Django TypeError：“ User”对象不可迭代在序列化期间弹出

Question

我的django项目有问题。 我正在使用django rest框架，似乎我在序列化期间做错了什么。 所以这里是问题：

我有一个APIview应该向用户返回JSON，该令牌应通过令牌进行身份验证。 这个json应该包含今天的用户类列表。下面是代码：

class StudentTodayScheduleView(views.APIView):
    """
    API that returns JSON with schedule for user who is requesting
    """
    authentication_classes = (TokenAuthentication,)
    permission_classes = (IsAuthenticated, )

    def get(self, request, format=None):
        user = request.user
        usergroup = ProfileModel.objects.filter(user=user)[0].student_group
        current_weekday = datetime.date.today().weekday()  # integer 0-monday .. 6-Sunday
        today = WorkingDay.objects.get(dayoftheweeknumber=current_weekday)

        todaysdate = datetime.date.today()
        weektype = get_weektype(todaysdate)

        classes_for_today = Para.objects.filter(para_group=usergroup, para_day=today, week_type=weektype)
        result = dict()
        for para in classes_for_today:
                result.update(ParaSerializer(para).data)

        return Response(result, status=status.HTTP_200_OK)

这是ParaSerializer：

class ParaSerializer(serializers.ModelSerializer):
    para_subject = DisciplineSerializer()
    para_room = RoomSerializer()
    para_professor = ProfileSerializer(read_only=True)
    para_number = ParaTimeSerializer()
    para_day = WorkingDaySerializer()
    # para_group = StudentGroupSerializer()

    class Meta:
        model = Para
        fields = (
            'para_subject',
            'para_room',
            'para_professor', 
            'para_number',
            'para_day',
            'para_group',
            'week_type'
    )

这是控制台显示的内容：

ProfileModel及其添加到默认django用户模型的其他模型。 ProfileModel与用户具有OneToOneField。

如果我尝试在外壳中序列化Para对象-可以。 但是，如果我尝试从序列化的para对象中取出数据-我将得到与屏幕截图相同的错误。 另外，如果我注释掉序列化程序类中的para_professor字段-我不会收到错误。

请解释我在做什么错。

谢谢您的时间Taras

更新：

参数模型，用户和配置文件序列化器：

class Para(models.Model):

    class Meta(object):
        verbose_name = u"Class"
        verbose_name_plural = u"Classes"

    para_subject = models.ForeignKey(
        'Disciplines',
        blank=True,
        null=True,
        verbose_name=u"Discipline"
    )
    para_room = models.ForeignKey(
        'Rooms',
        blank=True,
        null=True,
        verbose_name=u"Room"
    )
    para_professor = models.ForeignKey(
        'students.ProfileModel',
        blank=True,
        null=True,
        verbose_name=u"Professor"
    )
    para_number = models.ForeignKey(
        'ParaTime',
        blank=True,
        null=True,
        verbose_name=u"Class Starts/Ends"
    )
    para_day = models.ForeignKey(
        WorkingDay,
        blank=True,
        null=True,
        verbose_name=u"Working day")

    para_group = models.ForeignKey(
        'StudentGroupModel',
        blank=True,
        null=True,
        verbose_name=u"Student Group"
    )
    week_type = models.BooleanField(
        default=True,
        verbose_name=u"Is week even"
    )

    def __unicode__(self):
        return u"%s %s" % (self.para_subject, self.para_room)


class UserSerializer(serializers.ModelSerializer):
    groups = GroupSerializer(read_only=True, many=True)
    class Meta:
        model = User
        fields = (
            'username',
            'email',
            'groups',
            'first_name',
            'last_name'
        )


class ProfileSerializer(serializers.ModelSerializer):
    user = UserSerializer(read_only=True, many=True)

    class Meta:
        model = ProfileModel
        fields = (
            'user',
            'is_student',
            'student_group',
            'middle_name',
            'contact_phone',
            'photo',
            'started_date'
        )

Answer 1

您的ProfileSerializer定义的user具有many=True ，但是每个配置文件只有一个用户。