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