class IpInterface < Sequel::Model

  many_to_one :layer3_interface, :key => :id

  def before_save do
    if new?
      self.layer3_interface = Layer3Interface.new
    end
  end
end

class Layer3Interface < Sequel::Model
  one_to_many :ip_interfaces, :one_to_one => true, :key => :id
end