Let’s turn this:

  class UpdateYourFamily < ActiveRecord::Migration
    create_table :updates do |t|
      t.column :user_id,  :integer
      t.column :group_id, :integer
      t.column :body,     :text
      t.column :type,     :string

      t.column :created_at, :datetime
      t.column :updated_at, :datetime
    end

    def self.down
      drop_table :updates
    end
  end

  Into this:

  class UpdateYourFamily < ActiveRecord::Migration
    create_table :updates do
      foreign_key :user
      foreign_key :group

      text   :body
      string :type

      timestamps!
    end

    def self.down
      drop_table :updates
    end
  end

Using this:

SVN:

$ ./script/plugin install svn://errtheblog.com/svn/plugins/sexy_migrations

Piston:

$ piston import svn://errtheblog.com/svn/plugins/sexy_migrations vendor/plugins/sexy_migrations