data migration.py

class Migration(DataMigration):

    def forwards(self, orm):
        for todo in orm.Todo.objects.all():
            if todo.all_day or todo.location:
                obj = orm.Event()
                obj.all_day = todo.all_day
                obj.location = todo.location
                obj.end_date = todo.due_date
            else:
                obj = orm.Task()
                obj.due_date = todo.due_date
                
            obj.title = todo.title
            obj.start_date = todo.start_date
            obj.due_date = todo.due_date
            obj.date_created = todo.date_created
            obj.owner = todo.owner
            obj.save()
            if todo.body:
                note = orm.Note(body=todo.body)
                note.save()
                obj.notes.add(note)


    def backwards(self, orm):
        "all data is only copied anyway, so no backward code needed"