edit.js

import Controller from '@ember/controller';

export default Controller.extend({
  selectedCountries:null,
  actions:{
    updateUser(selectedParentRegion,user){
      user.get('authorizedRegions').pushObject(this.store.createRecord('authorized-region',{
        userId:user.id,
        regionId:selectedParentRegion.id,
        authorizedCountries:this.get('selectedCountries')
      }));
      user.save();
    },
    updateCountrySelection(newSelection) {
      this.set('selectedCountries', newSelection);
    }
  }
});