Create array of active record association Rails4

Question

I have posts that are associated with comments. I want to create an array of comments from the first 10 posts. I had the following method but to_a seems to not work anymore? Also will this give an N+1 query? should I do includes(:comments) to preload them?

def 10_posts_comments
  posts = Post.limit(10)

  posts.flat_map do |post|
    post.comments.to_a
  end

end

I'm still new at this so any help appreciated.

Abdoo Dev · Accepted Answer · 2016-04-08 23:15:06Z

1

You can try this

def 10_posts_comments     
  Comment.where(post: Post.limit(10)).to_a
end

answered Apr 8, 2016 at 23:15

Abdoo Dev

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Comments

noumena ashitaka hundimägi-mei · Accepted Answer · 2016-04-09 03:26:35Z

0

Can you try:

def latest_comments
  Post.includes(:comments).last(10).map(&:comments).flatten
end

answered Apr 9, 2016 at 3:26

noumena ashitaka hundimägi-mei

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1 Comment

noumena ashitaka hundimägi-mei Over a year ago

You can use your method, I just changed the name since it bothered me the leading 10. Sorry.

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