将不在模型中的字段添加到 Django REST 框架中的序列化程序 [英] Adding field that isn't in model to serializer in Django REST framework
本文介绍了将不在模型中的字段添加到 Django REST 框架中的序列化程序的处理方法,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
我有一个模型评论,创建时可能会也可能不会创建新用户.因此,我的 API 在创建新评论时需要密码字段.这是我的评论模型:
I have a model Comment that when created may or may not create a new user. For this reason, my API requires a password field when creating a new comment. Here is my Comment model:
class Comment(models.Model):
commenter = models.ManyToManyField(Commenter)
email = models.EmailField(max_length=100)
author = models.CharField(max_length=100)
url = models.URLField(max_length=200)
content = models.TextField(blank=True, null=True)
ip = models.IPAddressField(max_length=45)
date = models.DateTimeField(default=datetime.now)
post_title = models.CharField(max_length=200)
post_url = models.URLField(max_length=200)
rating = models.IntegerField(max_length=10, default=0)
这是我的 API 视图:
Here is my API view:
class CommentNewView(CreateAPIView):
model = Comment
serializer_class = CommentCreateSerializer
这是我的序列化程序:
class CommentCreateSerializer(serializers.ModelSerializer):
commenter_pw = serializers.CharField(max_length=32, required=False)
class Meta:
model = Comment
fields = ('email', 'author', 'url', 'content', 'ip', 'post_title', 'post_url', 'commenter_pw')
这是我得到的错误:
Environment:
Request Method: POST
Request URL: http://127.0.0.1:8000/api/comment/create/
Django Version: 1.5.2
Python Version: 2.7.2
Installed Applications:
('commentflow.apps.dashboard',
'commentflow.apps.commenter',
'commentflow.apps.comment',
'rest_framework',
'rest_framework.authtoken',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.sites',
'django.contrib.messages',
'django.contrib.staticfiles',
'django.contrib.admin',
'django.contrib.admindocs')
Installed Middleware:
('django.middleware.common.CommonMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.locale.LocaleMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware')
Traceback:
File "/Users/tlovett1/.virtualenvs/commentflow/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
115. response = callback(request, *callback_args, **callback_kwargs)
File "/Users/tlovett1/.virtualenvs/commentflow/lib/python2.7/site-packages/django/views/generic/base.py" in view
68. return self.dispatch(request, *args, **kwargs)
File "/Users/tlovett1/.virtualenvs/commentflow/lib/python2.7/site-packages/django/views/decorators/csrf.py" in wrapped_view
77. return view_func(*args, **kwargs)
File "/Users/tlovett1/.virtualenvs/commentflow/lib/python2.7/site-packages/rest_framework/views.py" in dispatch
327. response = self.handle_exception(exc)
File "/Users/tlovett1/.virtualenvs/commentflow/lib/python2.7/site-packages/rest_framework/views.py" in dispatch
324. response = handler(request, *args, **kwargs)
File "/Users/tlovett1/.virtualenvs/commentflow/lib/python2.7/site-packages/rest_framework/generics.py" in post
372. return self.create(request, *args, **kwargs)
File "/Users/tlovett1/.virtualenvs/commentflow/lib/python2.7/site-packages/rest_framework/mixins.py" in create
50. if serializer.is_valid():
File "/Users/tlovett1/.virtualenvs/commentflow/lib/python2.7/site-packages/rest_framework/serializers.py" in is_valid
479. return not self.errors
File "/Users/tlovett1/.virtualenvs/commentflow/lib/python2.7/site-packages/rest_framework/serializers.py" in errors
471. ret = self.from_native(data, files)
File "/Users/tlovett1/.virtualenvs/commentflow/lib/python2.7/site-packages/rest_framework/serializers.py" in from_native
867. instance = super(ModelSerializer, self).from_native(data, files)
File "/Users/tlovett1/.virtualenvs/commentflow/lib/python2.7/site-packages/rest_framework/serializers.py" in from_native
324. return self.restore_object(attrs, instance=getattr(self, 'object', None))
File "/Users/tlovett1/.virtualenvs/commentflow/lib/python2.7/site-packages/rest_framework/serializers.py" in restore_object
852. instance = self.opts.model(**attrs)
File "/Users/tlovett1/.virtualenvs/commentflow/lib/python2.7/site-packages/django/db/models/base.py" in __init__
415. raise TypeError("'%s' is an invalid keyword argument for this function" % list(kwargs)[0])
Exception Type: TypeError at /api/comment/create/
Exception Value: 'commenter_pw' is an invalid keyword argument for this function
推荐答案
如果有人好奇,解决方案是覆盖 restore_object 方法,并在注释对象实例化后添加额外的实例变量:
If anyone is curious, the solution is to override the restore_object method and add the extra instance variable to the comment object after it has been instantiated:
def restore_object(self, attrs, instance=None):
if instance is not None:
instance.email = attrs.get('email', instance.email)
instance.author = attrs.get('author', instance.author)
instance.url = attrs.get('url', instance.url)
instance.content = attrs.get('content', instance.content)
instance.ip = attrs.get('ip', instance.ip)
instance.post_title = attrs.get('post_title', instance.post_title)
instance.post_url = attrs.get('post_url', instance.post_url)
return instance
commenter_pw = attrs.get('commenter_pw')
del attrs['commenter_pw']
comment = Comment(**attrs)
comment.commenter_password = commenter_pw
return comment
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