ArRollout

ArRollout is the ActiveRecord version of Rollout, written after the wonderful Railscast 315-rollout-and-degrade by Ryan Bates (thank you). Originally released as https://github.com/doochoo-inc/ar_rollout but now maintained at https://github.com/markpundsack/ar_rollout.

This project rocks and uses MIT-LICENSE.

To use this gem, add on your gemfile

gem 'ar_rollout'

and run the generator:

rails generate ar_rollout

This will create for you the initializer and the migration.

The migration looks like this:

class CreateRollout < ActiveRecord::Migration
  def up
    create_table :rollouts do |t|
      t.string :name
      t.string :group
      t.integer :user_id
      t.integer :percentage
      t.integer :failure_count
    end
  end

  def down
    drop_table :rollouts
  end
end

The initializer like this:

ArRollout.configure do |configure|
  # # Here you can define the logic for your own groups
  # # For example, if you have a admin? method for your User class
  # # you can define an :admin group:

  configure.define_group(:all) do |user|
    true
  end

  # configure.define_group :admin do |user|
  #   user.admin?
  # end

  # What if you want to add your 3 developers using email to a :dev group?
  # configure.define_group :devs do |user|
  #   ["alice@yourcompany.com", "bob@yourcompany.com"].include? user.email
  # end
end

You have to run the migration to have the table rollouts created in database:

rake db:migrate

And that's it. You're now ready to use ArRollout.

If you want to add a feature to a group you define in config/initializer/ar_rollout.rb, in your rails console you can do:

ArRollout.activate_group  :my_new_amazing_feature, :tester
ArRollout.activate_user   :my_new_amazing_feature, current_user

Or via rake with:

rake rollout:activate_group[my_new_amazing_feature,all]

So, in your controller/view you can use the helper method rollout? :my_new_amazing_feature, which will test if the current_user is enabled to that feature.

In your *_controller.rb:

before_filter :rollout
around_filter :degrade

private

def rollout
  redirect_to root_url, alert: "Feature unavailable" unless rollout? :phone
end

def degrade
  degrade_feature(:phone) { yield }
end

List known features with:

ArRollout.features

• Optimize user lookup
• Optimize database structure
• Merge ArRollout and Rollout class methods
• Autodetection of new features from code, before rollout begins

• Add Group, Membership, OptOut

• ArRollout caches groups

• Add rake task 'rollout:summary'

• Add rake task 'rollout:list'

• Add ArRollout.info

• Add percentage support
• Add feature list with ArRollout.features

• Add ArRollout.deactivate_all method and rake task

• Add :all to default initializer

• Generator which create both migration and initializer
• activate_group and deactivate_group methods are available
• activate_user_ and deactivate_user methods are available