Decoding this kind of JSON with Codable - json

Question

I have a json that looks like this:
let jsonString = """
{
"data": [
{
"name": "Apple",
"price": 44,
"available": true
},
{
"name": "Pear",
"price": 27,
"available": false
}
],
"some_stuff": [],
"some_other_stuff": []
}"""
My goal is to parse the content of the data array, specifically in a struct that doesn't care about the availibility attribute. I don't care about the some_stuff and some_other_stuff returned is that json.
First question: Can I ignore these properties event if they are part of the response at the same level as "data" which I'm interested in? If so, how do I represent and empty array of a type I ignore because I only get empty arrays? (For that part, I chose to represent it as an array of arbitrary chosen type Int?)
I created a struct:
struct Fruit: Codable {
let name: String
let price: Int
}
And a kind of super struct above:
struct WholeResponse: Codable {
let data: [Fruit]
let someStuff: [Int?]
let someOtherStuff: [Int?]
enum CodingKeys: String, CodingKey {
case data
case someStuff = "some_stuff"
case someOtherStuff = "some_other_stuff"
}
struct Fruit: Codable {
let name: String
let price: Int
}
init(from decoder: Decoder) throws {
let container = try decoder.container(keyedBy: CodingKeys.self)
let data = try container.nestedContainer(keyedBy: CodingKeys.self, forKey: .data)
name = try data.decode(String.self, forKey: .name)
price = try data.decode(Int.self, forKey: .price)
}
func encode(to encoder: Encoder) throws {
var container = encoder.container(keyedBy: CodingKeys.self)
var data = container.nestedContainer(keyedBy: CodingKeys.self, forKey: .data)
try data.encode(name, forKey: .name)
try data.encode(price, forKey: .price)
}
}
But I found myself pretty stuck after doing this:
let jsonData = jsonString.data(using: .utf8)!
let jsonDecoder = JSONDecoder()
let fruits = try jsonDecoder.decode(WholeResponse.self, from: jsonData)
I think I am missing something about the representation of my data and perhaps complicating the thing but can you help me get this data array parsed?

Answer 1

First just delete everything you don't want:
struct WholeResponse: Codable {
let data: [Fruit]
struct Fruit: Codable {
let name: String
let price: Int
}
}
Then, similar to what you had before, say
let response = try jsonDecoder.decode(WholeResponse.self, from: jsonData)
let fruits = response.data