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class UserAnswer(models.Model):
user = models.ForeignKey(MyUser, related_name=u'answers', db_index=True)
question = models.ForeignKey(Question, verbose_name=u'вопрос', db_index=True)
theme = models.ManyToManyField(Theme, verbose_name=u'Тема', db_index=True, blank=True)
UserAnswer.objects.filter(user=user).order_by('theme__number').distinct('theme__number')
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