gistfile1.js

Y.Guest = Y.Base.create('guest', Y.Model, [Y.ModelSync.REST], {
    root: '/guests/'
});

Y.Guests = Y.Base.create('guests', Y.ModelList, [Y.ModelSync.REST], {
    model: Y.Guest
});

Y.Invitation = Y.Base.create('invitation', Y.Model, [Y.ModelSync.REST], {
    root: '/invitations/',

    initializer: function () {
        this.guests = new Y.Guests({bubbleTargets: this});
    },

    _setGuests: function (guests) {
        return this.guests.reset(guests);
    }
}, {
    ATTRS: {
        guests: {setter: '_setGuests'}
    }
});

@olanb7 are you talking about the model contains a model list part?