Binding 2 models

Question

I have two models and one view, but can not find the proper way how to combine/join the models.

Both Sproutcore models (Employee data) have an attribute function description . But the currently used model function description is out of date, so I need to use the function description of the other model.

functieLabel: function(){
    var bsnInt = parseInt(this.get('bsn'));
    if (SC.none(bsnInt)) return 'loading...';
    //var query = SC.Query.local(App.Medewerker, { conditions: 'bsn = bsnParam'}, {parameters: bsnParam = bsnInt});
    var query = SC.Query.local(App.Medewerker, { conditions: 'bsn = %{bsnParam}'}, {parameters: { bsnParam: bsnInt } });       
    var results = App.store.find(query);
    SC.info('results: length=%@', results.length());
    SC.info('functie: functie=%@',results.objectAt(0).get("functie"))
    var functie = results.objectAt(0).get("functie");
    return functie
}.property('functieLabel'),

I extended MedewerkerDetailInfo with a computed property functieLabel. But the query is not correct, that is, all records are return. Suggestions? Thanks in advance.

    App.MedewerkerDetailInfo = SC.Record.extend({
    ..
    functieLabel: function() {
    ..
    }.property('functieLabel'),
    ..

    App.Medewerker = SC.Record.extend({
    ..
    functie: SC.Record.attr

This one is working as expected:

functieLabel: function(){
    var bsnInt = parseInt(this.get('bsn'));
    if (SC.none(bsnInt)) return 'loading...';
    var query = SC.Query.local(App.Medewerker, {conditions: "bsn = %@", parameters: [bsnInt]});
    var results = Sea.store.find(query);
    var lengte = results.length()
    if (lengte = 0){
        return "onbepaald".toString()
    }
    else {
        return results.getEach("functie").toString()
        }

}.property('bsn'),