Ruby rails季度循环

Question

我有一个银行应用程序，显示一个语句表。目前，表格下面的代码有一列年份，旁边是每个月的列，旁边是每个银行帐户的列。我希望改变它，以便每年显示四个季度。我该怎么做呢？

%table
  %thead
    %tr
      %th.year(rowspan=2) Year
      %th.accounts{colspan: @customer.accounts.size} Accounts
    %tr
      - fetch_cu_accounts(@customer.id).each do |account|
        %th= account.name
  - @today.year.downto(@today.year - 3) do |year|
    %tbody
      - x = (@today.year == year) ? @today.month : 12
      - x.downto(1) do |month|
        %tr
          - if month == x
            %td{rowspan: x}= year
          %td
          - fetch_cu_accounts(@customer.id).each do |account|
            %td
              - stmt = account.statement(year, month)
              = link_to 'View', url(:statements, :show, id: stmt.to_s)
              = link_to image_tag('/icons/document-pdf.png', alt: 'Download PDF'), url(:statements, :show, id: stmt, format: :pdf), class: :pdf