RealmSwiftにカラムを追加してマイグレーションしたい

Question

RealmSwiftにカラムを追加してマイグレーションしたいです。
公式ドキュメントを見様見真似でやるものうまくいかず・・・

どこのファイルに公式のコードを添付してマイグレーションするのか知りたいです。

・Realm公式ドキュメンタリー
https://realm.io/docs/swift/latest/#migrations

//旧モデル
import Foundation
import RealmSwift

class Obj: Object{
    
    @objc dynamic var id = 0
    @objc dynamic var name: String?
    
    override static func primaryKey() -> String? {
           return "id"
       }
}

import Foundation
import RealmSwift

class Obj: Object{
    
    @objc dynamic var id = 0
    @objc dynamic var name: String?
    @objc dynamic var profile: String? // プロフィールカラム追加
    
    override static func primaryKey() -> String? {
           return "id"
       }
}

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
    

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        
        let config = Realm.Configuration(
            // Set the new schema version. This must be greater than the previously used
            // version (if you've never set a schema version before, the version is 0).
            schemaVersion: 1,

            // Set the block which will be called automatically when opening a Realm with
            // a schema version lower than the one set above
            migrationBlock: { migration, oldSchemaVersion in
                // We haven’t migrated anything yet, so oldSchemaVersion == 0
                if (oldSchemaVersion < 1) {
                    // Nothing to do!
                    // Realm will automatically detect new properties and removed properties
                    // And will update the schema on disk automatically
                }
            })

        // Tell Realm to use this new configuration object for the default Realm
        Realm.Configuration.defaultConfiguration = config

        // Now that we've told Realm how to handle the schema change, opening the file
        // will automatically perform the migration
        let realm = try! Realm()
        
        
        return true
        
    }

Comments

[ch3cooh]

追加されたprofileフィールドはString?型なので、`schemaVersion` の `1` を `2`にあげるだけでうまくマイグレーションされないでしょうか？

[sunglass]

schemaVersionを2に変更したら出来ました！
（import RealmSwiftも忘れてました・・・）

[sunglass]

ありがとうございます！

Answer 1

頂いたアドバイスのお陰で解決しました。

• schemaVersionを2に変更
• import RealmSwift（書き忘れ）

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {


    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.

        let config = Realm.Configuration(
            // Set the new schema version. This must be greater than the previously used
            // version (if you've never set a schema version before, the version is 0).
            schemaVersion: 1,

            // Set the block which will be called automatically when opening a Realm with
            // a schema version lower than the one set above
            migrationBlock: { migration, oldSchemaVersion in
                // We haven’t migrated anything yet, so oldSchemaVersion == 0
                if (oldSchemaVersion < 1) {
                    // Nothing to do!
                    // Realm will automatically detect new properties and removed properties
                    // And will update the schema on disk automatically
                }
            })

        // Tell Realm to use this new configuration object for the default Realm
        Realm.Configuration.defaultConfiguration = config

        // Now that we've told Realm how to handle the schema change, opening the file
        // will automatically perform the migration
        let realm = try! Realm()


        return true

    }