Fix rails 2.3 filter_parameter_logging for ruby 2.x

patch.rb

# The filter_parameter_logging method, used to filter request parameters
# (such as passwords) from the log, defines a protected method called
# filter_parameter when called. Its existence is later tested using
# respond_to?, without the include_private parameter. Due to the respond_to?
# behavior change, the method existence is never detected, and parameter
# filtering stops working.
require 'action_controller'

module ParameterFilterPatch
  def respond_to?(method, include_private = false)
    if method.to_s == 'filter_parameters'
      include_private = true
    end

    super(method, include_private)
  end
end

module ActionController
  class Base
    prepend ParameterFilterPatch
  end
end

You are a saint Renato!