An example of how index filtering can be achieved without bloating your controller.
For more info about this repo, read the associated blog post
Clone repo and run bundle install to install any necessary gems.
To populate the app with some test data you can run rake populate_database
To see the filtering in action, simply add some url params to the users index. e.g.
http://localhost:3000/users?country=Congo&last_name=Grady
The project is available as open source under the terms of the MIT License.