I can't seem to find a tutorial on how to do this.

Here's what i have in my controller
Code Ruby:
  def update_lang_pref
    @language = Person.find(session[:user])
 
    if @language.update_attributes(:lang_pref)
      redirect_to request.env['HTTP_REFERER']
  end

and i'm getting an error "can't dup Symbol". Parameters is reading "lang_pref"=>"1"


what am i doing wrong? Any help is appreciated.