CODEWITHSUNDEEP
rubyruby-on-rails-4activerecord
Javier
Javier

Reputation: 249

Create array of active record association Rails4

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.

Upvotes: 0

Views: 95

Answers (2)

loving marshmallow
loving marshmallow

Reputation: 331

Can you try:

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

Upvotes: 0

Abdoo Dev
Abdoo Dev

Reputation: 1276

You can try this

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

Upvotes: 1

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