Var Args 10

gistfile1.rb

class User < ActiveRecord::Base
  # A user is active during a period if it has any subscriptions 
  # that are active during that period
  def active?(start_date, end_date)
    subscriptions.active_in_period(start_date, end_date).any?
  end
end

# Lookup User and see if they are active
User.find(1).active?(start_date, end_date) 
=> false

# Lookup AdminUser and see if they are active
User.find(42).active?(start_date, end_date) 
=> true