How can I save the destination url with all the parameters?

If I understand what you're asking, .... In your controller when you test whether a user is logged-in or not, if they aren't logged in, you'll want to save their current request uri in their session so that you can later redirect them to that orig destination once they've successfully logged in. Something like:

...   # the place in your controller where you test logged-in-ness:   if not is_user_logged_in     session[:pre_login_req_uri] = request.env['REQUEST_URI']     redirect_to(:action=>:login)     return   end ...

  # in your login meth, after the user has successfully logged-in:   pre_login_uri = session[:pre_login_req_uri]   session[:pre_login_req_uri] = nil   if pre_login_req_uri     redirect_to(pre_login_req_uri)   else     redirect_to(:action=>:index)   end   return ...

Jeff