尝试重定向用户（如果他们已登录）时遇到问题

Question

I'm using Rails 4.2.5. If a user is logged in, I want to redirect them if they visit http://localhost:3000/ to http://localhost:3000/user_objects . So I have added this to my config/routes.rb file

  constraints(AuthenticatedUser) do
    root :to => "user_objects"
  end
  root 'pages#index'

Then I have this file in lib/authenticated_user.rb …

class AuthenticatedUser
  def self.matches?(request)
    user_signed_in?
  end
end

Unfortunately, when I'm logged in, and I access http://localhost:3000/ , I get this error

NameError

uninitialized constant AuthenticatedUser

Any idea how I can redirect the user to the suggested page if someone is logged in?

My config/routes.rb file is as follows ...

  resources :user_objects, except: :update do
    member do
      patch :create
      put :create
    end
    get :find_by_user_object_and_day, on: :collection
    get :find_totals, on: :collection
  end

  get "users/edit" => "users#edit"
  resources :users

  root 'pages#index'

  get '/auth/:provider/callback', to: 'sessions#create'
  get '/logout', to: 'sessions#destroy'
  delete '/logout', to: 'sessions#destroy'

Answer 1

In the controller action for whatever root is, you can just say:

if current_user
  redirect_to user_objects_path #look up the rails helper    
end

Answer 2

The documentation on constraints recommends putting custom constraint classes to lib/constraints .

Anyway, for the class to be recognized in routes you should have it autoloaded . Add the directory where the constraint resides to the list of autoloaded directories in application.rb :

# config/application.rb
# Custom directories with classes and modules you want to be autoloadable.
config.autoload_paths += %W[...
                           #{config.root}/lib/constraints]