Ember.js Query Params: Observe multiple query params then run a function once when one or more params are changed

ember-query-params-expensive.js

var expensiveQuery = function(message) {
  console.log('*** EXPENSIVE QUERY ***');
  console.log('start:', this.get('start'));
  console.log('end:', this.get('end'));
};

export default Ember.Controller.extend({
  queryParams: ['start', 'end'],
  start: null,
  end: null,
  paramsDidChange: function() {
    Ember.run.once(this, expensiveQuery);
  }.observes('start', 'end'),
});