Django REST - AssertionError：`fields`必须是列表或元组

When querying Django via REST using the Django REST framework I get the error,

使用Django REST框架通过REST查询Django时出现错误，

  File "/folder/pythonenv/project/lib/python2.7/site-packages/rest_framework/serializers.py", line 241, in get_fields
    assert isinstance(self.opts.fields, (list, tuple)), '`fields` must be a list or tuple'
AssertionError: `fields` must be a list or tuple

My settings are....

我的设置是......

settings.py

settings.py

THIRD_PARTY_APPS = (
        'south',  # Database migration helpers:
        'crispy_forms',  # Form layouts
        'rest_framework',
    )

REST_FRAMEWORK = {
                'DEFAULT_PERMISSION_CLASSES': (
                    'rest_framework.permissions.AllowAny',
                )
    }

views

意见

from django.shortcuts import render
from rest_framework import viewsets
from quickstart.serializers import from quickstart.serializers import TicketInputSerializer
from models import Abc

class TicketInputViewSet(viewsets.ModelViewSet):
    queryset = Abc.objects.all()
    serializer_class = TicketInputSerializer

urls.py

urls.py

router = routers.DefaultRouter()
router.register(r'ticket', views.TicketViewSet)

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

)

Serializers

串行器

from models import Abc
from django.contrib.auth.models import User, Group
from rest_framework import serializers

class TicketInputSerializer(serializers.HyperlinkedModelSerializer):
    class Meta:
        model = Abc
        fields = ('test',)

Models

楷模

from django.db import models

class Abc(models.Model):
    test = models.CharField(max_length=12)

Any ideas ?

有任何想法吗？

2 个解决方案

#1

You need to use a tuple or list for fields, to represent a tuple with single item you need to use a trailing comma:

您需要为字段使用元组或列表，以表示需要使用尾随逗号的单个项目的元组：

fields = ('test', )

Without a comma fields = ('test') is actually equivalent to fields = 'test'.

没有逗号字段=（'test'）实际上等于fields ='test'。

From docs:

来自docs：

A special problem is the construction of tuples containing 0 or 1 items: the syntax has some extra quirks to accommodate these. Empty tuples are constructed by an empty pair of parentheses; a tuple with one item is constructed by following a value with a comma (it is not sufficient to enclose a single value in parentheses). Ugly, but effective.

一个特殊的问题是构造包含0或1项的元组：语法有一些额外的怪癖来适应这些。空元组是由一对空括号构成的;通过使用逗号跟随值来构造具有一个项目的元组（在括号中包含单个值是不够的）。丑陋但有效。

#2

('test') is not a tuple, it is the same value as simply 'test'.

（'test'）不是一个元组，它与'test'的值相同。

You should add a trailing comma to create a singleton tuple:

您应该添加一个尾随逗号来创建单例元组：

fields = ('test',)

Or you can use a list and don't bother about the commas:

或者您可以使用列表而不必担心逗号：

fields = ['test']

#1