Python Django Rest框架3.0 to_表示未实现

我正在使用Django 1.7.1和Python 2.7从Django Rest Framework 2.4升级到3.0.1，无法克服以下错误：

File "/Users/bjacobel/.virtualenvs/hey/lib/python2.7/site-packages/rest_framework/fields.py", line 375, in to_representation
    raise NotImplementedError('to_representation() must be implemented.')

我使用的代码在2.4下运行得很好，我很难找到任何关于我使用的DRF类中发生了什么变化的文档。除了我的一个端点（为

django.contrib.auth.models.User

提供CRUD的端点），我注释掉了所有内容，但仍然得到了错误

serializers.py：

views.py：

URL.py：

分页.py

设置.py

---

谢谢。

问题在于您的分页序列化程序，因为您正在使用的是Django REST Framework 3.0中的

序列化程序.Field

，它现在是

序列化程序.ReadOnlyField

。这是一个细微的更改，尽管在发布公告中有提及，但对于那些重写分页的人来说，这是最值得注意的在序列化程序上

使用

ReadOnlyField

作为

count

字段。您应该能够通过交换字段来修复序列化程序

class CustomPaginationSerializer(pagination.BasePaginationSerializer):
    links = LinksSerializer(source='*')  # Takes the page object as the source
    total_results = serializers.ReadOnlyField(source='paginator.count')

    results_field = 'objects'

---

你说得对，谢谢你的帮助。我的自定义序列化程序的代码是从DRF文档中复制的，似乎还没有完全更新到3.0版本。我已经提交了一个拉取请求来修复它：

from django.contrib.auth.models import User
from hey.apps.api import serializers
from rest_framework import viewsets, permissions, filters

class User(viewsets.ModelViewSet):
    queryset = User.objects.all()
    serializer_class = serializers.UserSerializer
    permission_classes = (permissions.IsAuthenticated,)
    filter_backends = (filters.OrderingFilter,)

from django.conf.urls import patterns, url, include
from hey.apps.api import views
from rest_framework.routers import SimpleRouter

router = SimpleRouter()


router.register(r'user', views.User)

urlpatterns = patterns('',
    url(r'^', include(router.urls)),
)

from rest_framework import pagination
from rest_framework import serializers

class LinksSerializer(serializers.Serializer):
    next = pagination.NextPageField(source='*')
    prev = pagination.PreviousPageField(source='*')

class CustomPaginationSerializer(pagination.BasePaginationSerializer):
    links = LinksSerializer(source='*')  # Takes the page object as the source
    total_results = serializers.Field(source='paginator.count')

    results_field = 'objects'

REST_FRAMEWORK = {
    'DEFAULT_PAGINATION_SERIALIZER_CLASS': 'hey.apps.api.pagination.CustomPaginationSerializer',
    'PAGINATE_BY': 20,                  # Default to 20
    'PAGINATE_BY_PARAM': 'limit',       # Allow client to override, using `?limit=xxx`.
    'MAX_PAGINATE_BY': 100,             # Maximum limit allowed when using `?limit=xxx`.
    'TEST_REQUEST_DEFAULT_FORMAT': 'json',
    'DEFAULT_AUTHENTICATION_CLASSES': (
        'rest_framework.authentication.BasicAuthentication',
        'rest_framework.authentication.TokenAuthentication',
        'rest_framework.authentication.SessionAuthentication',
    )
}

class CustomPaginationSerializer(pagination.BasePaginationSerializer):
    links = LinksSerializer(source='*')  # Takes the page object as the source
    total_results = serializers.ReadOnlyField(source='paginator.count')

    results_field = 'objects'