Changes is a gem that logs the changes in your models after you update the values. Let's say you do a

@model = MyModel.create(:amount => 99)

Then after

@model.update_attribute(:amount => 100)

Then you can see the changes

@model.show_changes

Which will return

["Amount changed from 99.0 to 100.0\n"]

• Rails 3.x (Not tested with Rails 3.1)

In your gemfile:

gem 'changes'

After running a 'bundle install' you need to generate the migrations file

rails generate changes

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In the model where you wish to log the changes, when updating. You add

has_changes

Then after an update you can do

@updated_model.show_changes

And the changes will be listed with before and after values