Method to_representation

rest_framework/fields.py:1597–1612

(self, value)

        return data

    def to_representation(self, value):
        if not value:
            return None

        use_url = getattr(self, 'use_url', api_settings.UPLOADED_FILES_USE_URL)
        if use_url:
            try:
                url = value.url
            except AttributeError:
                return None
            request = self.context.get('request', None)
            if request is not None:
                return request.build_absolute_uri(url)
            return url

        return value.name


class ImageField(FileField):