Having nested promises and returning them in route won't update the route model and the template using that model

in my route model i need to send two requests (previous and latest) and on the response i grab their ids to send two other requests(baslineCpature and currentcapture). when i got the responses of both requests, i need to send two other requests(fiberHealthData, wavelengthsPerSectionData). ember model should return (baslineCpature,currentcapture, fiberHealthData, wavelengthsPerSectionData ). one issue i have here is that i want to update my template as soon as i get response for baslineCpature and currentcapture.

Here is my code. I appreciate if someone can tell me what i am doing wrong.

model: function (params,transition) {

  var promiseA=null;
  var promiseB=null;
  var promiseA1=null;
  var promiseB1=null;

  promiseA1 = Ember.RSVP.hash({
    latest:this.store.findAll('latest'),
    previous: this.store.findAll('previous'),
  });

  promiseA= promiseA1.then((promiseAResolved) => {
    return Ember.RSVP.hash({
      baselineCapture:self.store.find('capture', promiseAResolved.previous.get('firstObject.id')),
      currentCapture: self.store.find('capture', promiseAResolved.latest.get('firstObject.id')),
    });
  });

  promiseB= promiseA.then((promiseAResolved) => {
    baselineId =  promiseAResolved.baselineCapture.id;
    currentId =  promiseAResolved.currentCapture.id;

    return Ember.RSVP.hash({
      fiberHealthData:self.store.findAll('fiber-health',{ adapterOptions: {current: currentId, baseline: baselineId}}),
      wavelengthsPerSectionData:self.store.findAll('wavelengths-per-section',{ adapterOptions: {current: currentId, baseline: baselineId}} )
    });
  });

//this should be retun of my model
  return Ember.RSVP.hash({
    baselineCapture:promiseA.baselineCapture,
    currentCapture:promiseA.currentCapture,
     fiberHealthData:promiseB.fiberHealthData,
    wavelengthsPerSectionData:promiseB.wavelengthsPerSectionData,
  });
}