Nostalgia

Often I want to evaluate what changed on an object after it has saved and has been transactionally committed. One use case is enqueuenig a background job when a specific attribute changed. Typically you should wait until after_commit to enqueue the job. This ensures that your workers will have access to the updates that were being made inside the transaction. This is a problem because ActiveRecord forgets the changes after_save. This gem keeps those changes around for later inspection and evaluation.

Add this line to your application's Gemfile:

gem 'nostalgia'

And then execute:

$ bundle

Or install it yourself as:

$ gem install nostalgia

class Model < ActiveRecord::Base
  include Nostalgia
end

model = Model.create(:foo => :bar)
model.nostalgia

#=> {:foo => [nil,:bar], :id => [nil, 1]}

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