[Rails] How to generate an url from a hash {"action"=>"index", "controller"=>"analyses", "locale"=>"en_GB"}

[Erwin]

currently I am keeping trace of locations before authentication using
an application_controller action

  def store_location
    session[:return_to] = request.filtered_parameters       #  and
not ...session[:return_to] = request.fullpath
  end

so, I get session[:return_to]  =>  {"action"=>"index",
"controller"=>"analyses", "locale"=>"en_GB"}

I use an Ajax request to authenticate and  a create a session, then I
need to return to the saved session[;return_to]

  # POST /resource/sign_in
  def create
    .... ..
    sign_in(resource_name, resource)
   ...
    respond_with resource do |format|
      format.js {
        @url = session[:return_to] || root_url
        render :action => "signed_in.js"
      }
    end
  end

signed.js
$(location).attr('href',"<%= @url %>");

but it's wrong as  session[:return_to] =  {"action"=>"index",
"controller"=>"analyses", "locale"=>"en_GB"}, and not an URL

Any idea on how I can generate an url to be used by my .js

url_for([:return_to]) doesn't work ...  as it generate a relative path
to the Devise session controller
ActionController::RoutingError Exception: No route matches
{:controller=>"users/analyses", :locale=>"en_GB"}

thanks for your feedback

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