add after_accept_path_for method

app/controllers/devise/invitations_controller.rb

@@ -18,9 +18,9 @@ def create
 
     if resource.errors.empty?
       set_flash_message :notice, :send_instructions, :email => self.resource.email
-      redirect_to after_sign_in_path_for(resource_name)
+      respond_with resource, :location => redirect_location(resource_name, resource)
     else
-      render_with_scope :new
+      respond_with_navigational(resource) { render_with_scope :new }
     end
   end
 
@@ -40,9 +40,10 @@ def update
 
     if resource.errors.empty?
       set_flash_message :notice, :updated
-      sign_in_and_redirect(resource_name, resource)
+      sign_in(resource_name, resource)
+      respond_with resource, :location => after_accept_path_for(resource)
     else
-      render_with_scope :edit
+      respond_with_navigational(resource){ render_with_scope :edit }
     end
   end
 
@@ -55,7 +56,11 @@ def has_invitations_left?
     unless current_inviter.nil? || current_inviter.has_invitations_left?
       build_resource
       set_flash_message :alert, :no_invitations_remaining 
-      render_with_scope :new
+      respond_with_navigational(resource) { render_with_scope :new }
     end
   end
+
+  def after_accept_path_for(resource)
+    after_sign_in_path_for(resource)
+  end
 end

devise_invitable.gemspec

@@ -22,7 +22,7 @@ Gem::Specification.new do |s|
 
   {
     'rails'  => ['>= 3.0.0', '<= 3.2'],
-    'devise' => ['>= 1.2.0', '<= 1.4.0']
+    'devise' => '~> 1.3.1'
   }.each do |lib, version|
     s.add_runtime_dependency(lib, *version)
   end

test/rails_app/app/views/free_invitations/new.html.erb

@@ -1,6 +1,6 @@
 <h2>Send invitation</h2>
 
-<%= form_for resource, :as => resource_name, :url => free_invitation_path(resource_name) do |f| %>
+<%= form_for resource, :as => resource_name, :url => free_invitation_path do |f| %>
   <%= devise_error_messages! %>
 
   <p><%= f.label :email %><br />