Extending Active Record - Rails 3 -

I'm trying to extend Active Record to write a method that will convert
validation errors to xml that can be consumed by Flex. But I'm
following a tutorial that has been written for Rails 2 and I'm using
Rails 3.

Each time i try to call the new method i get the error

undefined method `to_xml_full' for #<ActiveModel::Errors

Here's the code from my application controller ::

`module ActiveRecord #:nodoc:
class Errors #:nodoc:
def to_xml_full(options={})
options[:root] ||= "errors"
options[:indent] ||= 2
options[:builder] ||=
Builder::XmlMarkup.new(:indent => options[:indent])
options[:builder].instruct! unless
options.delete(:skip_instruct)
options[:builder].errors do |e|
# The @errors instance variable is a Hash inside the
# Errors class
@errors.each_key do |attr|
@errors[attr].each do |msg|
next if msg.nil?
if attr == "base"
options[:builder].error("message"=>msg)
else
fullmsg = @base.class.human_attribute_name(attr) +
" " + msg
options[:builder].error(
"field"=>attr, "message"=>fullmsg)
end
end
end
end
end
end
end

and here's the code from user controller that is calling the new
to_xml_full method

def create
    @user = User.new(params[:user])
    @user.points = 50
    logger.info "user errors full: #{@user.errors.to_xml_full}"
    respond_to do |format|
    if @user.save
      sign_in(@user)
      format.html {redirect_to user_path(@user), :flash => { :success
=> "Welcome to Crowdshare App"}}
      #format.xml {render xml: @user, status: :created, location:
@user }
      format.xml {render :text => "error" }
    else
      @title ="Sign up"
      format.html {render action: 'new'}
      #format.xml {render xml: @user.errors,
status: :unprocessable_entity}
      format.xml {render :text => "error" }
    end
    end
  end

Any ideas where i might be going wrong?
Thanks in advance

I'm trying to extend Active Record to write a method that will convert
validation errors to xml that can be consumed by Flex. But I'm
following a tutorial that has been written for Rails 2 and I'm using
Rails 3.

Each time i try to call the new method i get the error

undefined method `to_xml_full' for #<ActiveModel::Errors

The errors stuff is no longer in ActiveRecord::Errors, so you're
extending the wrong class. The error message you're getting suggests
that you should be extending ActiveModel::Errors instead.

Fred

Cheer Fred!