Snippet that saves an array of hashes to a CSV file easily

to_csv.rb

require 'csv'

class Array
  def to_csv(csv_filename, homogeneous_headers = false)
    return unless self.any?
    headers = if homogeneous_headers
      self.first.keys
    else
      self.inject([]) { |memo, row| memo |= row.keys; memo }
    end
    CSV.open(csv_filename, "wb") do |csv|
      csv << headers
      self.each do |hash|
        row = headers.map { |h| hash[h] }
        csv << row
      end
    end
  end
end