ruby on rails - Google authentification error "no route match" -

i have problem, follow tutorial :https://richonrails.com/articles/google-authentication-in-ruby-on-rails.

i have done except rails g controller home show because have static_pages controller , home.html.erb

so in route.rb have replace line tutorial:

resource :home, only: [:show] root to: "home#show"

by

resource :static_pages, only: [:home] root to: 'static_pages#home'

but when click on link after i've launched server (localhost) have error:

no route matches [get] "/auth/google_oauth2"

do have idea problem? hope me.

thank in advance.

edit : route.rb code

rails.application.routes.draw    'sessions/create'   'sessions/destroy'   'sessions/new'   'users/new'    root             'static_pages#home'   'help'    => 'static_pages#help'   'about'   => 'static_pages#about'   'contact' => 'static_pages#contact'   'signup'  => 'users#new'      'login'   => 'sessions#new'   post   'login'   => 'sessions#create'   delete 'logout'  => 'sessions#destroy'    resources :users end googleauthexample::application.routes.draw   'auth/:provider/callback', to: 'sessions#create'   'auth/failure', to: redirect('/')   'signout', to: 'sessions#destroy', as: 'signout'    resources :sessions, only: [:create, :destroy]   resource :static_pages, only: [:home]    root to: 'static_pages#home' end 

it work! devise. dont forget install "mongoid" gem in order set devise (that took me lot of time determine mogoid missing).

thank all!