Python ';ListSerializer';对象不可调用
我正在尝试为带有content_类型对象的投票应用程序实现Django Rest框架。我尝试使用for serializers.py。在我看来,这个错误可能在serializer.py/views.py中,但我是这个框架的新手,非常感谢您的帮助 views.py:Python ';ListSerializer';对象不可调用,python,django,serialization,django-rest-framework,Python,Django,Serialization,Django Rest Framework,我正在尝试为带有content_类型对象的投票应用程序实现Django Rest框架。我尝试使用for serializers.py。在我看来,这个错误可能在serializer.py/views.py中,但我是这个框架的新手,非常感谢您的帮助 views.py: class vote_detail(generics.RetrieveUpdateDestroyAPIView): queryset = VotedItem.objects.all() serializer_class
class vote_detail(generics.RetrieveUpdateDestroyAPIView):
queryset = VotedItem.objects.all()
serializer_class = VoteSerializer(queryset, many=True)
serializers.py:
from rest_framework import serializers
from .models import VotedItem
from posts.models import Post
from generic_relations.relations import GenericRelatedField
class PostSerializer(serializers.ModelSerializer):
class Meta:
model = Post
fields = ('title',)
class VoteSerializer(serializers.ModelSerializer):
"""
A `VotedItem` serializer with a `GenericRelatedField` mapping all possible
models to their respective serializers.
"""
voted_object = GenericRelatedField({
Post: PostSerializer(),
})
class Meta:
model = VotedItem
fields = ('user', 'voted_object')
和models.py:
from __future__ import unicode_literals
from datetime import datetime
from django.utils.encoding import python_2_unicode_compatible
from django.db import models
from django.contrib.contenttypes.fields import GenericForeignKey, GenericRelation
from django.contrib.contenttypes.models import ContentType
from django.core.urlresolvers import reverse
from django.utils import timezone
from django.contrib.auth.models import User
from social_count.managers import VoteManager
SCORES = (
(+1, '+1'),
(-1, '-1'),
)
@python_2_unicode_compatible
class VotedItem(models.Model):
"""
A vote on an object by a User.
"""
user = models.ForeignKey(User)
content_type = models.ForeignKey(
ContentType,
null=True,
blank=True,
on_delete=models.CASCADE,
)
object_id = models.PositiveIntegerField(
null=True,
)
content_object = GenericForeignKey('content_type', 'object_id')
vote = models.SmallIntegerField(choices=SCORES, blank=True, null=True)
flag = models.NullBooleanField(blank=True, null=True)
timestamp = models.DateTimeField(auto_now=False, auto_now_add=True)
objects = VoteManager()
class Meta:
db_table = 'votes'
# One vote per user per object
unique_together = (('user', 'content_type', 'object_id'),)
def __str__(self):
return '%s: %s on %s' % (self.user, self.vote, self.content_object)
def is_upvote(self):
return self.vote == 1
def is_downvote(self):
return self.vote == -1
当我访问www.mypage.com/likes/api/1/时,我收到一条错误消息:
Traceback:
File "/home/henry/newpine/src/env/local/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
149. response = self.process_exception_by_middleware(e, request)
File "/home/henry/newpine/src/env/local/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
147. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/home/henry/newpine/src/env/local/lib/python2.7/site-packages/django/views/decorators/csrf.py" in wrapped_view
58. return view_func(*args, **kwargs)
File "/home/henry/newpine/src/env/local/lib/python2.7/site-packages/django/views/generic/base.py" in view
68. return self.dispatch(request, *args, **kwargs)
File "/home/henry/newpine/src/env/local/lib/python2.7/site-packages/rest_framework/views.py" in dispatch
466. response = self.handle_exception(exc)
File "/home/henry/newpine/src/env/local/lib/python2.7/site-packages/rest_framework/views.py" in dispatch
463. response = handler(request, *args, **kwargs)
File "/home/henry/newpine/src/env/local/lib/python2.7/site-packages/rest_framework/generics.py" in get
286. return self.retrieve(request, *args, **kwargs)
File "/home/henry/newpine/src/env/local/lib/python2.7/site-packages/rest_framework/mixins.py" in retrieve
57. serializer = self.get_serializer(instance)
File "/home/henry/newpine/src/env/local/lib/python2.7/site-packages/rest_framework/generics.py" in get_serializer
111. return serializer_class(*args, **kwargs)
Exception Type: TypeError at /likes/api/1/
Exception Value: 'ListSerializer' object is not callable
错误在于它试图调用serializer_类,该类是ListSerializer的实例,而不是clas 这不应该:
serializer_class = VoteSerializer(queryset, many=True)
是这样的:
serializer_class = VoteSerializer
在尝试获取序列化程序
VoteSerializer
上的字段VoteSerializer
的值时,更改为您的建议后会触发此错误:AttributeError at/likes/api/1/get AttributeError。序列化程序字段的名称可能不正确,并且与VotedItem
实例上的任何属性或键都不匹配。原始异常文本为:“VotedItem”对象没有“投票对象”属性。谢谢你的帮助。上面的答案是正确的。你应该这样做,然后开始一个新问题;但是,为了使用多个查找字段mixin(),我需要显式设置many=True
(为什么)。这不可能吗?