gistfile1.txt

class CreateInterfaces < ActiveRecord::Migration
  def self.up
    create_table :interfaces do |t|
      t.string :name
      t.string :description
      t.timestamps
    end
  end
  
  def self.down
    drop_table :interfaces
  end
end

class CreateConnections < ActiveRecord::Migration
  def self.up
    create_table :connections do |t|
      t.integer :from_interface_id
      t.integer :to_interface_id
      t.timestamps
    end
  end
  
  def self.down
    drop_table :connections
  end
end


class Interface < ActiveRecord::Base
  has_one :connection
end

class Connection < ActiveRecord::Base
  belongs_to :from_interface, :class_name => 'Interface', :foreign_key => :from_interface_id
  belongs_to :to_interface, :class_name => 'Interface', :foreign_key => :to_interface_id
end