ruby lambda in a different scope

application_controller.rb

class ApplicationController < ActionController::Base
  
  def self.before_filter_in_instance(&block)
    before_filter do |controller|
      controller.instance_eval(&block)
    end
  end
  
  # fails!
  # params is not available
  # this lambda will be executed in the class scope where it was defined
  before_filter lambda { Rails.logger.info(params[:transaction_id]) }
  
  # succeeds!
  # params is available
  # this lambda will be executed inside the instance of controller
  before_filter_in_instance { Rails.logger.info(params[:transaction_id]) }

end