GitHub API not parsing - ios

Question

This is a part of the JSON i am getting from Github in response to a request
{
"total_count": 1657,
"incomplete_results": false,
"items": [
{
"id": 68911683,
"node_id": "MDEwOlJlcG9zaXRvcnk2ODkxMTY4Mw==",
"name": "tetros",
"full_name": "daniel-e/tetros",
"private": false,
"html_url": "https://github.com/daniel-e/tetros",
"description": "Tetris that fits into the boot sector.",
"size": 171,
"stargazers_count": 677,
"watchers_count": 677,
"language": "Assembly",
}
]
}
This is my Model
struct RepoGroup:Codable {
var items:[Repo]
}
struct Repo: Codable {
var fullName:String
var stars:Int
var watchers:Int
init(url:String,star:Int,watcher:Int) {
fullName = url
stars = star
watchers = watcher
}
enum MyStructKeys: String, CodingKey {
case fullName = "full_name"
case stars = "stargazers_count"
case watchers = "watchers_count"
}
init(from decoder: Decoder) throws {
let container = try decoder.container(keyedBy: MyStructKeys.self)
let fullName: String = try container.decode(String.self, forKey: .fullName)
let stars: Int = try container.decode(Int.self, forKey: .stars)
let watchers: Int = try container.decode(Int.self, forKey: .watchers)
self.init(url: fullName, star: stars, watcher: watchers)
}
}
So far so good. But as soon as i add description:String field in my model, the JSON decoder inexplicably fails to parse.
Here is my parser
let model = try JSONDecoder().decode(RepoGroup.self, from: dataResponse)
I am struggling to understand what is so special about the description field. Any kind of help would be greatly appreciated. Thanks.

Answer 1

Description appears to be an optional field in the GitHub API, and when a repo doesn't define a description, it is coming back as a null. This means you need to make your description field a String? and switch to using decodeIfPresent to account for the fact that it is optional.

Answer 2

Nothing seems off about that particular JSON to not work for description. Haven't tested this, but this is what your code looks like?
struct RepoGroup:Codable {
var items:[Repo]
}
struct Repo: Codable {
var fullName:String
var stars:Int
var watchers:Int
var description:String
init(url:String,star:Int,watcher:Int,description:String) {
fullName = url
stars = star
watchers = watcher
description = description
}
enum MyStructKeys: String, CodingKey {
case fullName = "full_name"
case stars = "stargazers_count"
case watchers = "watchers_count"
case description = "description"
}
init(from decoder: Decoder) throws {
let container = try decoder.container(keyedBy: MyStructKeys.self)
let fullName: String = try container.decode(String.self, forKey: .fullName)
let stars: Int = try container.decode(Int.self, forKey: .stars)
let watchers: Int = try container.decode(Int.self, forKey: .watchers)
let description: String = try container.decode(String.self, forKey: .description)
self.init(url: fullName, star: stars, watcher: watchers, description: description)
}
}