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/gist:304ac2b5cb9566774a2b

Created August 28, 2014 18:31
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gistfile1.rb
Topic.record_timestamps=false
Topic.includes(:replies).find_each do |t|
last_reply = replies.sort_by(&:created_at).last
t.replied_at = last_reply ? last_reply.created_at : t.created_at
t.save
end
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