Devise

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

In config/initializers/rails_admin.rb

config.authenticate_with do
  warden.authenticate! :scope => :user
end
config.current_user_method { current_user }

Or for an 'admin' scope:

In config/initializers/rails_admin.rb

config.authenticate_with do
  warden.authenticate! :scope => :admin
end
config.current_user_method { current_admin }