csv_breakup.rb

require 'csv'
input_file = "#{Rails.root}/High School Database CSV.csv"
file_1 = CSV.open("#{Rails.root}/High_School_Database_#{1}.csv", 'w')
file_2 = CSV.open("#{Rails.root}/High_School_Database_#{2}.csv", 'w')
file_3 = CSV.open("#{Rails.root}/High_School_Database_#{3}.csv", 'w')
count = 0
CSV.foreach(input_file) do |row|
  if count < 400000
    file_1 << row
  elsif count < 800000
    file_2 << row
  else
    file_3 << row
  end
  count +=1
end

file_1.close
file_2.close
file_3.close