Realm migrations in Swift

Question

I have a Realm Object modeled as so

class WorkoutSet: Object {
     // Schema 0
     dynamic var exerciseName: String = \"\"
     dynamic var reps: Int = 0
              


        

Answer 1

You will need to invoke the migration. Merely creating a configuration, won't invoke it. There are two ways of doing this:

1. Set your configuration with migration as Realm's default configuration-

   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
   
       if oldSchemaVersion < 1 {
         migration.enumerate(WorkoutSet.className()) { oldObject, newObject in
           newObject?["setCount"] = setCount
         }    
       }
     }
   ) 
   Realm.Configuration.defaultConfiguration = config   
   

OR

2. Migrate manually using migrateRealm :

migrateRealm(config)

Now your migration should work properly.