Merge multiple csv files into one in Ruby

merge_csv.rb

require "csv"

def csv_headers
  ["Your", "Headers", "Here"]
end

files = Dir["file_names_*.csv"].sort_by { |f| "if you want to sort the files" }
file_contents = files.map { |f| CSV.read(f) }

csv_string = CSV.generate do |csv|
  csv << csv_headers
  file_contents.each do |file|
    file.shift                  # remove the headers of each file
    file.each do |row|
      csv << row
    end
  end
end

File.open("one_csv_to_rule_them_all.csv", "w") { |f| f << csv_string }