@invoices_1_week = Invoice.order("due_date DESC").where("status != 'paid' AND due_date >= ? AND due_date < ?",Date.today,1.week.from_now)

发票模型具有总属性.如何在@ invoice_1_week集合中获得总计的总和？

我知道我可以在这样的视图中做到这一点……

<% week_1_total = 0 %>
<% @invoices_1_week.each do |invoice| %>
  <% week_1_total = week_1_total + invoice.total %>
<% end %>
<%= week_1_total %>

但我想知道是否有更多的Railsy方式.