MigrationBefore.java

public class Migration implements RealmMigration
{
    @Override
    public void migrate (DynamicRealm realm, long oldVersion, long newVersion)
    {
        RealmSchema schema = realm.getSchema();

        if ( oldVersion == 1 )
        {
            RealmObjectSchema recipeSchema = schema.get( "Recipe" );
            recipeSchema.addField( RecipeFields.NUMBER_OF_STARS, Integer.class )
                        .transform( new RealmObjectSchema.Function()
                        {
                            @Override
                            public void apply (DynamicRealmObject obj)
                            {
                                obj.setInt( RecipeFields.NUMBER_OF_STARS, 5 );
                            }
                        } );

            oldVersion++;
        }

        if ( oldVersion == 2 )
        {
            RealmObjectSchema recipeSchema = schema.get( "Recipe" );
            recipeSchema.addField( RecipeFields.IS_YUMMY, boolean.class );
        }

    }
}