name)
url = try values.decodeIfPresent(String.self, forKey: .url)
promoted_content = try values.decodeIfPresent(String.self, forKey: .promoted_content)
query = try values.decodeIfPresent(String.self, forKey: .query)
tweet_volume = try values.decodeIfPresent(Int.self, forKey: .tweet_volume)
}
}
Twitter Request Code:
let request = client.urlRequest(withMethod: "GET", urlString: statusesShowEndpoint, parameters: params, error: &clientError)
client.sendTwitterRequest(request) { (response, data, connectionError) -> Void in
if connectionError != nil {
print("Error: \(String(describing: connectionError))")
}
do {
// let json = try JSONSerialization.jsonObject(with: data!, options: [])
// print(json)
// -> How do I get the data without using this code.
let rssFeed = try JSONDecoder().decode(Json4Swift_Base.self, from: data!)
self.trends = rssFeed.trends!
} catch let jsonError as NSError {
print("json error: \(jsonError.localizedDescription)")
}
}
print("Trend: \(trends)")
}
}
How can I get Tweet with JSONDecoder().decode()
how do I get the data without using this code. JSONSerialization.jsonObject()
I get an error when I use this code.
let rssFeed = try JSONDecoder().decode(Json4Swift_Base.self, from: data!)
Twitter Api is here: https://developer.twitter.com/en/docs/trends/trends-for-location/api-reference/get-trends-place
How can I decode JSON Data. Sorry for my English. I know little English.

Answer 1

JSON
So this is your JSON
let data = """
[
{
"trends": [
{
"name": "#ChainedToTheRhythm",
"url": "http://twitter.com/search?q=%23ChainedToTheRhythm",
"promoted_content": null,
"query": "%23ChainedToTheRhythm",
"tweet_volume": 48857
},
{
"name": "#اليوم_العالمي_للعتبان",
"url": "http://twitter.com/search?q=%23%D8%A7%D9%84%D9%8A%D9%88%D9%85_%D8%A7%D9%84%D8%B9%D8%A7%D9%84%D9%85%D9%8A_%D9%84%D9%84%D8%B9%D8%AA%D8%A8%D8%A7%D9%86",
"promoted_content": null,
"query": "%23%D8%A7%D9%84%D9%8A%D9%88%D9%85_%D8%A7%D9%84%D8%B9%D8%A7%D9%84%D9%85%D9%8A_%D9%84%D9%84%D8%B9%D8%AA%D8%A8%D8%A7%D9%86",
"tweet_volume": null
},
{
"name": "George Lopez",
"url": "http://twitter.com/search?q=%22George+Lopez%22",
"promoted_content": null,
"query": "%22George+Lopez%22",
"tweet_volume": 90590
},
{
"name": "#قل_كلمه_للي_يتابعك",
"url": "http://twitter.com/search?q=%23%D9%82%D9%84_%D9%83%D9%84%D9%85%D9%87_%D9%84%D9%84%D9%8A_%D9%8A%D8%AA%D8%A7%D8%A8%D8%B9%D9%83",
"promoted_content": null,
"query": "%23%D9%82%D9%84_%D9%83%D9%84%D9%85%D9%87_%D9%84%D9%84%D9%8A_%D9%8A%D8%AA%D8%A7%D8%A8%D8%B9%D9%83",
"tweet_volume": null
},
{
"name": "#FelizMiercoles",
"url": "http://twitter.com/search?q=%23FelizMiercoles",
"promoted_content": null,
"query": "%23FelizMiercoles",
"tweet_volume": 36103
},
{
"name": "#wednesdaywisdom",
"url": "http://twitter.com/search?q=%23wednesdaywisdom",
"promoted_content": null,
"query": "%23wednesdaywisdom",
"tweet_volume": 42916
},
{
"name": "Tara Palmer-Tomkinson",
"url": "http://twitter.com/search?q=%22Tara+Palmer-Tomkinson%22",
"promoted_content": null,
"query": "%22Tara+Palmer-Tomkinson%22",
"tweet_volume": null
},
{
"name": "呪いチョコ",
"url": "http://twitter.com/search?q=%E5%91%AA%E3%81%84%E3%83%81%E3%83%A7%E3%82%B3",
"promoted_content": null,
"query": "%E5%91%AA%E3%81%84%E3%83%81%E3%83%A7%E3%82%B3",
"tweet_volume": 15704
},
{
"name": "メンテ",
