Routing Problems

Your routes.rb should look like this one:

DummyApp::Application.routes.draw do
  mount RailsAdmin::Engine => '/admin', :as => 'rails_admin'
  devise_for :users
  root :to => "home#index"
  
  resources :articles
  resources :pages
  match ':controller(/:action(/:id(.:format)))'
end

Note 3 things:

• mount RailsAdmin::Engine => '/admin' will catch all /admin urls, including /administrator, which would then blow up in RailsAdmin!
• if you choose to put a catch-up root route before mount RailsAdmin::Engine, make sure it doesn't catch '/admin/'
• a root url is necessary for Devise, and will be used in RailsAdmin (home button)