Django Rest Framework ImageFileField Serializer

ImageFileFieldSerializer.py

'''
When ImageFields are serialized with Djang Rest Framework you only get 
    the URN of the file. So I made this serializer which adds the rest
    of the URI.
'''
class ImageFileFieldSerializer(serializers.WritableField):
    def __init__(self, *args, **kwargs):
        super(ImageFileFieldSerializer, self).__init__(*args, **kwargs)

    def to_native(self, obj):
        request = self.context.get('request', None)
        full_uri = "http://" + request.get_host() + "/" + obj.url
        return full_uri