How can I get the migration to run before the app starts to run the code?

Question

I\'m using realm.io in a swift app. This is the first time I\'ve had to run a migration since I have an app in production. I changed one of the models and added a couple of

Answer 1

This works as intended, throwing exceptions when the downgrading (if working with branches where the versions differ) etc. Some sample migrations are shown too.

    Realm.Configuration.defaultConfiguration = Realm.Configuration(
        // Update this number for each change to the schema.
        schemaVersion: 4,
        migrationBlock: { migration, oldSchemaVersion in
            if oldSchemaVersion < 2 {
                migration.enumerate(SomeObject.className()) { oldObject, newObject in
                    newObject!["newColumn"] = Enum.Unknown.rawValue
                }
            }
            if oldSchemaVersion < 3 {
                migration.enumerate(SomeOtherObject.className()) { oldObject, newObject in
                    newObject!["defaultCreationDate"] = NSDate(timeIntervalSince1970: 0)
                }
            }
            if oldSchemaVersion < 4 {
                migration.enumerate(SomeObject.className()) { oldObject, newObject in
                    // No-op.
                    // dynamic properties are defaulting the new column to true
                    // but the migration block is still needed
                }
            }
    })

Obviously that won't compile as is with the SomeObject etc., but you get the idea :)