ember model array and computed properties

Say I have the following:

export default DS.Model.extend({

    analyses: DS.hasMany('analysis', { async: true }),

    requiresAuth: Ember.computed.equal('analyses.@each.requiresAuth', true),

    isAdjusted: Ember.computed.equal('analyses.@each.isAdjusted', true)

});

The idea is that I can query the top level model to see if any of the child analysis models have isAdjusted or requiresAuth

it's not working - hence the question - am I asking too much of ember data + computed?