尝试检索注册用户时出错

Question

我正在尝试通过CustomUser模型及其序列化程序注册新用户并显示它们。

这是我的模型：

class CustomUser(models.Model): 
user = models.OneToOneField(User) 
additional_field = models.CharField(max_length=30, default='', blank=True) 

我的串行器（从Django REST Framework Creating custom user）：

class CustomUserSerializer(serializers.ModelSerializer): 
additional_field = serializers.CharField(source='customuser.additional_field') 
class Meta: 
    model = User 
    fields = ('id', 'username', 'password', 'first_name', 'last_name', 'email', 'additional_field') 

def create(self, validated_data): 
    profile_data = validated_data.pop('customuser', None) 
    user = super(CustomUserSerializer, self).create(validated_data) 
    self.create_or_update_profile(user, profile_data) 
    return user 

def update(self, instance, validated_data): 
    profile_data = validated_data.pop('customuser', None) 
    self.create_or_update_profile(instance, profile_data) 
    return super(CustomUserSerializer, self).update(instance, validated_data) 

def create_or_update_profile(self, user, profile_data): 
    profile, created = CustomUser.objects.get_or_create(user=user, defaults=profile_data) 
    if not created and profile_data is not None: 
     super(CustomUserSerializer, self).update(profile, profile_data) 

的我的意见，分别显示和注册用户：

def get_all_users(request): 

all_friends = CustomUser.objects.all() 

serial = CustomUserSerializer(all_friends, many=True) 
json_data = JSONRenderer().render(serial.data) 

return HttpResponse(json_data, content_type='application/json') 


@api_view(['POST']) 
def register_new_user(request): 

if request.method == 'POST': 
    print('POST request !') 

    print(request.data) 
    serializer = CustomUserSerializer(data=request.data) 

    if serializer.is_valid(): 

     serializer.save() 
     print('save friend!') 
     return HttpResponse(status.HTTP_201_CREATED) 

    else: 
     print(serializer.errors) 
     return HttpResponse(status.HTTP_403_FORBIDDEN) 

虽然我可以使用以下代码注册用户：

import requests 
import json 

json_data = {'username': 'mylogin99', 'password': 'mypassword', 'email': 'mymail99@wanadoo.fr', 'additional_field' : 'myaddfield'} 
r = requests.post('http://127.0.0.1:8000/register_new_user', json=json_data) 

我无法显示注册用户，我得到了以下错误：

AttributeError at /getAllUsers 
Got AttributeError when attempting to get a value for field `username` on serializer `CustomUserSerializer`. 
The serializer field might be named incorrectly and not match any attribute or key on the `CustomUser` instance. 
Original exception text was: 'CustomUser' object has no attribute 'username'. 

我不明白为什么username字段不指User模型username领域。

Answer 1

我能想出的最好办法是实现在CustomUser模型as_json方法：

def as_json(self): 
    return dict(
     id=self.user.id, username=self.user.username, 
     password=self.user.password, email=self.user.email, 
     additional_field=self.additional_field) 

因此，检索所有的注册用户，我已经修改了get_all_user方法：

@api_view(['GET']) 
def get_all_users(request): 

    # retrieve all CustomUser objects 
    all_friends = CustomUser.objects.all() 
    lst = [friend.as_json() for friend in all_friends] 
    json_data = JSONRenderer().render(lst) 

    return HttpResponse(json_data, content_type='application/json')