将SQL查询转换为Rails ORM查询

Question

什么是SQL查询的等效Rails ORM命令？

select next_refresh_time from yoddle_jobs where account_key = "YzI5ZDUyNWY5NmYwNWFiNjJiYmE1YTk4Y2VkYTBjYTZmOGM5ZTI0NzE2MzU2MzAwMmU2OWU2MzNiYmQ2YTZhMA==" order by id DESC LIMIT 1;

Answer 1

等效查询

YoddleJob.select(:next_refresh_time).where(:account_key => "YzI5ZDUyNWY5NmYwNWFiNjJiYmE1YTk4Y2VkYTBjYTZmOGM5ZTI0NzE2MzU2MzAwMmU2OWU2MzNiYmQ‌​2YTZhMA==").last(1)

Answer 2

你可以试试这个

YoddleJob.select(:next_refresh_time).where(account_key: "YzI5ZDUyNWY5NmYwNWFiNjJiYmE1YTk4Y2VkYTBjYTZmOGM5ZTI0NzE2MzU2MzAwMmU2OWU2MzNiYmQ‌​2YTZhMA==").order("id DESC").first

Answer 3

这应该是这样的

YoddleJob.where(:account_key => "YzI5ZDUyNWY5NmYwNWFiNjJiYmE1YTk4Y2VkYTBjYTZmOGM5ZTI0NzE2MzU2MzAwMmU2OWU2MzNiYmQ2YTZhMA==").select('next_refresh_time').order("id desc").limit(1)

Answer 4

YoddleJob.where(account_key: "YzI5ZDUyNWY5NmYwNWFiNjJiYmE1YTk4Y2VkYTBjYTZmOGM5ZTI0NzE2MzU2MzAwMmU2OWU2MzNiYmQ‌​2YTZhMA==").select('next_refresh_time').last(1)