python – 在Django REST框架中添加不在模型中的序列化程序的字段

概述我有一个模型注释,创建时可能会创建一个新用户,也可能不会创建新的用户因此,在创建新注释时,我的API需要一个密码字段.这是我的评论模特： class Comment(models.Model): commenter = models.ManyToManyField(Commenter) email = models.EmailField(max_length=100) au 我有一个模型注释,创建时可能会创建一个新用户,也可能不会创建新的用户因此,在创建新注释时,我的API需要一个密码字段.这是我的评论模特：

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：

class CommentNewVIEw(CreateAPIVIEw):    model = Comment    serializer_class = CommentCreateSerializer

这是我的串行器：

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: POSTRequest URL: http://127.0.0.1:8000/API/comment/create/Django Version: 1.5.2Python Version: 2.7.2Installed 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,**kwargs)file "/Users/tlovett1/.virtualenvs/commentflow/lib/python2.7/site-packages/rest_framework/generics.py" in post  372.         return self.create(request,**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.errorsfile "/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

解决方法 如果有任何人好奇,解决方案是覆盖restore_object方法,并在注释对象实例化之后添加额外的实例变量：

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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