本文介绍了'ListSerializer'对象不可调用的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在为具有content_type对象的投票应用程序实现Django-Rest框架。我尝试使用用于serializers.py的 。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，感谢您的帮助！
views.py：
class vote_detail（generics.RetrieveUpdateDestroyAPIView）：
queryset = VotedItem.objects.all（）
serializer_class = VoteSerializer（queryset，many = True）
serializers.py：
从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）：
一个`VotedItem`串行器与一个`GenericRelatedField`映射所有可能的
模型到它们各自的序列化器
V oted_object = GenericRelatedField（{
Post：PostSerializer（），
}）
class Meta：
model = VotedItem
fields =（'user' 'voted_object'）
和models.py：
从__future__导入unicode_literals
from datetime import datetime
from django.utils.encoding import python_2_unicode_compatible
from django .db导入模型
from django.contrib.contenttypes.fields import GenericForeignKey，GenericRelation
from django.contrib.contenttypes.models import ContentType
from django.core.urlresolvers import reverse
从django.utils导入时区
从django.contrib.auth.models import来自social_count.managers的用户
导入VoteManager
SCORES =（
（+1， +1'），
（-1，'-1'），
）
@ python_2_unicode_compatible
class VotedItem（models.Model）：
对对象的投票b一个用户
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 ='票'
＃每个对象每个用户一个
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：
追溯：
文件/home/henry/newpine/src/env/local/lib/python2.7/site-packages/django/core/ get_response
149. response = self.process_exception_by_middleware（e，request）
文件/ home / henry / newpine / src / env / local / lib / python2 .7 / site-packages / django / core / handlers / base.pyin get_response
147. response = wrapped_callback（request，* callback_args，** callback_kwargs）
文件/ home /henry/newpine/src/env/local/lib/python2.7/site-packages/django/views/decorators/csrf.py在wrapped_view
58. return view_func（* args，** kwargs）
文件/home/henry/newpine/src/env/local/lib/python2.7/site-packages/django/views/generic/base.py在视图
68。 return self.dispatch（request，* args，** kwargs）
文件/home/henry/newpine/src/env/local/lib/python2.7/site-packages/rest_framework/views .py在调度
466. response = self.handle_exception（exc）
文件/home/henry/newpine/src/env/local/lib/python2.7/site- package / rest_framework / views.py在dispatch
463. response = handler（request，* args，** kwargs）
文件/ home / henry / newpine / src / env /本地/ lib / python2.7 / site-packages / rest_framework / generics.pyin get
286. return self.retrieve（request，* args，** kwargs）
文件 /home/henry/newpine/src/env/local/lib/python2.7/site-packages/rest_framework/mixins.py检索
57. serializer = self.get_serializer（instance）
文件/home/henry/newpine/src/env/local/lib/python2.7/site-packages/rest_framework/generics.pyin get_serializer
111. return serializer_class（* args，** kwargs）
异常类型：类型/ likes / api / 1 /
异常值：'ListSerializer'对象不可调用
解决方案
错误是试图调用serializer_class，它是ListSerializer的一个实例，而不是clas。
不应该这样：
serializer_class = VoteSerializer（queryset，many = True）
成为：
serializer_class = VoteSerializer
I am trying to implement Django-Rest framework for a voting application with content_type objects. I tried using the rest-framework-generic-relations for serializers.py. It seems to me that the error might be within serializer.py / views.py, but I am new to this framework and would appreciate your help!
views.py:
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')
and 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
When I visit www.mypage.com/likes/api/1/ I get an error message:
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
解决方案
The error is that it's trying to call the serializer_class, which is an instance of ListSerializer, instead of a clas.
Shouldn't this:
serializer_class = VoteSerializer(queryset, many=True)
Be that:
serializer_class = VoteSerializer
这篇关于'ListSerializer'对象不可调用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！