gistfile1.rb

class Port
  include DataMapper::Resource
  
  belongs_to :rack_app
  belongs_to :user

  property  :id,        Serial,  :index => true
  property  :port,      Integer,  :default => 3000, :nullable => false
  property  :user_id,   Integer,  :nullable => true,  :index => true

  def self.free_ports
    self.find( :all, :conditions => ["user_id IS NULL" ], :order => :port )
  end

  def self.setup_ports
    (3000..4000).each do |port|
      Port.new( :port => port ).save!
    end
  end

end