Add cleanup detached rake (#52)

* Add cleanup detached rake test

README.md

@@ -103,6 +103,14 @@ Account.unrelease_to_all(:email_marketing, :new_email_flow)
 Account.released_features_to_all
 ```
 
+## Clean up action
+
+By default when a key is removed from `rollout.yml` file, its data still in the storage.
+
+To clean it up, execute or schedule the rake:
+
+    $ bundle exec rake feature_flagger:cleanup_removed_rollouts
+
 ## Contributing
 
 Bug reports and pull requests are welcome!

lib/feature_flagger.rb

@@ -7,6 +7,7 @@
 require 'feature_flagger/feature'
 require 'feature_flagger/configuration'
 require 'feature_flagger/manager'
+require 'feature_flagger/railtie'
 
 module FeatureFlagger
   class << self

lib/feature_flagger/railtie.rb

@@ -0,0 +1,9 @@
+if defined?(Rails)
+  module FeatureFlagger
+    class Railtie < Rails::Railtie
+      rake_tasks do
+        load 'tasks/cleanup.rake'
+      end
+    end
+  end
+end

lib/tasks/cleanup.rake

@@ -0,0 +1,10 @@
+namespace :feature_flagger do
+  desc "cleaning up keys from storage that are no longer in the rollout.yml file"
+  task :cleanup_removed_rollouts => :environment do
+    keys = FeatureFlagger::Manager.detached_feature_keys
+    puts "Found keys to remove: #{keys}"
+    keys.each do |key|
+      FeatureFlagger::Manager.cleanup_detached key
+    end
+  end
+end