I am saving a model like this

   if serializer.is_valid():
       message = serializer.save(version_info='55')

and I am passing a parameter called version_info and inside my serializer I have the following code

class MessageSerializer(serilizer.Serializer):
    def create(self, validated_data, **kwargs):
        message = Message.objects.create(**validated_data)
        return message

version_info parameter is inside validated_data dictionary but I want to pass this version_info to save method of my Message model which I have customize it to do some extra work while a message being saved but it gives this error: TypeError: Message() got an unexpected keyword argument 'version_info' how can I pass the version_info parameter to save method of my model?

CodePudding user response：

Using the context

You can add it to the context when you construct the serializer, so:

serializer = MessageSerializer(data=data, context={'version_info': 55})
if serializer.is_valid():
    message = serializer.save()

and in the serializer you can access the context with:

class MessageSerializer(serilizer.Serializer):
    
    def create(self, validated_data, **kwargs):
        version_info = self.context['version_info']
        # do something …
        message = Message.objects.create(**validated_data)
        return message

Popping the element from the validated_data

Another option where you still call .save(version_info=55) is popping the data from the validated data with:

class MessageSerializer(serilizer.Serializer):
    
    def create(self, validated_data, **kwargs):
        version_info = validated_data.pop('version_info', None)
        # do something …
        message = Message.objects.create(**validated_data)
        return message

this will return None for the version_info if you did not call it with .save(version_info=55).