Rails роутинг в зависимости от роли пользователя?

Rails.application.routes.draw do
  root action: :index, controller: 'institution/base', constraints: RoleRouteConstraint.new( :is_institution? )
  root action: :index, controller: 'admin/base', constraints: RoleRouteConstraint.new( :is_admin? )
  root action: :log_in, controller: :sessions
end

class RoleRouteConstraint
  def initialize( attr = false )
    @attr = attr
  end

  def matches?( request )
    user = current_user( request.session[ :user_id ] ) if @attr
    user.present? && Proc.new { | user | user.try( @attr ) || false }.call( user )
  end

  def current_user( user_id )
    User.find_by( id: user_id ) if user_id
  end
end