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Sample rails app that keeps track of active record changes through to after_commit

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# README

I needed a way to keep track of `ActiveModel` changes during a transaction and launch a Sidekiq job in `after_commit` if a value changes.

Alas:

* `ActiveModel::Dirty.changes()` isn't available in `after_commit`
* `ActiveModel::Dirty.previous_changes()` is available but it only reports the most recent `save`

I needed a more robust solution that keeps track of **all** the changes in the transaction -- *even if the model was saved multiple times*.

So I created this sample Rails app with an `ActiveSupport::Concern` called `TrackSavedChanges` where `saved_changes()` returns a single AR-style `changes()` hash that reflects the cumulative effect of a sequence of saves from the first to last.  Consider this code:

after_commit: :after_commit_test

test = Test.create(number: 1, title: "1")
    test = Test.find(test.id) # to initialize a fresh object

test.transaction do
      test.update(number: 2)
      test.update(title: "2")
    end

def :after_commit_test
      puts previous_changes.inspect
      puts saved_changes.inspect
    end

which results in:

previous_changes: {"title"=>["1", "2"], "updated_at"=>[...]}
    saved_changes: {"title"=>["1", "2"], "number"=>[1, 2], "updated_at"=>[...]}

so that `saved_changes` also includes `number` which was omitted from `previous_changes`

To see the issue in action, clone this repo and running `Test.test` from inside the Rails console.  For a deeper understanding see:

* Stack Overflow at http://stackoverflow.com/questions/7128073/after-commit-for-an-attribute
* Module code in [track_saved_changes.rb](https://github.com/ccmcbeck/after-commit/blob/master/app/models/concerns/track_saved_changes.rb)
* Automated test in [test_spec.rb](https://github.com/ccmcbeck/after-commit/blob/master/spec/models/test_spec.rb)

Enjoy!

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