Rails - Aug 2007 - eval class when config.cache_classes = true

Hi,
I have problem with config.cache_classes = true.
After turning it on, the current_user in tabnav file
definition is not updated.

class Tabnav::MainTabnav < Tabnav::Base
    current_user = User.find(Thread.current[''user''])

    if current_user.has_role? Role::ADMIN
       add_tab do
          named ''''
          iconed ''/images/layout/icons/admin_icon.png''
          links_to :controller => ''/users''
          highlights_on :controller => ''users''
       end
    end
...

When I try:

class Symbol
  def to_tabnav
    file_name = ''tabnav/'' + self.id2name +
''_tabnav''
    load( File.join( File::expand_path(RAILS_ROOT), ''app'',
''models'',
file_name + ''.rb'' ) )
    eval(file_name.camelcase).instance
  end
end

I get user updated, but the code of class is executed twice:
one with load and then with eval(file_name.camelcase).

Because I need to return eval(file_name.camelcase).instance,
But I also need the file to be always up tu date.

Any idea how I might solve it?

Cheers,
Tomasz Bak
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