We're trying to migrate Realm from 1.x to a 2.x version. Do we need to provide migration in this case? We would like to keep the data obviously, but I think Realm deletes it if you update the app now. We havent released the 2.x version yet so now we need to deal with migration.
Android Realm migrating from 1.x to 2.x
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What behavior have you experienced when upgrading from 1.x to 2.x on a test device?
If you have deletedRealmIfMigrationNeeded() set on your RealmConfiguration then it will delete the data. You will need remove that line from your RealmConfiguration and add a migration(YourMigration.class)
I would recommend a lot of testing for this changing, and ensure you add all past database changes the migration.
See here for information on how to do a migration: https://realm.io/docs/java/latest/#migrations
The Realm should be migrated automatically to the new format going from 1.x to 2.x since the file format changed.
https://blog.realm.io/realm-java-2-0-mobile-platform-support/