How to skip a before filter custom class in Ruby on Rails?

Question

I have a Ruby on Rails Controller with a before_filter using a custom class:

class ApplicationController
  before_filter CustomBeforeFilter      
end

I have another controller inherited from ApplicationController, where I would like to skip the CustomBeforeFilter:

class AnotherController < ApplicationController
  skip_before_filter CustomBeforeFilter
end

That doesn't work. The before_filter is still executed.

How can I skip a Ruby on Rails before filter that uses a custom class?

Answer 1

Class callbacks are assigned a random callback name when they are added to the filter chain. The only way I can think of to do this is to find the name of callback first:

skip_before_filter _process_action_callbacks.detect {|c| c.raw_filter == CustomBeforeFilter }.filter

If you want something a little cleaner in your controllers, you could override the skip_before_filter method in ApplicationController and make it available to all controllers:

class ApplicationController < ActionController::Base
  def self.skip_before_filter(*names, &block)
    names = names.map { |name|
      if name.class == Class
        _process_action_callbacks.detect {|callback| callback.raw_filter == name }.filter
      else
        name
      end
    }

    super
  end
end

Then you could do:

class AnotherController < ApplicationController
  skip_before_filter CustomBeforeFilter
end