This question asks how to add an additional field to ModelSerializer.
This answer says you can add a SerializerMethodField. But, how to implement a method field if the value of the call depends on some other parameter, like the request?
2 Answers
You can use the serializers context (see docs) for this
class MySerializer(serializers.Serializer):
my_field = serializers.SerializerMethodField()
def get_my_field(self, obj):
request = self.context['request']
# do something with request and obj
Then when you initialize the serializer be sure to pass in the request object in the context e.g:
serializer = MySerializer(myObject, context={'request': request})
Comments
class MySerializer(serializers.Serializer): my_field = serializers.SerializerMethodField()
def to_represention(self,instance):
data=super().to_representation(instance)
data["user"]="new filed"
return data
SerializerMethodFieldis a read-only field. So it is used only during serialization. You can use extra context to pass in the request to the serializer and use it there.