Django的IntegrityError：（1048， 「列user_ID的」不能爲空「）

Question

這是我的models.py

class Cfituser(models.Model): 
user = models.OneToOneField(User) 
socialid = models.IntegerField(null=True) 
accesstoken = models.CharField(max_length=255L, null = True) 
class Meta: 
    db_table = 'CfitUser' 
def __str__(self): 
     return "%s's profile" % self.user 

@receiver(post_save, sender=User) 
def create_cfituser(sender, instance, created, **kwargs): 
    if created: 
     Cfituser.objects.get_or_create(user=instance) 

這是我的views.py

@api_view(['GET', 'POST']) 
def users_create(request, format = None): 
""" 
List all users, or create a new user. 
""" 
if request.method == 'GET': 
    cfituser = Cfituser.objects.all() 
    serializer = CfituserSerializer(cfituser, many=True) 
    return Response(serializer.data) 

elif request.method == 'POST': 
    serializer = CfituserSerializer(data=request.DATA) 
    if serializer.is_valid(): 
      print serializer.data 
      user = User.objects.create_user(username = serializer.data['socialid']) 
      cfituser = Cfituser.objects.get(user = user) 
      cfituser.accesstoken = serializer.data['accesstoken'] 
      cfituser.socialid = serializer.data['socialid'] 
      cfituser.save() 
      serializer.save() 
      return Response(serializer.data, status=status.HTTP_201_CREATED) 
    else: 
     return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST) 

每當有HTTP發佈請求後，我的數據庫表格按預期填充，但此錯誤不斷彈出。我嘗試了幾乎所有可用的解決方案，但我堅持這一點。

我試過user = models.OneToOneField(User, null = True)，但是這導致我的數據庫表中有兩個條目，一個是user_id = NULL，另一個是user_id = actualvalue。

有關如何解決此問題的任何建議？

Answer 1

保存在默認情況下承諾的進入到數據庫中，以防止這種情況，通過對commit=Falsesave()，然後做你的自定義設置。

serializer = serializer.save(commit=False) 

user, created = User.objects.get_or_create(username = serializer.socialid) 
cfituser, created = Cfituser.objects.get_or_create(user = user) 
# cfituser.user = user This line is unnecessary 
cfituser.accesstoken = serializer.accesstoken 
cfituser.socialid = serializer.socialid 

cfituser.save() 
serializer.save() 

您也在重複您的努力，因爲您的信號也會嘗試創建用戶。如果您使用的是django 1.5，請使用customized user model;和社會登記/ oauth，請使用django-social-auth。

Answer 2

OneToOneField意味着，在Cfituser.user關係的反面將直接返回一個對象（user.cfituser給出Cfituser）。 SO Cfituser.user在表格中必須是唯一的（只有一個）。

class Cfituser(models.Model): 
    user = models.OneToOneField(User) 
    socialid = models.IntegerField(null=True) 
    accesstoken = models.CharField(max_length=255L, null = True) 
    def __unicode__(self): 
     return "%s's profile" % self.user.username 


def users_create(request, format = None): 
""" 
List all users, or create a new user. 
""" 
    if request.method == 'GET': 
     cfituser = Cfituser.objects.all() 
     serializer = CfituserSerializer(cfituser, many=True) 
     return Response(serializer.data) 
    elif request.method == 'POST': 
     serializer = CfituserSerializer(data=request.DATA) 
     if serializer.is_valid(): 
      print serializer.data 
      user = User.objects.create_user(username = serializer.data['socialid'])     
      Cfituser(user = user,accesstoken = serializer.data['accesstoken'],socialid = serializer.data['socialid']).save() 
      serializer.save() 
      return Response(serializer.data, status=status.HTTP_201_CREATED) 
    else: 
     return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)