get_data.rb

require 'open-uri'

# SSL_VERIFY_NONE because my system has forgotten how to SSL. You probably want to remove this.
file = open('https://data.stackexchange.com/interpersonal/csv/1136923', ssl_verify_mode: OpenSSL::SSL::VERIFY_NONE)
data = file.read
titles = data.split("\n")[1...-1].map { |l| l.gsub('"', '').strip }

titles.in_groups_of(5).map(&:compact).each_with_index do |g, i|
  post = Post.create title: "HNQ group #{i + 1}"
  g.each do |t|
    post.comments.create(body: t)
  end
end