redirect after sign in

app/controllers/application_controller.rb

@@ -13,6 +13,15 @@
       end
     end
   end
+
+  def after_sign_in_path_for(resource)
+    sign_in_url = new_user_session_path(:only_path => false, :protocol => 'http')
+    if request.referer == sign_in_url
+      super
+    else
+      stored_location_for(resource) || request.referer || root_path
+    end
+  end^
 def get_theme
   if ThemesForRails.available_theme_names.include?(params[:theme])
   params[:theme]

db/migrate/20130805170517_add_id_to_themen.rb

@@ -1,7 +1,7 @@
 class AddIdToThemen < ActiveRecord::Migration
   def change
-		add_column :themen, :themengruppe_id, :integer
+    add_column :themen, :themengruppe_id, :integer
     add_column :attachments, :thema_id, :integer
-		add_column :fragen, :thema_id, :integer
+    add_column :fragen, :thema_id, :integer
   end
 end