ruby-on-rails - ActiveRecord:查找表中的第n行

{ topic: "Foo", opportunity: Opportunity.limit(15)[0] },
{ topic: "Foo", opportunity: Opportunity.limit(15)[2] },
{ topic: "Foo", opportunity: Opportunity.limit(15)[7] },
{ topic: "Foo", opportunity: Opportunity.limit(15)[9] },
{ topic: "Foo", opportunity: Opportunity.limit(15)[11]}

活动记录是否提供任何便利功能，而不是执行Opportunity.limit(15)[n]？

最佳答案

您正在查找offset。
还要注意，不向查询传递order并不保证查询将返回按主键排序的实例。所以最好传递一个显式的order。
Opportunity.order(:id).limit(1).offset(2)