рамки Django Rest - Если таблица содержит данные в ответ, показывая ошибку сервера (500)

Question

Я использую DjangoRestFramework для апи отдыха

В запросе GET Если нет данных в таблице ответ показывает пустым. Если в таблице есть данные, в ответе отображается пустая ошибка сервера (500).

происходит некорректно мой код

models.py

from __future__ import unicode_literals 
from django.db import models 

# Create your models here. 
class Employee(models.Model): 
    name = models.CharField(max_length=100) 
    address = models.CharField(max_length=200) 

serializers.py

from rest_framework import serializers 
from firstexample.models import Employee 

class employeeSerializer(serializers.ModelSerializer): 
    class Meta: 
     model = Employee 
     fields = ('name', 'address') 

views.py

from django.shortcuts import render 
from rest_framework.views import APIView 
from rest_framework.response import Response 
from rest_framework import status 
from rest_framework import viewsets 
from firstexample.models import Employee 
from firstexample.serializers import employeeSerializer 
# Create your views here. 


class employeeList(APIView): 

    def get(self, request, format=None): 
     employees = Employee.objects.all() 
     serializer = employeeSerializer(employees, many=True) 
     return Response(serializer.data) 

    def post(self, request, format=None): 
     serializer = employeeSerializer(data=request.data) 
     print(request.data) 
     if serializer.is_valid(): 
      serializer.save() 
      return Response(serializer, status=status.HTTP_201_CREATED) 
     return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST) 

urls.py

from django.conf.urls import url 
from django.contrib import admin 
from firstexample import views 

urlpatterns = [ 
    url(r'^admin/', admin.site.urls), 
    url(r'^employeesList/$', views.employeeList.as_view()), 
] 

Может любой, пожалуйста, помогите мне. Я потратил больше времени на это, но я не понял эту проблему.

Заранее спасибо.

Код ошибки

Performing system checks... 

System check identified no issues (0 silenced). 
December 05, 2015 - 07:50:03 
Django version 1.10.dev20151112003354, using settings 'helloworld.settings' 
Starting development server at http://127.0.0.1:8000/ 
Quit the server with CONTROL-C. 
<QuerySet [<Employee: Employee object>]> 
Internal Server Error: /employeesList/ 
Traceback (most recent call last): 
    File "/Users/jaikakkar/Desktop/Python/django/django/core/handlers/base.py", line 149, in get_response 
    response = self.process_exception_by_middleware(e, request) 
    File "/Users/jaikakkar/Desktop/Python/django/django/core/handlers/base.py", line 147, in get_response 
    response = wrapped_callback(request, *callback_args, **callback_kwargs) 
    File "/Users/jaikakkar/Desktop/Python/django/django/views/decorators/csrf.py", line 58, in wrapped_view 
    return view_func(*args, **kwargs) 
    File "/Users/jaikakkar/Desktop/Python/django/django/views/generic/base.py", line 68, in view 
    return self.dispatch(request, *args, **kwargs) 
    File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/rest_framework/views.py", line 466, in dispatch 
    response = self.handle_exception(exc) 
    File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/rest_framework/views.py", line 463, in dispatch 
    response = handler(request, *args, **kwargs) 
    File "/Users/jaikakkar/Desktop/pythonlearning/helloworld/firstexample/views.py", line 17, in get 
    print(serializer.data) 
    File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/rest_framework/serializers.py", line 674, in data 
    ret = super(ListSerializer, self).data 
    File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/rest_framework/serializers.py", line 239, in data 
    self._data = self.to_representation(self.instance) 
    File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/rest_framework/serializers.py", line 614, in to_representation 
    self.child.to_representation(item) for item in iterable 
    File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/rest_framework/serializers.py", line 459, in to_representation 
    fields = self._readable_fields 
    File "/Users/jaikakkar/Desktop/Python/django/django/utils/functional.py", line 33, in __get__ 
    res = instance.__dict__[self.name] = self.func(instance) 
    File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/rest_framework/serializers.py", line 353, in _readable_fields 
    field for field in self.fields.values() 
    File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/rest_framework/serializers.py", line 339, in fields 
    for key, value in self.get_fields().items(): 
    File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/rest_framework/serializers.py", line 918, in get_fields 
    info = model_meta.get_field_info(model) 
    File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/rest_framework/utils/model_meta.py", line 69, in get_field_info 
    reverse_relations = _get_reverse_relationships(opts) 
    File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/rest_framework/utils/model_meta.py", line 137, in _get_reverse_relationships 
    for relation in opts.get_all_related_objects(): 
AttributeError: 'Options' object has no attribute 'get_all_related_objects' 
[05/Dec/2015 07:50:04] "GET /employeesList/ HTTP/1.1" 500 114115 

Answer 1

DRF версии 3+ не работает с Django 1.1 (что на вашем StackTrace выше), она требует Django 1.7+. Перейдите к последней версии Django и удалите format=None с помощью метода .get(), на ваш взгляд.