Django-Rest-Framework Serializer 验证数据返回无

Question

我无法在我的 API 的 Serializer 的 validate() 函数中获取数据。我正在使用 django AbstractUser 模型

Django = "^3.1.3"
djangorestframework = "^3.12.2"

我的 serializers.py：

class ChangePasswordSerializer(serializers.Serializer):
    old_password = serializers.CharField(max_length=255, required=True)
    new_password = serializers.CharField(max_length=255, required=True, write_only=True)
    new_password_confirm = serializers.CharField(max_length=255, required=True, write_only=True)

    def validate_old_password(self, value):
        if not self.context['user'].check_password(value): # got data
            raise serializers.ValidationError("Incorrect Old Password") 
    
    def validate_new_password(self, value):
        try:
             # validate the password and catch the exception
            validators.validate_password(password=value) # got data

         # the exception raised here is different than serializers.ValidationError
        except exceptions.ValidationError as e:
            raise serializers.ValidationError(list(e)) 
    
    def validate_new_password_confirm(self, value):
        try:
             # validate the password and catch the exception
            validators.validate_password(password=value) # got data

         # the exception raised here is different than serializers.ValidationError
        except exceptions.ValidationError as e:
            raise serializers.ValidationError(list(e)) 
    
    def validate(self, data):
        if data['new_password'] != data['new_password_confirm']: # both return None
            raise serializers.ValidationError({'message': ["Your password and confirmation password do not match."]})
        
        return data

views.py：

class change_password(APIView):

    def post(self, request):
        received_json_data=request.data
        user = request.user
        serializer = ChangePasswordSerializer(data=received_json_data, context={'user': user})
        if serializer.is_valid():
            user.set_password(received_json_data['new_password']) # got new_password
            return JsonResponse({
                'message': 'Password changed.'
            }, status=200)
        else:
            return JsonResponse({'message':serializer.errors}, status=400)

问题在于 validate(self, data) 数据当前返回为 OrderedDict([('old_password', None), ('new_password', None), ('new_password_confirm', None)]) 所以它跳过了自定义验证，但在其他验证方法 validate_old_password 、validate_new_password 和 validate_new_password_confirm打印出来

我很困惑为什么会这样

Answer 1

您始终必须在验证方法中返回值。

而不是这个不返回值：

def validate_old_password(self, value):
    if not self.context['user'].check_password(value): # got data
        raise serializers.ValidationError("Incorrect Old Password") 

你必须这样写：

def validate_old_password(self, value):
    if not self.context['user'].check_password(value): # got data
        raise serializers.ValidationError("Incorrect Old Password")

    return value 

这也是validate方法没有收到数据的原因，因为各个字段的验证方法首先运行。