轨道上的 Ruby：等效轨道查询以获取此信息->

Question

How can i get this result from ruby on rails query?

 select post_id, count(post_id)
 from comments
 group by post_id
 order by count(post_id) desc
 limit 5

Answer 1

Active Relation is amazing. It's just this:

Comment.select("post_id, COUNT(post_id)").group("post_id").order("COUNT(post_id) DESC").limit(5).all

You should look more into it, it really is great.