class NoGroupByReport(ReportView):
    report_model = SalesTransaction
    report_title = _("No-Group-By Report")
    report_description = _("Produces a single summary row for the whole dataset with no grouping."
                           "Useful when you need a grand total over a date range rather than a breakdown.")
    date_field = "date"
    group_by = ""

    columns = [
        ComputationField.create(
            method=Sum,
            field="value",
            name="value__sum",
            verbose_name="Total sold $",
            is_summable=True,
        ),
    ]