fab-manager/app/views/exports/users_reservations.xlsx.axlsx

wb = xlsx_package.workbook

header = wb.styles.add_style :b => true, :bg_color => Stylesheet.primary.upcase.gsub('#', 'FF'), :fg_color => 'FFFFFFFF'
date = wb.styles.add_style :format_code => Rails.application.secrets.excel_date_format

wb.add_worksheet(name: t('export_reservations.reservations')) do |sheet|

  ## data table
  # heading labels
  columns = [t('export_reservations.customer_id'), t('export_reservations.customer'), t('export_reservations.email'),
             t('export_reservations.reservation_date'), t('export_reservations.reservation_type'), t('export_reservations.reservation_object'),
             t('export_reservations.slots_number_hours_tickets'), t('export_reservations.payment_method')]
  sheet.add_row columns, :style => header

  # data rows
  @reservations.each do |resrv|
    data = [
        resrv.user.id,
        resrv.user.profile.full_name,
        resrv.user.email,
        resrv.created_at.to_date,
        resrv.reservable_type,
        (resrv.reservable.nil? ? '' : resrv.reservable.name),
        (resrv.reservable_type == 'Event') ? resrv.total_booked_seats: resrv.slots.count,
        (resrv.stp_invoice_id.nil?)? t('export_reservations.local_payment') : t('export_reservations.online_payment')
    ]
    styles = [nil, nil, nil, date, nil, nil, nil, nil]
    types = [:integer, :string, :string, :date, :string, :string, :integer, :string]

    sheet.add_row data, :style =>  styles, :types => types
  end
end