WhenCommitted

Provides #when_commited to run instance-specific code in an ActiveRecord #after_commit callback.

This is very useful for things like enqueuing a background job that is triggered by a model changing state. Usually, it is not sufficient to enqueue the job in an #after_save hook, because there is always the chance that the save will be rolled back (or that the job gets picked up before the save is committed). You could try moving that code to an after_commit callback, but then you do not have access to the #changes to your model (they have already been applied), so it may be difficult to make decisions on whether to enqueue the job or not.

Add this line to your application's Gemfile:

gem 'when_committed'

And then execute:

$ bundle

Or install it yourself as:

$ gem install when_committed

Include the WhenCommitted::ActiveRecord module in your model:

class Post < ActiveRecord::Base
  include WhenCommitted::ActiveRecord
end

Call #when_committed with a block of code that should run when the transaction is committed:

def update_score(new_score)
  self.score = new_score
  when_committed { Resque.enqueue(RecalculateAggregateScores, self.id) }
end

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request