With Grails, how do I retain information between different requests/controller actions

I have a controller like this:

def save = {
        def conferenceUser = new ConferenceUser()

        def conf_1 = Conference.get(params.conference.id)
        def role_1 = Role.get(params.role.id)
        def status_1 = Status.get(params.status.id)
        def user_1 = User.get(params.user.id)

        conferenceUser.conference = conf_1

        conferenceUser.dateParticipated = params.dateParticipated
        conferenceUser.accepted = params.accepted

        conferenceUser.status = status_1
        conferenceUser.role = role_1
        conferenceUser.user = user_1


          if (!conferenceUser.save(failOnError: true)) {
        render (view: 'participatedAdd', model : [conferenceUser: conferenceUser])
        return

       render(view: 'participatedAdd2', model: [conferenceUser: conferenceUser])

  }
}

Basically, this is the save controller of my 2-step registration phase. I want to be able to, after saving the first part, load the second view (participatedAdd2), but 开发者_StackOverflowI need to keep the conferenceUser.conference value for the next controller action. How can I access this value in my second save2 controller action?

In your participatedAdd2 view, put a

<input type="hidden" name="conferenceUserId" value="${conferenceUser.id}"/>

in the form that gets submitted to the save2 action. You can then look up the ConferenceUser in your save2 action with:

def conferenceUser = ConferenceUser.get(params.conferenceUserId)