"url": "http://twitter.com/search?q=%E3%83%A1%E3%83%B3%E3%83%86",
"promoted_content": null,
"query": "%E3%83%A1%E3%83%B3%E3%83%86",
"tweet_volume": 344416
},
{
"name": "SLAY CAMILIZERS",
"url": "http://twitter.com/search?q=%22SLAY+CAMILIZERS%22",
"promoted_content": null,
"query": "%22SLAY+CAMILIZERS%22",
"tweet_volume": 707166
},
{
"name": "あなたの精神年齢",
"url": "http://twitter.com/search?q=%E3%81%82%E3%81%AA%E3%81%9F%E3%81%AE%E7%B2%BE%E7%A5%9E%E5%B9%B4%E9%BD%A2",
"promoted_content": null,
"query": "%E3%81%82%E3%81%AA%E3%81%9F%E3%81%AE%E7%B2%BE%E7%A5%9E%E5%B9%B4%E9%BD%A2",
"tweet_volume": null
},
{
"name": "WORK FROM 5H",
"url": "http://twitter.com/search?q=%22WORK+FROM+5H%22",
"promoted_content": null,
"query": "%22WORK+FROM+5H%22",
"tweet_volume": 54061
},
{
"name": "Leyla Zana",
"url": "http://twitter.com/search?q=%22Leyla+Zana%22",
"promoted_content": null,
"query": "%22Leyla+Zana%22",
"tweet_volume": null
},
{
"name": "#TwoJustin",
"url": "http://twitter.com/search?q=%23TwoJustin",
"promoted_content": null,
"query": "%23TwoJustin",
"tweet_volume": null
},
{
"name": "#MyFirstAndLast",
"url": "http://twitter.com/search?q=%23MyFirstAndLast",
"promoted_content": null,
"query": "%23MyFirstAndLast",
"tweet_volume": 63844
},
{
"name": "#ValentinesDayIn3Words",
"url": "http://twitter.com/search?q=%23ValentinesDayIn3Words",
"promoted_content": null,
"query": "%23ValentinesDayIn3Words",
"tweet_volume": null
},
{
"name": "#ShePersisted",
"url": "http://twitter.com/search?q=%23ShePersisted",
"promoted_content": null,
"query": "%23ShePersisted",
"tweet_volume": 45624
},
{
"name": "#HappyJohnnyDay",
"url": "http://twitter.com/search?q=%23HappyJohnnyDay",
"promoted_content": null,
"query": "%23HappyJohnnyDay",
"tweet_volume": 28560
},
{
"name": "#QuartaDetremuraSDV",
"url": "http://twitter.com/search?q=%23QuartaDetremuraSDV",
"promoted_content": null,
"query": "%23QuartaDetremuraSDV",
"tweet_volume": 10481
},
{
"name": "#ترحيل_الاجانب_مطلب_وطني",
"url": "http://twitter.com/search?q=%23%D8%AA%D8%B1%D8%AD%D9%8A%D9%84_%D8%A7%D9%84%D8%A7%D8%AC%D8%A7%D9%86%D8%A8_%D9%85%D8%B7%D9%84%D8%A8_%D9%88%D8%B7%D9%86%D9%8A",
"promoted_content": null,
"query": "%23%D8%AA%D8%B1%D8%AD%D9%8A%D9%84_%D8%A7%D9%84%D8%A7%D8%AC%D8%A7%D9%86%D8%A8_%D9%85%D8%B7%D9%84%D8%A8_%D9%88%D8%B7%D9%86%D9%8A",
"tweet_volume": null
},
{
"name": "#TapperDirtFile",
"url": "http://twitter.com/search?q=%23TapperDirtFile",
"promoted_content": null,
"query": "%23TapperDirtFile",
"tweet_volume": null
},
{
"name": "#FelizCumplePresidente",
"url": "http://twitter.com/search?q=%23FelizCumplePresidente",
"promoted_content": null,
"query": "%23FelizCumplePresidente",
"tweet_volume": 15276
},
{
"name": "#MeCasoSiMeDices",
"url": "http://twitter.com/search?q=%23MeCasoSiMeDices",
"promoted_content": null,
"query": "%23MeCasoSiMeDices",
"tweet_volume": null
},
{
"name": "#FebreroZamorista",
"url": "http://twitter.com/search?q=%23FebreroZamorista",
"promoted_content": null,
"query": "%23FebreroZamorista",
"tweet_volume": null
},
{
"name": "#NãoSuportoQuando",
"url": "http://twitter.com/search?q=%23N%C3%A3oSuportoQuando",
"promoted_content": null,
"query": "%23N%C3%A3oSuportoQuando",
"tweet_volume": 14327
},
{
"name": "#NinguemSabeMasEuJa",
"url": "http://twitter.com/search?q=%23NinguemSabeMasEuJa",
"promoted_content": null,
