在我的rails代码中,我需要基于记录的日期和记录已收到的投票的组合在表上运行查询.我像在rails中那样完成它：
if params[:sort_by] == "default"
objs1 = class_name.where("created_at between '#{Date.today - 7}' and '#{Date.today}' and net_Votes > 0").order("net_Votes DESC")
objs2 = class_name.where("created_at between '#{Date.today - 30}' and '#{Date.today - 7}' and net_Votes > 0").order("net_Votes DESC")
objs3 = class_name.where("created_at between '#{Date.today - 90}' and '#{Date.today - 30}' and net_Votes > 0").order("net_Votes DESC")
objs4 = class_name.where("created_at < '#{Date.today - 90}' and net_Votes > 0").order("net_Votes DESC")
objs = objs1 + objs2 + objs3 + objs4
除了效率,我不能对组合查询结果使用分页,更不用说代码很丑陋了.正确的方法是什么？
提前致谢.
解决方法:
将命令用于排序逻辑,而不是在以下位置：
order_by_sql = <<-sql
CASE WHEN created_at between '#{Date.today - 7}' and '#{Date.today}' THEN 1
WHEN created_at between '#{Date.today - 30}' and '#{Date.today - 7}' THEN 2
WHEN created_at between '#{Date.today - 90}' and '#{Date.today - 30}' THEN 3
ELSE 4
END
sql
objs = class_name.where('net_Votes > 0').order(order_by_sql)
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