class ProductSalesPerClientCrosstab(ReportView):
    report_title = _("Product Sales Per Client Crosstab")
    report_description = _("A crosstab matrix with products as rows and clients as columns. "
                           "The remainder column (crosstab_compute_remainder=True) "
                           "captures sales not tied to a said clients.")
    report_model = SalesTransaction
    date_field = "date"
    group_by = "product"
    crosstab_field = "client"

    crosstab_columns = [
        SumValueComputationField,
    ]

    crosstab_compute_remainder = True  # Add a extra column to the report, capturing the value all other clients

    columns = [
        "name",
        "sku",  # a field that exists on the `Product` model
        "__crosstab__",
        SumValueComputationField,
    ]