Patch to fix Mongoid aliased names shortcomings

mongoid_aliased_field.rb

# Copy the contents to a file named mongoid_aliased_field.rb and drop it in the lib/ directory of your Rails app
# Add lib/ to autoload paths in the config/application.rb
# require 'mongoid_aliased_field' right after you add the lib/ to autoload path
#
#   #Autoload the files in the lib directory
#   config.autoload_paths += %W(#{config.root}/lib)
#
#   # Require the mongoid_aliased_field monkey patching file explicitly
#   require 'mongoid_aliased_field'

module Mongoid
  module Fields
    module ClassMethods

      #   
      # This is a wrapper for the Mongoid's +field+ method, supplementing it
      # with the following additions :
      # * Defines getter and setter methods for the short original field name
      # * Defines dirty attribute tracking methods for the long aliased field name
      #   
      # The additional methods defined are just thin wrappers around the already available
      # ones. They do not do anything with the data.
      #
      # The options are passed as it is to the +field+ method
      # Using this is exactly same as the +field+ method
      #   
      def aliased_field(field_name, options = {}) 
        alias_name = options[:as]
        field(field_name, options)
        if alias_name
          define_method("#{field_name}") { __send__(alias_name) }
          define_method("#{field_name}=") { |value| __send__("#{alias_name}=", value) }

          attribute_methods_suffixes = ['_change', '_changed?', '_was', '_will_change!']
          attribute_methods_suffixes.each do |suffix|
            define_method("#{alias_name}#{suffix}") { __send__("#{field_name}#{suffix}") }
          end 
        end 
      end 

    end #__End of module ClassMethods__
  end #__End of module Fields__
end #__End of module Mongoid__