New item added in array doesn't get reflected about ember-cli-selectize HOT 7 CLOSED

  var controller = this;
  var newsupplier = this.store.createRecord('supplier', {
    companyname :this.get('companyname'),
    email :this.get('email'),
    address1 :this.get('address1'),
    address2 :this.get('address2'),
    suburb :this.get('suburb'),
    city :this.get('city'),
    state :this.get('state'),
    country : this.get('country'),
    zipcode :this.get('zipcode')
  });

  newsupplier.save().then(function(){
    controller.set('companyname','');
    controller.set('email','');
    controller.set('address1','');
    controller.set('address2','');
    controller.set('suburb','');
    controller.set('city','');
    controller.set('state','');
    controller.set('country','');
    controller.set('zipcode','');

                 controller.get('suppliers').pushObject(newsupplier);  //not working

                 controller.get('suppliers').reload(); // not working

  })

  // I tried converting it into arrray(i got it while googling  -- but didn't worked)
  var suppliers = this.get('suppliers').toArray()
   suppliers.addObjects(this.get('suppliers'));
   suppliers.addObject(newsupplier);
   this.set('suppliers', suppliers);

     this.get('suppliers').pushObject(newsupplier._internalModel); // working but not a standard method to do it


}

  <div class="field">
      <label>New Supplier </label>
  <div class="ui blue small submit button"  {{action "openSupplierModal"}}>Submit</div>
      {{ember-selectize
  content=suppliers
  optionValuePath="content.id"
  optionLabelPath="content.companyname"
  selection=supplier
  placeholder="Select an item" }}
    </div>

import Ember from 'ember';

export default Ember.Route.extend({
  model: function() {
    return this.store.findAll('product');
  },

  setupController: function(controller ,model) {
        controller.set('products',model);
       controller.set('suppliers', this.store.findAll('supplier'));
       controller.set('producttypes', this.store.findAll('producttype'));
       controller.set('productbrands', this.store.findAll('productbrand'));
  }
});