Devise

Example for Warden/Devise with an 'user' scope:

In config/initializers/rails_admin.rb

RailsAdmin.config do |config|
  config.authenticate_with do
    warden.authenticate! scope: :user
  end
  config.current_user_method &:current_user
end

Or for an 'admin' scope:

In config/initializers/rails_admin.rb

RailsAdmin.config do |config|
  config.authenticate_with do
    warden.authenticate! scope: :admin
  end
  config.current_user_method &:current_admin
end