"query": "%23NinguemSabeMasEuJa",
"tweet_volume": 12856
},
{
"name": "#وش_شعورك_اول_يوم_دوام",
"url": "http://twitter.com/search?q=%23%D9%88%D8%B4_%D8%B4%D8%B9%D9%88%D8%B1%D9%83_%D8%A7%D9%88%D9%84_%D9%8A%D9%88%D9%85_%D8%AF%D9%88%D8%A7%D9%85",
"promoted_content": null,
"query": "%23%D9%88%D8%B4_%D8%B4%D8%B9%D9%88%D8%B1%D9%83_%D8%A7%D9%88%D9%84_%D9%8A%D9%88%D9%85_%D8%AF%D9%88%D8%A7%D9%85",
"tweet_volume": null
},
{
"name": "#HappyChunghaDay",
"url": "http://twitter.com/search?q=%23HappyChunghaDay",
"promoted_content": null,
"query": "%23HappyChunghaDay",
"tweet_volume": 16480
},
{
"name": "#DiaDeLaPiscola",
"url": "http://twitter.com/search?q=%23DiaDeLaPiscola",
"promoted_content": null,
"query": "%23DiaDeLaPiscola",
"tweet_volume": null
},
{
"name": "#زواج_الامير_بدر_بن_عبدالله",
"url": "http://twitter.com/search?q=%23%D8%B2%D9%88%D8%A7%D8%AC_%D8%A7%D9%84%D8%A7%D9%85%D9%8A%D8%B1_%D8%A8%D8%AF%D8%B1_%D8%A8%D9%86_%D8%B9%D8%A8%D8%AF%D8%A7%D9%84%D9%84%D9%87",
"promoted_content": null,
"query": "%23%D8%B2%D9%88%D8%A7%D8%AC_%D8%A7%D9%84%D8%A7%D9%85%D9%8A%D8%B1_%D8%A8%D8%AF%D8%B1_%D8%A8%D9%86_%D8%B9%D8%A8%D8%AF%D8%A7%D9%84%D9%84%D9%87",
"tweet_volume": null
},
{
"name": "#UnBuenTaco",
"url": "http://twitter.com/search?q=%23UnBuenTaco",
"promoted_content": null,
"query": "%23UnBuenTaco",
"tweet_volume": null
},
{
"name": "#PMQs",
"url": "http://twitter.com/search?q=%23PMQs",
"promoted_content": null,
"query": "%23PMQs",
"tweet_volume": 20406
},
{
"name": "#InteractFalando",
"url": "http://twitter.com/search?q=%23InteractFalando",
"promoted_content": null,
"query": "%23InteractFalando",
"tweet_volume": null
},
{
"name": "#ナカイの窓",
"url": "http://twitter.com/search?q=%23%E3%83%8A%E3%82%AB%E3%82%A4%E3%81%AE%E7%AA%93",
"promoted_content": null,
"query": "%23%E3%83%8A%E3%82%AB%E3%82%A4%E3%81%AE%E7%AA%93",
"tweet_volume": 14835
},
{
"name": "#حزب_اللي_ما_يحبون_دانكن",
"url": "http://twitter.com/search?q=%23%D8%AD%D8%B2%D8%A8_%D8%A7%D9%84%D9%84%D9%8A_%D9%85%D8%A7_%D9%8A%D8%AD%D8%A8%D9%88%D9%86_%D8%AF%D8%A7%D9%86%D9%83%D9%86",
"promoted_content": null,
"query": "%23%D8%AD%D8%B2%D8%A8_%D8%A7%D9%84%D9%84%D9%8A_%D9%85%D8%A7_%D9%8A%D8%AD%D8%A8%D9%88%D9%86_%D8%AF%D8%A7%D9%86%D9%83%D9%86",
"tweet_volume": 18170
},
{
"name": "#LIZAonTWBA",
"url": "http://twitter.com/search?q=%23LIZAonTWBA",
"promoted_content": null,
"query": "%23LIZAonTWBA",
"tweet_volume": 68066
},
{
"name": "#nldebat",
"url": "http://twitter.com/search?q=%23nldebat",
"promoted_content": null,
"query": "%23nldebat",
"tweet_volume": null
},
{
"name": "#ConselhosDeUmTrouxa",
"url": "http://twitter.com/search?q=%23ConselhosDeUmTrouxa",
"promoted_content": null,
"query": "%23ConselhosDeUmTrouxa",
"tweet_volume": 11419
},
{
"name": "#PBBKiligOverload",
"url": "http://twitter.com/search?q=%23PBBKiligOverload",
"promoted_content": null,
"query": "%23PBBKiligOverload",
"tweet_volume": 70766
},
{
"name": "#MiMejorPiropoParaTi",
"url": "http://twitter.com/search?q=%23MiMejorPiropoParaTi",
"promoted_content": null,
"query": "%23MiMejorPiropoParaTi",
"tweet_volume": null
},
{
"name": "#8Feb",
"url": "http://twitter.com/search?q=%238Feb",
"promoted_content": null,
"query": "%238Feb",
"tweet_volume": null
},
{
"name": "#عوده_منصور_البلوي",
"url": "http://twitter.com/search?q=%23%D8%B9%D9%88%D8%AF%D9%87_%D9%85%D9%86%D8%B5%D9%88%D8%B1_%D8%A7%D9%84%D8%A8%D9%84%D9%88%D9%8A",
