This acts_as extension provides the capability for having a default object. The class that has this specified needs to have a default column defined as an integer, string or boolean on the mapped database table.

In your Gemfile

  gem 'acts_as_defaultable'

Currently is tested on rails3.2, ruby 1.9.3 and mysql

  class Country < ActiveRecord::Base
    acts_as_defaultable :default
  end

  gr = Country.new
  gr.default = true
  gr.save
  Country.default == gr # => true
  uk = Country.new
  uk.default = true
  uk.save
  Country.default == gr # => false

If no options provided default column is assumed.

The option to acts_as_defaultable is the column of the Model that defines default behaviour. This column can be a string, a boolean or an integer with default positive values 'on', true, 1 and default negative values 'off', false, 0 respectively.

acts_as_defaultable is released under the MIT License