Ember Super Rentals Tutorial 3.15 - Working with data

I was following the ember Super Rental 3.15 tutorial, when I got to the working with data section, I updated the route index file with model hooks, the page stopped working. Also I am finding ember tutorials to be incomplete.

error says property of map is undefined code in routes index.js file:

import Route from '@ember/routing/route';

const COMMUNITY_CATEGORIES = [
  'Condo',
  'Townhouse',
  'Apartment'
];

export default class IndexRoute extends Route {
  async model() {
    let response = await fetch('/api/rentals.json');
    let { data } = await response.json();

    return data.map(model => {
      let { attributes } = model;
      let type;

      if (COMMUNITY_CATEGORIES.includes(attributes.category)) {
        type = 'Community';
      } else {
        type = 'Standalone';
      }

      return { type, ...attributes };
    });
  }
}

image if error message: