ruby - rails, best way to get random nested record -

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I have a post model and a comment model; There are many comments in the post, and comments belong to a post

In my post controller, I want to select a random comment, and want to display the date of the comment.

In my post controller, I have: 

  @posts = Post.where (: public_flag = & gt; true) .dr ('created_at DESC')

After this I'm stuck a bit. Should I get a comment from this idea? Or are there any other queries from the controller to get the comments? Then, how do I choose a random comment after a comment?

Thanks in advance! Appreciate your help.

Answer to your question Application: 

  Offset = rand (@ Post.comments.count) # rails4rand_record = @ post.comments.offset (offset) First # Rail 3 rand_record = @ post.comments.first (: offset = & gt; offset)

I hope it helps


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