class TimeSeriesWithoutGroupBy(ReportView):
    report_title = _("Time Series without a group by")
    report_description = _("A time series with no group_by: "
                           "the entire dataset becomes one summary row split into pattern (here monthly) columns.")
    report_model = SalesTransaction
    time_series_pattern = "monthly"
    date_field = "date"
    time_series_columns = [
        ComputationField.create(Sum, "value", verbose_name=_("Sales For ")),
    ]

    columns = [
        "__time_series__",
        ComputationField.create(Sum, "value", verbose_name=_("Total Sales")),
    ]

    chart_settings = [
        Chart(
            "Total Sales [Bar]",
            Chart.BAR,
            data_source=["sum__value"],
            title_source=["name"],
        ),
        Chart(
            "Total Sales [Pie]",
            Chart.PIE,
            data_source=["sum__value"],
            title_source=["name"],
        ),
    ]