kmkrn

import Foundation
import Realm
import RealmSwift

class Cat: Object, Decodable {
    @objc dynamic var catId: Int = 0
    @objc dynamic var name: String = ""
    @objc dynamic var breed: String = ""
    @objc dynamic var weight: Double = 0
        

kmkrn

import Foundation
import RealmSwift

class JSONSerializer {
    func serialize(input sourceName: String) {
        let path = Bundle.main.path(forResource: sourceName, ofType: nil)
        let url = URL(fileURLWithPath: path!)
        let jsonDecoder = JSONDecoder()
        do {
            let data = try Data(contentsOf: url)

kmkrn

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        let serializer = JSONSerializer()
        serializer.serialize(input: "Cats")
        return true
    }
}

kmkrn

po Realm.Configuration.defaultConfiguration.fileURL

kmkrn

[
  {
    "personId": 1,
    "firstName": "John",
    "lastName": "Smith",
    "cats": [
      {
        "catId": 1,
        "name": "Ashes",
        "breed": "Bengal",

kmkrn

import Foundation
import Realm
import RealmSwift

class CatPerson: Object, Decodable {
    @objc dynamic var personId: Int = 0
    @objc dynamic var firstName: String = ""
    @objc dynamic var lastName: String = ""
    var cats = List<Cat>()

kmkrn

        let catsArray = try container.decode([Cat].self, forKey: .cats)
        let catsList = List<Cat>()
        catsList.append(objectsIn: catsArray)

kmkrn

import Foundation
import Realm
import RealmSwift

class CatPerson: Object, Decodable {
    @objc dynamic var personId: Int = 0
    @objc dynamic var firstName: String = ""
    @objc dynamic var lastName: String = ""
    var cats = List<Cat>()

kmkrn

import Foundation
import RealmSwift

class JSONSerializer {
    func serialize(input sourceName: String) {
        let path = Bundle.main.path(forResource: sourceName, ofType: nil)
        let url = URL(fileURLWithPath: path!)
        let jsonDecoder = JSONDecoder()
        do {
            let data = try Data(contentsOf: url)

kmkrn

        let realm = try! Realm()
        try! realm.write {
            realm.deleteAll()
        }
        let serializer = JSONSerializer()
        serializer.serialize(input: "CatPeople")