"promoted_content": null,
"query": "%23%D8%B9%D9%88%D8%AF%D9%87_%D9%85%D9%86%D8%B5%D9%88%D8%B1_%D8%A7%D9%84%D8%A8%D9%84%D9%88%D9%8A",
"tweet_volume": null
},
{
"name": "#LoveBeyondFlags",
"url": "http://twitter.com/search?q=%23LoveBeyondFlags",
"promoted_content": null,
"query": "%23LoveBeyondFlags",
"tweet_volume": null
},
{
"name": "#EscándaloOdebrecht",
"url": "http://twitter.com/search?q=%23Esc%C3%A1ndaloOdebrecht",
"promoted_content": null,
"query": "%23Esc%C3%A1ndaloOdebrecht",
"tweet_volume": null
},
{
"name": "#PregúntaleAPedro",
"url": "http://twitter.com/search?q=%23Preg%C3%BAntaleAPedro",
"promoted_content": null,
"query": "%23Preg%C3%BAntaleAPedro",
"tweet_volume": null
},
{
"name": "#بذاءه_مصري_في_كريم",
"url": "http://twitter.com/search?q=%23%D8%A8%D8%B0%D8%A7%D8%A1%D9%87_%D9%85%D8%B5%D8%B1%D9%8A_%D9%81%D9%8A_%D9%83%D8%B1%D9%8A%D9%85",
"promoted_content": null,
"query": "%23%D8%A8%D8%B0%D8%A7%D8%A1%D9%87_%D9%85%D8%B5%D8%B1%D9%8A_%D9%81%D9%8A_%D9%83%D8%B1%D9%8A%D9%85",
"tweet_volume": 38019
},
{
"name": "#MSWL",
"url": "http://twitter.com/search?q=%23MSWL",
"promoted_content": null,
"query": "%23MSWL",
"tweet_volume": null
},
{
"name": "#WhatsappÇöktü",
"url": "http://twitter.com/search?q=%23Whatsapp%C3%87%C3%B6kt%C3%BC",
"promoted_content": null,
"query": "%23Whatsapp%C3%87%C3%B6kt%C3%BC",
"tweet_volume": null
},
{
"name": "#SoMeArrependoDe",
"url": "http://twitter.com/search?q=%23SoMeArrependoDe",
"promoted_content": null,
"query": "%23SoMeArrependoDe",
"tweet_volume": null
},
{
"name": "#حزب_العاطلين_بتويتر",
"url": "http://twitter.com/search?q=%23%D8%AD%D8%B2%D8%A8_%D8%A7%D9%84%D8%B9%D8%A7%D8%B7%D9%84%D9%8A%D9%86_%D8%A8%D8%AA%D9%88%D9%8A%D8%AA%D8%B1",
"promoted_content": null,
"query": "%23%D8%AD%D8%B2%D8%A8_%D8%A7%D9%84%D8%B9%D8%A7%D8%B7%D9%84%D9%8A%D9%86_%D8%A8%D8%AA%D9%88%D9%8A%D8%AA%D8%B1",
"tweet_volume": null
}
],
"as_of": "2017-02-08T16:18:18Z",
"created_at": "2017-02-08T16:10:33Z",
"locations": [
{
"name": "Worldwide",
"woeid": 1
}
]
}
]
""".data(using: .utf8)!
Model
Now you can simplify your model
struct Location: Codable {
let name: String?
let woeid: Int?
}
struct Trend: Codable {
let name: String?
let url: URL?
let promotedContent: String?
let query: String?
let tweetVolume: Int?
}
struct Element: Codable {
let trends: [Trend]?
let asOf: String?
let createdAt: String?
let locations: [Location]?
}
Decoding from snake_case_notation
Next you can created your JSONDecoder() and properly set the key decoding strategy.
let jsonDecoder = JSONDecoder()
jsonDecoder.keyDecodingStrategy = .convertFromSnakeCase
Decoding!!
And finally remember that your JSON is an array of elements, so during the decoding use [Element].self instead if Element.self.
do {
let response = try JSONDecoder().decode([Element].self, from: data)
print(response)
} catch {
print(error)
}
That's it.
UPDATE
About your comment
How can get trends from Elements array ?
This is how you access the Trend values.
do {
let response = try JSONDecoder().decode([Element].self, from: data)
for element in response {
for trend in element.trends ?? [] {
print(trend)
}
}
} catch {
print(error)
}
You can also save all the Trend(s) into a single array
let allTrends = response.compactMap { $0.trends }.flatMap { $0 }
print(allTrends)