Uso do Select Extra

gistfile1.py

alternatives = Alternative.objects.filter(exercise=exercise)
select_sql = u'''select courses_solveexercise.response 
                 from courses_solveexercise where
                 courses_solveexercise.user_id=%s and
                 courses_solveexercise.alternative_id=courses_alternative.id'''
alternatives = alternatives.extra(select=SortedDict([('user_response', select_sql)]),
                                  select_params=[user.id])