app/controllers/application_controller.rb

   1 class ApplicationController < ActionController::Base
   2   protect_from_forgery
   3   before_filter :uncamelcase_params_hash_keys
   4
   5   protected
   6
   7   def uncamelcase_params_hash_keys
   8     uncamelcase_hash_keys(params)
   9   end
  10
  11   def uncamelcase_hash_keys(h)
  12     if h.is_a? Hash
  13       nh = Hash.new
  14       h.each do |k,v|
  15         if k.class == String
  16           nk = k.underscore
  17         elsif k.class == Symbol
  18           nk = k.to_s.underscore.to_sym
  19         else
  20           nk = k
  21         end
  22         nh[nk] = uncamelcase_hash_keys(v)
  23       end
  24       h.replace(nh)
  25     end
  26     h
  27   end
  28 end