Newbie question: undefined method 'number_with_delimiter'(probably configuration problem)

Hi all:
       i am using gem to insall rails 2.3.3 and using $rails myapp to
generate my application, but strangely i can't use the number_helper
      below is my env:
export RUBY_HOME=$HOME/ruby
export GEM_HOME=$HOME/gems
export RUBYLIB=$RUBY_HOME/lib:$RUBY_HOME/lib/ruby:$RUBY_HOME/lib/
site_ruby/1.8
export PATH=$HOME/gems/bin:$HOME/ruby/bin:

and:
$ locate number_helper.rb
/home/lobatt/gems/gems/actionpack-2.3.3/lib/action_view/helpers/
number_helper.rb

and i didn't modify the file under config dir except database.yml.
Isn't actionpack included in rails projects by default? how can i get
number_with_delimiter() work?

Thanks in advance.

Hi all:
i am using gem to insall rails 2.3.3 and using $rails myapp to
generate my application, but strangely i can't use the number_helper
below is my env:

Where are you calling it from ?

Fred

Fred:
Thanks for your reply, i call it from my controller, like this:
class Visitor::UserAgentStatsController < ApplicationController
  def index
    VisitorUserAgentStats.find(:all)
    number_with_delimiter(record.user_agent)
    respond_to do |format|
      format.html # index.html.erb
      format.xml { render :xml => @graph}
    end
  end

I wonder how can i make number_with_delimtier availabe to my code?
while i am using ApplicationController without any require or inlucde
directive...

sorry, the source code should be like this:
class Visitor::UserAgentStatsController < ApplicationController
  def index
    @graph = Array.new
    @stats = VisitorUserAgentStats.find(:all)
    @stats.each do |record|
        @graph.push(number_with_delimiter(record.user_agent))
    end
    respond_to do |format|
      format.html # index.html.erb
      format.xml { render :xml => @graph}
    end
  end

I wonder how can i make number_with_delimtier availabe to my code?
while i am using ApplicationController without any require or inlucde
directive...

helpers are available to views only (hence the name view helpers) (at
least not unless you start playing some games which you seem to say
you don't want to do see http://snippets.dzone.com/posts/show/1799 for
example)

Fred

Thanks Fred, it is a great help!
surely i won't apply that hack, so i just used str.gsub!(/(\d)(?=(\d\d
\d)+(?!\d))/, "\\1,")