[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