How to make a JSON model - json

Question

I know you have to create a model of the expected JSON. I’m having trouble creating one from the Airtable API.
Here is my data:
{
"id": "recBOdydIpM2P3xkZ",
"createdTime": "2022-04-26T17:47:12.000Z",
"fields": {
"% GP": "32.31%",
"Total Rx": 103,
"Gross Profit": 1534.77,
"Total Received": 4749.55,
"Date": "2022-04-25",
"Copay": 2469.43,
"Acquisition Cost": 3214.78,
"Average GP": 14.9,
"TP Remitted": 2280.12
}
}
Here’s my model:
struct Record: Codable, Identifiable {
var id = UUID()
let createdTime: Date
let fields: //where im stuck :(
}

Answer 1

Make a new struct called Fields:
struct Record: Codable, Identifiable {
var id = UUID()
let createdTime: Date
let fields: Fields
struct Fields: Codable {
let gpPercent: String
let totalRx: Int
[...]
enum CodingKeys: String, CodingKey {
case gpPercent = "% GP"
case totalRx = "Total Rx"
[...]
}
}
enum CodingKeys: String, CodingKey {
case id
case createdTime
case fields
}
}

Answer 2

This is a broad question with multiple possible solutions. A model is basically what you want the objects you're building to look like. I would recommend looking into object oriented programming, like here: https://www.raywenderlich.com/599-object-oriented-programming-in-swift
Here is one possible solution:
struct Record: Codable, Identifiable {
var id = UUID
let createdTime: Date
let percentGP: Int
let totalRx: Int
let grossProfit: Double
let totalReceived: Double
let date: Date
let copay: Double
let acquisitionCost: Double
let averageGP: Double
let TPRemitted: Double
}
If you need to decode "fields" as a category into SwiftUI, you could create it as a separate object, like:
struct RecordData: Codable {
let percentGP: Int
// etc
}
and then, in Record:
struct Record: Codable, Identifiable {
var id = UUID
let createdTime: Date
let fields: RecordData
}
I am not using "Fields" as the name on purpose, to avoid confusion with plurals. You could use it, just be wary of using a single entity of Fields, not something like [Fields].