AttributeError: 'property' 对象没有属性 'copy' - 试图在 Django Rest 中获取对象列表

Question

为了练习我的 Django 技能，我尝试制作简单的模块，它应该或多或少地像 Django 中的管理站点一样工作。它应该从应用程序收集所有模型，列出它们并显示每个模型中的每个对象。我尝试做的是使用 Django Rest Framework。

这是我的views.py。我有 2 个观点。api_root 侦听所有模型，但它也会将 params-models_names 发送到另一个视图“model_view”。ModelViewSet 应该列出来自特定模型的所有对象。

class ModelsViewSet(viewsets.ModelViewSet):
    def get_serializer(self, *args, **kwargs):
        serializer_name = '{model_name}Serializer'.format(
            model_name=self.kwargs.get('name').split(".")[1]
        )
        return getattr(serializers, serializer_name)

    def get_model(self):
        """methods return model based on name kwargs

        :return:
        """
        return apps.get_model(self.kwargs.get('name'))

    def get_queryset(self):
        return self.get_model().objects.all()

    def get_object(self):
        return self.get_model().objects.get(pk=self.kwargs.get('pk'))


@api_view(['GET'])
def api_root(request, format=None):
    return Response([reverse(
             viewname='model_view',
             kwargs={'name': i._meta.label}) for i in apps.get_models()])

这是我的 serializers.py。在这个文件中，序列化器类是动态构建的。每个类都建立在 django.apps 模型的基础上。

from django.apps import apps
from rest_framework import serializers
from admin_site import serializers as m
from . import models


app_models = apps.get_models()

for item in app_models:

    name = "{}Serializer".format(item.__name__)

    class Meta(type):
        model = item
        fields = '__all__'

    m.__dict__[name] = type(name, (serializers.ModelSerializer,), {})
    m.__dict__[name].__metaclass__ = Meta

最后这是我的 my_app.urls.py 文件。我认为问题可能在于 ModelSetView 没有使用 DefaultRouter() 注册，但另一方面我需要将参数传递给 urlpattern。我不知道

urlpatterns = [
    url(r'^$', views.api_root),
    url(r'^model/(?P<name>[\w\-\.]+)/$',
        views.ModelsViewSet.as_view({'get': 'list', 'put':'update'}), name='model_view'),
    url(r'^api-auth/', include('rest_framework.urls', namespace='rest_framework'))

]

当我在 api_root 上时一切都很好，我可以看到模型列表。但是当我添加到根 url /model/auth.User/ 时，我收到此错误：

Traceback (most recent call last):
  File "/home/wojjak/Projects/envs/taskenvv/lib/python3.6/site-
packages/django/core/handlers/exception.py", line 41, in inner
    response = get_response(request)
  File "/home/wojjak/Projects/envs/taskenvv/lib/python3.6/site-
packages/django/core/handlers/base.py", line 217, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/home/wojjak/Projects/envs/taskenvv/lib/python3.6/site-
packages/django/core/handlers/base.py", line 215, in _get_response
    response = response.render()
  File "/home/wojjak/Projects/envs/taskenvv/lib/python3.6/site-
packages/django/template/response.py", line 107, in render
    self.content = self.rendered_content
  File "/home/wojjak/Projects/envs/taskenvv/lib/python3.6/site-
packages/rest_framework/response.py", line 72, in rendered_content
    ret = renderer.render(self.data, accepted_media_type, context)
  File "/home/wojjak/Projects/envs/taskenvv/lib/python3.6/site-
packages/rest_framework/renderers.py", line 716, in render
    context = self.get_context(data, accepted_media_type, 
renderer_context)
  File "/home/wojjak/Projects/envs/taskenvv/lib/python3.6/site-
packages/rest_framework/renderers.py", line 650, in get_context
    raw_data_put_form = self.get_raw_data_form(data, view, 'PUT', 
request)
  File "/home/wojjak/Projects/envs/taskenvv/lib/python3.6/site-
packages/rest_framework/renderers.py", line 565, in get_raw_data_form
    data = serializer.data.copy()
AttributeError: 'property' object has no attribute 'copy'

任何线索我可以做些什么来完成我的任务并避免这个错误？

Answer 1

get_serializer_class()不覆盖get_serializer()