Question

I have a simple rails 3 blog app where posts have many comments and comments belong to a post.

I want to create a scope that will fetch all posts that have more than 5 comments.
What’s the best way of doing this without a counter cache column.

Answer 1

Like this, perhaps?

Post.select('posts.*, count(comments.id) as comment_count').
  joins(:comments).
  group('posts.id').
  having('comment_count > 5')