links.rb

def ticket_issued
  case
  when avia?
    "#{user_name} выписал(а) авиабилет #{ticket_number}"
  when railway?
    "#{user_name} выписал(а) ж/д билет #{ticket_number}"
  when bus?
    "#{user_name} выписал(а) автобусный билет #{ticket_number}"
  end
end

def ticket_number
  case
  when avia?
    h.link_to (avia_ticket.number || avia_ticket.id),
              h.postsale_avia_path(general_company_id, ticket_id: ticket_id),
              class: 'tickets-number',
              data: { number: avia_ticket.number }
  when railway?
    h.link_to (railway_ticket.code || railway_ticket.id),
              h.postsale_railway_path(general_company_id, ticket_id: ticket_id),
              class: 'tickets-number',
              data: { number: railway_ticket.code }
  when bus?
    h.link_to (bus_ticket.ticket_number || bus_ticket.id),
              h.postsale_bus_path(general_company_id, ticket_id: ticket_id),
              class: 'tickets-number',
              data: { number: bus_ticket.ticket_number }
  end
end