Django REST Framework: adding additional field to ModelSerializer

Question

I want to serialize a model, but want to include an additional field that requires doing some database lookups on the model instance to be serialized:

class          


        

Answer 1

As Chemical Programer said in this comment, in latest DRF you can just do it like this:

class FooSerializer(serializers.ModelSerializer):
    extra_field = serializers.SerializerMethodField()

    def get_extra_field(self, foo_instance):
        return foo_instance.a + foo_instance.b

    class Meta:
        model = Foo
        fields = ('extra_field', ...)

DRF docs source