```ruby
require 'active_support'
require 'active_support/i18n'
````
....
```ruby
  ActiveSupport.on_load :active_record do
    extend ModelAdditions
  end
  ActiveSupport.on_load :i18n do
    I18n.load_path << File.dirname(__FILE__) + '/locale/en.yml'
  end
```

previous code but didn't work the code, I don't know why
Do you know?