ruby中的数据表排序计算列

Question

我从计算值中对列进行排序时遇到问题。 这是问题所在：

我的数据：

def data
    vendors.map do |vendor|
      [
        vendor.image? ? "<img src='#{vendor.image.timeline_thumb.url}' >" : "NO IMAGE" ,
        vendor.name,
        vendor.orders_in_month(Time.zone.today).count,
        count1 = vendor.meals_in_month(Time.zone.today),
        count2 = vendor.meals_in_month(Time.zone.today-1.month),
        count3 = vendor.meals_in_month(Time.zone.today-2.month),
        count1+count2+count3
      ]
    end
  end

我想用count1对列进行排序 所以我写了这个：

def sort_column
    columns = [
      nil,
      "display_name", 
      nil, 
      HERE THE CODE TO SORT: I tried "count1" count1 or even the calculation, 
      nil, 
      nil, 
      nil
    ]
    columns[params[:iSortCol_0].to_i]
  end

和我的js：

aoColumns: [    
                false,
                { "asSorting": [ "asc","desc" ] },
                null,
                { "asSorting": [ "asc","desc" ] },
                null,
                null,
                null
            ]

有什么想法吗？ 谢谢！