You can write a custom struct that functions as a CodingKeys object, and initialize it with a string such that it extracts the key you specified:
private struct CK : CodingKey {
var stringValue: String
init?(stringValue: String) {
self.stringValue = stringValue
}
var intValue: Int?
init?(intValue: Int) {
return nil
}
}
Thus, once you know what the desired key is, you can say (in the init(from:) override:
let key = // whatever the key name turns out to be
let con2 = try! decoder.container(keyedBy: CK.self)
self.unknown = try! con2.decode([Inner].self, forKey: CK(stringValue:key)!)
So what I ended up doing is making two containers from the decoder — one using the standard CodingKeys enum to extract the value of the "categoryName" key, and another using the CK struct to extract the value of the key whose name we just learned:
init(from decoder: Decoder) throws {
let con = try! decoder.container(keyedBy: CodingKeys.self)
self.categoryName = try! con.decode(String.self, forKey:.categoryName)
let key = self.categoryName
let con2 = try! decoder.container(keyedBy: CK.self)
self.unknown = try! con2.decode([Inner].self, forKey: CK(stringValue:key)!)
}
Here, then, is my entire Decodable struct:
struct ResponseData : Codable {
let categoryName : String
let unknown : [Inner]
struct Inner : Codable {
let category : String
let trailerPrice : String
let isFavourit : String?
let isWatchList : String?
}
private enum CodingKeys : String, CodingKey {
case categoryName
}
private struct CK : CodingKey {
var stringValue: String
init?(stringValue: String) {
self.stringValue = stringValue
}
var intValue: Int?
init?(intValue: Int) {
return nil
}
}
init(from decoder: Decoder) throws {
let con = try! decoder.container(keyedBy: CodingKeys.self)
self.categoryName = try! con.decode(String.self, forKey:.categoryName)
let key = self.categoryName
let con2 = try! decoder.container(keyedBy: CK.self)
self.unknown = try! con2.decode([Inner].self, forKey: CK(stringValue:key)!)
}
}
And here's the test bed:
let json = """
[
{
"categoryName": "Trending",
"Trending": [
{
"category": "Trending",
"trailerPrice": "",
"isFavourit": null,
"isWatchlist": null
}
]
},
{
"categoryName": "Comedy",
"Comedy": [
{
"category": "Comedy",
"trailerPrice": "",
"isFavourit": null,
"isWatchlist": null
}
]
}
]
"""
let myjson = try! JSONDecoder().decode(
[ResponseData].self,
from: json.data(using: .utf8)!)
print(myjson)
And here's the output of the print statement, proving that we've populated our structs correctly:
[JustPlaying.ResponseData(
categoryName: "Trending",
unknown: [JustPlaying.ResponseData.Inner(
category: "Trending",
trailerPrice: "",
isFavourit: nil,
isWatchList: nil)]),
JustPlaying.ResponseData(
categoryName: "Comedy",
unknown: [JustPlaying.ResponseData.Inner(
category: "Comedy",
trailerPrice: "",
isFavourit: nil,
isWatchList: nil)])
]
Of course in real life we'd have some error-handling, no doubt!
EDIT Later I realized (in part thanks to CodeDifferent's answer) that I didn't need two containers; I can eliminate the CodingKeys enum, and my CK struct can do all the work! It is a general purpose key-maker:
init(from decoder: Decoder) throws {
let con = try! decoder.container(keyedBy: CK.self)
self.categoryName = try! con.decode(String.self, forKey:CK(stringValue:"categoryName")!)
let key = self.categoryName
self.unknown = try! con.decode([Inner].self, forKey: CK(stringValue:key)!)
}
