class ActionDispatch::Routing::Mapper

root to: 'landing#show'

end
root to: "admin/dashboard#show", as: :user_root
authenticated :user, lambda {|u| u.role == "admin"} do

end
root to: 'dashboard#show', as: :authenticated_root
authenticated do

end
root to: 'admin/dashboard#show', as: :admin_root
authenticated :admin do

a model and allows extra constraints to be done on the instance.
can optionally specify which scope and a block. The block accepts
Allow you to route based on whether a scope is authenticated. You

def authenticated(scope = nil, block = nil)
  constraints_for(:authenticate?, scope, block) do
    yield
  end
end