lib/janus/manager.rb
def set_user(user, options = {})
      scope = options[:scope] || Janus.scope_for(user)
      janus_sessions[scope.to_s] = { 'user_class' => user.class.name, 'user_id' => user.id }
    end
def set_user(user, options = {})
      scope = options[:scope] || Janus.scope_for(user)
      janus_sessions[scope.to_s] = { 'user_class' => user.class.name, 'user_id' => user.id }
    end
Manually sets a user without going throught the whole login or
 authenticate process.