Rails - Aug 2010 - [rails3.0.0.beta4] extend form_tag to always include a hidden field

hi there,
I want every form in the site to add a hidden_field, basically I want them
to always submit the I18n.locale, I''ve tried to alias form_tag_html
method
of ActionView::Helpers::FormTagHelper like this:

# in #{MY_APP_ROOT}/lib/action_view/helpers/form_tag_helper.rb
module ActionView::Helpers::FormTagHelper

  def form_tag_html_with_locale(html_options)
    form = form_tag_html_without_locale(html_options)
    form.safe_contact(hidden_field_tag(''locale'', I18n.locale))
  end
  alias_method_chain :form_tag_html, :locale

end

but I get this exception:

in `alias_method'': undefined method `form_tag_html'' for module
`ActionView::Helpers::FormTagHelper'' (NameError)

am I missing something, is this a good approach for this? (I mean
since form_tag_html is a private method, for instance)

what''s your opinion? any ideas? TIA
joaquin

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