How do I prevent someone from going to a route/url unless user is admin?

[nko...@gmail.com]

Hello

with rails admin, I can insert the following code into initialisers and therefore prevent someone from going to mysite.com/admin unless
that user is admin (admin is boolean in users table) 

# prevent from going to /admin unless user is admin
  config.authorize_with do
    redirect_to main_app.root_path unless warden.user.admin?
 end

My question is how do I protect a route/url with devise? Can I have the same functionality that rails admin gives me?
I know that I can define actions that require authentication (this article: https://github.com/plataformatec/devise/wiki/How-To:-Define-resource-actions-that-require-authentication-using-routes.rb), but what about going a step further and authenticating an action with a certain user?

Thank you in advance!

[nko...@gmail.com]

Found it, if someone's wondering:
https://www.codementor.io/classes/learn-ruby-on-rails-live

[nko...@gmail.com]

Sorry, wrong link.
Here is the correct one:
https://www.codementor.io/tips/8132473431/use-custom-routing-constraints-to-limit-access-to-rails-routes-via-warden

[Carlos Antonio da Silva]

You should use something like current_user.admin? to check that, and redirect to any route you need.

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At.
Carlos Antonio