FilterDecrufter is a little utility for cleaning up before_filters.

Suppose you have a Rails controller with a before_filter:

before_filter :load_widget, :only => [:show, :frobnicate]

If you've deleted the frobnicate action, Rails won't complain. But FilterDecrufter will!

Add it to your Gemfile in the development group:

# In your Gemfile
gem 'filter_decrufter'

Run the task!

$ bundle exec rake filter_decrufter:check 
Api::V1::WidgetsController before_filter 'find_widget' has an :only constraint with a non-existent action name 'show'
EmployeesController after_filter 'set_name' has an :only constraint with a non-existent action name 'frobnicate'

Tested with Rails 3.2, 4.0, 4.1 and 4.2.

• John Moon - design discussions
• Mike Foley - filter with multiple method bug report
• Sandeep Kumar - Rails 4.2 support
• ipmsteve - code cleanup
• Tom Copeland - author