下面是我的模型Windows 10，postgress 12，django 3.0.7，python 3.7.6class User(AbstractBaseUser, PermissionsMixin):    email = models.CharField(max_length=30)    password = models.CharField(max_length=4000)    first_name = models.CharField(default='', max_length=15)    last_name = models.CharField(default='', max_length=15)    login = models.CharField(max_length=15)    age = models.IntegerField()    street = models.CharField(blank=True, max_length=255)    city = models.CharField(blank=True, max_length=255)    zip = models.CharField(blank=True, max_length=10)    role = models.CharField(default='', max_length=10)    USERNAME_FIELD = 'email'當(dāng)我發(fā)出發(fā)布請(qǐng)求時(shí)，出現(xiàn)以下錯(cuò)誤File "C:\Users\Akila\Anaconda3\lib\site-packages\django\db\backends\utils.py", line 86, in _execute    return self.cursor.execute(sql, params)psycopg2.errors.NotNullViolation: null value in column "id_id" violates not-null constraintDETAIL:  Failing row contains (null, default).這是被調(diào)用的我的注冊(cè)視圖。@靜態(tài)方法@api_view(['POST'])def sign_up(request):    logging.debug("Trying to register a new user")    data = common_methods.get_request_data(request)    print(data)    if check_user_exists(data['email']):        return JsonResponse({'message': 'User with this email already exists'},status=status.HTTP_400_BAD_REQUEST)    print(data['email'])    create_user(data['email'], data['password'], data['fullName'])    refresh = CustomTokenObtainPairSerializer.get_token(        get_user_by_email(email=data['email']))    return JsonResponse({'token': {        'access_token': str(refresh.access_token),        'expires_in': str(refresh.access_token.lifetime.seconds),        'refresh_token': str(refresh)    }})