realm migration, cannot add property - swift

Question

testing realm, cannot add a new property to my testing class. Followed documentation and some answer here but both are not working. In my code even the "plain" empty default block for migration is not working, using updated realm.
getting this error
Thread 1: Fatal error: 'try!' expression unexpectedly raised an error: Error Domain=io.realm Code=10 "Migration is required due to the following errors:
- Property 'ComicType.creationDate' has been added." UserInfo={NSLocalizedDescription=Migration is required due to the following errors:
- Property 'ComicType.creationDate' has been added., Error Code=10}
it seems I'm not changing the schemaVersion, but I did in the "basic" migration block. I check the schema version in app delegate with:
let configCheck = Realm.Configuration();
do {
let fileUrlIs = try schemaVersionAtURL(configCheck.fileURL!)
print("schema version \(fileUrlIs)")
} catch {
print(error)
}
my AppDelegate:
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
let config = Realm.Configuration(schemaVersion: 1, migrationBlock: { migration, oldSchemaVersion in
if (oldSchemaVersion < 1) {
}
})
Realm.Configuration.defaultConfiguration = config
_ = try! Realm()
return true
}
my class:
import Foundation
import RealmSwift
class ComicType: Object {
#objc dynamic var name : String = ""
#objc dynamic var creationDate : Date? //the new property
}

Answer 1

Issue solved this way: the real issue is not about schema number, but about not calling at all the migration code, I realized the migration schema remained always the same. True error is calling let realm = try! Realm() in my view controller using it as global constant. Now using lazy var realm = try! Realm() Great help found here . Now after each change in my model, I update in appDelegate the schemaVersion.

Answer 2

What worked for was to remove the app from the iOS Simulator, and then run it again using XCode. More about this is found here: https://github.com/RocketChat/Rocket.Chat.iOS/issues/104
I was facing a similar issue, my error stack trace was beginning like this:
`fatal error: 'try!' expression unexpectedly raised an error: Error Domain=io.realm Code=10 "Migration is required due to the following errors:
The errors shown was just confirming the some objects have been saved locally. so, there was no clue on what caused the problem.
What I figured was, the issue was that the schema of Realm Database was violated, since I updated the Objects' classes that I have been saving locally. So, it requested that I update the schema.
I suppose that a new Realm file with is created when the app is removed and run again. If so, then a new schema is created that works with latest code