ruby on rails - Rails3 invitations and mailer - how to add variables to routes/urls? -

this should simple fix, i've been unable find answer. can point me in right direction?

i'm implementing rails3 beta invite system la ryan bates - http://railscasts.com/episodes/124-beta-invitations

i've set mailer send out invite urls. works fine, apart 1 small issue.

the url generated mailer /user/sign_up.token.

i need generate /user/sign_up/token (slash instead of period).

i guess need change syntax in "mailer.invitation().deliver", can't find documentation help. can point me in right direction?

the relevant bits of routes file:

devise_for :users,  :path_prefix => 'registration', :controllers => {:registrations => 'users/registrations'}       "registration/users/sign_up/:invitation_token" => "users/registrations#new" end 

invitations controller:

class invitationscontroller < applicationcontroller   def new     @invitation = invitation.new     @title = "invite friend"   end    def create     @invitation = invitation.new(params[:invitation])     @invitation.sender = current_user     if @invitation.save         if user_signed_in?             mailer.invitation(@invitation, new_user_registration_path(@invitation.token)).deliver             redirect_to root_url, :notice => "thank you, friend receive invitation soon."         else             redirect_to root_url, :notice => "thank you, we'll let know when next batch of invites availale."         end     else         if current_user.invitation_limit > 0             render :action => 'new', :alert => "sorry, there problem! please try again."         else             redirect_to root_url, :alert => "sorry, don't have invitations left. please wait until issue more."         end      end   end end 

mailer:

class mailer < actionmailer::base    def invitation(invitation, sign_up)      subject     'invitation'     recipients  invitation.recipient_email     @greeting = "hi"     @invitation = invitation     @signup_url = sign_up     @sender = invitation.sender_id     invitation.update_attribute(:send_at, time.now)          end end 

thank ideas!

not sure if work, maybe try

new_user_registration_url(@invitation.token) 

instead of new_user_registration_path.

another (but not good) method be

new_user_registration_url+"/#{@invitation.token}" #substitute path url maybe 

hope helps!