Soichi Ishida wrote in post #1112146:
> Rails 4.0.0
> Of course, I can loop through all elements like
>
>   Info.all.each do | i |
>      if i == ... then
>          Info.create(... => i)
>      end
>   end
>
> But it seems inefficient.
>
> Is there better ways or gems that do the job I am looking for?
>
> soichi

Not sure I understand fully your problem.

Maybe use find_in_batches ?
http://api.rubyonrails.org/classes/ActiveRecord/Batches.html

or find_and_create_by_column_name ?
http://api.rubyonrails.org/classes/ActiveRecord/Base.html

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