Python 在序列化程序中显示相关模型的多数投票成员 我有以下型号： 问题: 答复 VoteAnswer 问题序列化程序 我想要达到的目标：

问题序列化程序中应该有一个“top_answer”字段，该字段的答案得票最多。

我尝试了以下方法，但没有成功：

class QuestionSeriaizer(serializers.HyperlinkedModelSerializer):

    answer_count = serializers.SerializerMethodField()
    top_answer = serializers.SerializerMethodField()
    posted_by = UserDetailSerializer(read_only=True)

    class Meta:
        model = Question
        fields = ('url', 'id', 'question_text', 'created_at', 'updated_at', 'posted_by', 'answer_count', 'page',
                  'who_can_answer', 'top_answer')
        depth = 1

    @staticmethod
    def get_answer_count(obj):
        return obj.answers.all().count()

    @staticmethod
    def get_top_answer(obj):
        return obj.answers.annotate(total_votes=obj.answers.votes.all().count()).order_by('total_votes').first()

---

您可以使用以下方式进行尝试：

如果您有AnswerSerializer，则可以尝试：

def get_top_answer(obj):
   answer = obj.answers.annotate(total_votes=Count('votes')).order_by('total_votes').last()
   return AnswerSerializer(answer).data

---

谢谢这起作用了。虽然URL链接有一些问题，所以我删除了HyperLinkedModelSerializer。

class VoteAnswer(models.Model):
    answer = models.ForeignKey(Answer, related_name='votes', on_delete=models.CASCADE)
    voted_by = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)

class QuestionSeriaizer(serializers.HyperlinkedModelSerializer):

    answer_count = serializers.SerializerMethodField()
    posted_by = UserDetailSerializer(read_only=True)

    class Meta:
        model = Question
        fields = ('url', 'id', 'question_text', 'created_at', 'updated_at', 'posted_by', 'answer_count', 'page',
                  'who_can_answer')
        depth = 1

    @staticmethod
    def get_answer_count(obj):
        return obj.answers.all().count()

class QuestionSeriaizer(serializers.HyperlinkedModelSerializer):

    answer_count = serializers.SerializerMethodField()
    top_answer = serializers.SerializerMethodField()
    posted_by = UserDetailSerializer(read_only=True)

    class Meta:
        model = Question
        fields = ('url', 'id', 'question_text', 'created_at', 'updated_at', 'posted_by', 'answer_count', 'page',
                  'who_can_answer', 'top_answer')
        depth = 1

    @staticmethod
    def get_answer_count(obj):
        return obj.answers.all().count()

    @staticmethod
    def get_top_answer(obj):
        return obj.answers.annotate(total_votes=obj.answers.votes.all().count()).order_by('total_votes').first()

from django.db.models import Count

class QuestionSeriaizer(serializers.HyperlinkedModelSerializer):
    # rest of the code
    def get_top_answer(obj):
        return obj.answers.annotate(total_votes=Count('votes')).order_by('total_votes').first().answer_text

def get_top_answer(obj):
   answer = obj.answers.annotate(total_votes=Count('votes')).order_by('total_votes').last()
   return AnswerSerializer(answer).data