Returns the generated file content.
        :param request: The request being processed.
        :param queryset: The model class being processed.
        :return: The report content (usually expressed in raw bytes but could be unicode as well).

def get_attachment_content(self, request, queryset):
        """
        Returns the generated file content.
        :param request: The request being processed.
        :param queryset: The model class being processed.
        :return: The report content (usually expressed in raw bytes but could be unicode as well).
        """

        return self.dump_report_content(request, self.get_report_data_rows(request, queryset))