Get a list of all the filters on a given Rails 3 controller.

application_controller.rb

# Add these methods to your ApplicationController. Then, any controller
# that inherits from it will have these methods and can programmatically
# determine what filters it has set.
class ApplicationController < ActionController::Base

  def self.filters(kind = nil)
    all_filters = _process_action_callbacks
    all_filters = all_filters.select{|f| f.kind == kind} if kind
    all_filters.map(&:filter)
  end

  def self.before_filters
    filters(:before)
  end

  def self.after_filters
    filters(:after)
  end

  def self.around_filters
    filters(:around)
  end

end