我有多个ActiveRecord子类Item实例数组,我需要根据最早的事件循环打印.在这种情况下,我需要打印打印付款和维护日期如下:
Item A maintenance required in 5 days
Item B payment required in 6 days
Item A payment required in 7 days
Item B maintenance required in 8 days
我目前有两个查询用于查找维护和付款项目(非独占查询)以及类似以下内容的输出:
<%- item_p = nil -%> <%- item_m = nil -%> <%- loop do -%> <% item_p ||= @items_p.shift %> <% item_m ||= @items_m.shift %> <%- if item_p.nil? and item_m.nil? then break -%> <%- elsif item_p and (item_m.nil? or item_p.paymt < item_m.maint) then -%> <%= item_p.name %> payment required in ... <%- elsif item_m and (item_p.nil? or item_m.maint < item_p.paymt) then -%> <%= item_m.name %> maintenance required in ... <%- end -%> <%- end -%>
解决方法
这很快而且很脏(即没有优化):
# In your controller: @items = @items_p.map{ |item| {:item => item,:days => item.paymt,:description => "payment"} } @items += @items_m.map{ |item| {:item => item,:days => item.maint,:description => "maintenance"} } @items = @items.sort_by{ |item| item[:day] } # In your view: <% @items.each do |item| %> <%= item[:item].name %> <%= item[:description] %> required in <%= item[:days] %> days <% end %>