Activerecord：找到表

Question

{ 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]}

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

Answer 1

您正在寻找offset。

另请注意，未将order传递给查询并不能保证查询将返回主键排序的实例。所以最好传递一个明确的order。

Opportunity.order(:id).limit(1).offset(2)