我的模型与直通模型有多对多的关系。我正在尝试设置DRF序列化程序来显示此数据，但每当我尝试呈现API时，我都会收到错误消息。
# models.py - simplified
class Person(models.Model):
first_name = models.CharField(max_length=250)
last_name = models.CharField(max_length=250)
status = models.IntegerField(choices=STATUS_CHOICES)
village = models.ForeignKey(Village)
gender = models.IntegerField(choices=GENDER_CHOICES)
class Case(models.Model):
summary = models.TextField()
session = models.ForeignKey(Session, on_delete=models.CASCADE)
case_type = models.ForeignKey(CaseType)
court_type = models.IntegerField(choices=COURT_TYPES)
verdict = models.ForeignKey(Verdict)
litigants = models.ManyToManyField(Person, through='Litigant', related_name='litigants')
class Litigant(models.Model):
person = models.ForeignKey(Person, on_delete=models.CASCADE)
case = models.ForeignKey(Case, on_delete=models.CASCADE)
role = models.ForeignKey(Role)
fine = models.ForeignKey(Money, null=True, related_name='fine')
我的serializers.py看起来像这样：
# serializers.py - simplified
class LitigantSerializer(FlexFieldsModelSerializer):
class Meta:
model = Litigant
fields = ('id', 'person', 'case', 'role', 'fine')
class CaseSerializer(FlexFieldsModelSerializer):
litigants = LitigantSerializer(many=True, read_only=True)
class Meta:
model = Case
fields = ('id', 'summary', 'session', 'case_type', 'court_type', 'verdict', 'litigants')
class PersonSerializer(FlexFieldsModelSerializer):
class Meta:
model = Person
fields = ('id','first_name', 'last_name', 'village', 'status', 'gender')
我的views.py是：
# views.py - simplified.
class PersonViewSet(FlexFieldsModelViewSet):
queryset = Person.objects.all().order_by('village__name', 'last_name', 'first_name')
serializer_class = PersonSerializer
class CaseViewSet(FlexFieldsModelViewSet):
queryset = Case.objects.all().order_by('session__village__name', 'session__date', 'court_type')
serializer_class = CaseSerializer
class LitigantViewSet(FlexFieldsModelViewSet):
queryset = Litigant.objects.all().order_by('case__session__village__name', 'case__session__date', 'person__last_name',
'person__first_name')
serializer_class = LitigantSerializer
但是，当我导航到api/cases/时，我收到以下错误：
'Person' object has no attribute 'person'
我不确定为什么要使用＆＃39; person＆＃39;作为Person对象的标识符，而不是其PK。我在这里缺少什么吗？
这是请求的堆栈跟踪。
Traceback:
File "/home/vagrant/.virtualenvs/medievaldb/lib/python3.4/site-packages/django/core/handlers/exception.py" in inner
41. response = get_response(request)
File "/home/vagrant/.virtualenvs/medievaldb/lib/python3.4/site-packages/django/core/handlers/base.py" in _get_response
187. response = self.process_exception_by_middleware(e, request)
File "/home/vagrant/.virtualenvs/medievaldb/lib/python3.4/site-packages/django/core/handlers/base.py" in _get_response
185. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/home/vagrant/.virtualenvs/medievaldb/lib/python3.4/site-packages/django/views/decorators/csrf.py" in wrapped_view
58. return view_func(*args, **kwargs)
File "/home/vagrant/.virtualenvs/medievaldb/lib/python3.4/site-packages/rest_framework/viewsets.py" in view
90. return self.dispatch(request, *args, **kwargs)
File "/home/vagrant/.virtualenvs/medievaldb/lib/python3.4/site-packages/rest_framework/views.py" in dispatch
489. response = self.handle_exception(exc)
File "/home/vagrant/.virtualenvs/medievaldb/lib/python3.4/site-packages/rest_framework/views.py" in handle_exception
449. self.raise_uncaught_exception(exc)
File "/home/vagrant/.virtualenvs/medievaldb/lib/python3.4/site-packages/rest_framework/views.py" in dispatch
486. response = handler(request, *args, **kwargs)
File "/home/vagrant/.virtualenvs/medievaldb/lib/python3.4/site-packages/rest_flex_fields/views.py" in list
28. return super(FlexFieldsMixin, self).list(request, *args, **kwargs)
File "/home/vagrant/.virtualenvs/medievaldb/lib/python3.4/site-packages/rest_framework/mixins.py" in list
45. return self.get_paginated_response(serializer.data)
File "/home/vagrant/.virtualenvs/medievaldb/lib/python3.4/site-packages/rest_framework/serializers.py" in data
739. ret = super(ListSerializer, self).data
File "/home/vagrant/.virtualenvs/medievaldb/lib/python3.4/site-packages/rest_framework/serializers.py" in data
263. self._data = self.to_representation(self.instance)
File "/home/vagrant/.virtualenvs/medievaldb/lib/python3.4/site-packages/rest_framework/serializers.py" in to_representation
657. self.child.to_representation(item) for item in iterable
File "/home/vagrant/.virtualenvs/medievaldb/lib/python3.4/site-packages/rest_framework/serializers.py" in <listcomp>
657. self.child.to_representation(item) for item in iterable
File "/home/vagrant/.virtualenvs/medievaldb/lib/python3.4/site-packages/rest_framework/serializers.py" in to_representation
501. ret[field.field_name] = field.to_representation(attribute)
File "/home/vagrant/.virtualenvs/medievaldb/lib/python3.4/site-packages/rest_framework/serializers.py" in to_representation
657. self.child.to_representation(item) for item in iterable
File "/home/vagrant/.virtualenvs/medievaldb/lib/python3.4/site-packages/rest_framework/serializers.py" in <listcomp>
657. self.child.to_representation(item) for item in iterable
File "/home/vagrant/.virtualenvs/medievaldb/lib/python3.4/site-packages/rest_framework/serializers.py" in to_representation
488. attribute = field.get_attribute(instance)
File "/home/vagrant/.virtualenvs/medievaldb/lib/python3.4/site-packages/rest_framework/relations.py" in get_attribute
179. return get_attribute(instance, self.source_attrs)
File "/home/vagrant/.virtualenvs/medievaldb/lib/python3.4/site-packages/rest_framework/fields.py" in get_attribute
103. instance = getattr(instance, attr)
Exception Type: AttributeError at /api/cases/
Exception Value: 'Person' object has no attribute 'person'