Redirect user to root after trying to access a page without being authenticated to do so in rails

Question

so, as the title says, how can I redirect the user to the root instead of the sign_in page after the user attempts to access a protected page?

This is my routes.rb file

.
.
. 
  root 'pages#home'

  authenticate :user do
     mount Kibana::Sinatra::Web => '/kibana', :trailing_slash => true
  end
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Answer 1

If you are using authenticate_user! in your controller do the following:

In Your Application Controller add this:

  protected
  def authenticate_user!
    redirect_to root_path, notice: "You are not authorised to access this page" unless user_signed_in?
  end

but if you want to authenticate from routes you have to use constraints

1. Edit your routes to look as following and match not found urls to root:

    mount Kibana::Sinatra::Web => '/kibana', :trailing_slash => true, :constraints => AllowAccess.new match ':not_found' => redirect('/'), :constraints => { :not_found => /.*/ } 

2. Create a new constraint "allow_access" in your lib folder and the following code

    class AllowAccess def matches?(request) return false unless request.session["warden.user.user.key"] end end 

And add this line in your application.rb to autoload the lib file

   config.autoload_paths += Dir["#{config.root}/lib/**/"]