Example

gistfile1.txt

import Foundation
import RealmSwift
import ObjectMapper

class RealmUser: Object, Mappable {
    
    dynamic var id = "" // id
    dynamic var phoneNumber = ""
    dynamic var isMain = false
    dynamic var userInfo: RealmUserInfo? = nil 
    
    // MARK: - Local data
    
    /// It is used to find a user number among the contacts that are used on the device. And set the indicator.
    dynamic var localPhoneNumberID: String?
    
    override class func primaryKey() -> String? {
        return "id"
    }
    
    convenience required init?(map: Map) {
        self.init()
    }
    
    func mapping(map: Map) {
        if map.mappingType == .fromJSON {
            id <- map["id"]
            phoneNumber <- map["phoneNumber"]
            isMain <- map["isMain"]
            userInfo <- map["userInfo"]
        } else {
            id >>> map["id"]
            phoneNumber >>> map["phoneNumber"]
            isMain >>> map["isMain"]
            userInfo >>> map["userInfo"]
        }
    }
    
}

//  RealmUserInfo.swift
//  SwiftChats
//
//  Created by Alexsander Khitev on 2/6/17.
//  Copyright © 2017 Alexsander Khitev. All rights reserved.
//

import Foundation
import RealmSwift
import ObjectMapper

class RealmUserInfo: Object, Mappable {
    
    dynamic var id = ""
    dynamic var firstName = ""
    dynamic var lastName = ""
    dynamic var photoPath: String?
    
    override class func primaryKey() -> String? {
        return "id"
    }

    convenience required init?(map: Map) {
        self.init()
    }
    
    func mapping(map: Map) {
        if map.mappingType == .fromJSON {
            id <- map["id"]
            firstName <- map["firstName"]
            lastName <- map["lastName"]
            photoPath <- map["photoPath"]
        } else {
            id >>> map["id"]
            firstName >>> map["firstName"]
            lastName >>> map["lastName"]
            photoPath >>> map["photoPath"]
        }
    }
    
}