Django custom serializer how to input ID/PK -

i trying make custom serializer work. can't use model serializer since saving data multiple models. here code:

class rushserializer(serializers.serializer):         keyword = serializers.integerfield(read_only=true)     url = serializers.urlfield()         def save(self):         keyword = self.validated_data['keyword']         url = self.validated_data['url']         url1.objects.create(keyword=keyword, url=url) 

and input data this:

nov = {'url': 'https://domain.com/'}              nov['keyword'] = id  serializer = rushserializer(data=nov) 

it returns me error:

keyerror @ /admin/keywords/kw/add/

'keyword'

here model itself:

class url1(models.model):      keyword = models.foreignkey(kw)     url = models.urlfield() 

what wrong code? tried pretty anything here can't seem make work.

edit: clarify, works if model serializer , this:

class meta:     model = url1            fields = ('keyword', 'url')   

so problem isn't in input 100% in serializer itself.

• if keyword without read_only error:

valueerror @ /admin/keywords/kw/add/ cannot assign "104": "url1.keyword" must "kw" instance.