Generic REST application.js CRUD adapter for `ember-cli-simple-store` with `ember-simple-auth`

application.js

import config from 'newseed/config/environment';
import { inject as service } from '@ember/service';
import RSVP from 'rsvp';
import EmberObject from '@ember/object';
import PromiseMixin from 'ember-promise/mixins/promise';
import DataAdapterMixin from 'ember-simple-auth/mixins/data-adapter-mixin';

var RESTAdapter = EmberObject.extend(DataAdapterMixin, {
  simpleStore: service(),
  session: service('session'),

  serverEndpoint: `${config.apiHost}/${config.apiNameSpace}/`,

  authorize(xhr) {
    let { access_token } = this.get('session.data.authenticated');
    xhr.setRequestHeader('Authorization', `Bearer ${access_token}`);
  },

  find(store) {
    const simpleStore = this.get('simpleStore');
    const serverEndpoint = this.get('serverEndpoint');
    return PromiseMixin.xhr(`${serverEndpoint}/${store}/`, 'GET').then((response) => {
      response.forEach(function(item) {
        simpleStore.push(`${store}`, item);
      });
      return simpleStore.find(`${store}`);
    });
  },
  
  findById(store, id) {
    const simpleStore = this.get('simpleStore');
    return simpleStore.find(`${store}`, id);
  },

  insert(store, item) {
    const simpleStore = this.get('simpleStore');
    const serverEndpoint = this.get('serverEndpoint');
    let hash = { data: JSON.stringify(item) };
    return new RSVP.Promise(function(resolve, reject) {
      return PromiseMixin.xhr(`${serverEndpoint}/${store}/`, 'POST', hash).then(function(persisted) {
        var inserted = simpleStore.push(`${item}`, persisted);
        resolve(inserted);
      }, function(err) {
        reject(err);
      });
    });
  },

  update(store, item) {
    const _id = item.get('id');
    const serverEndpoint = this.get('serverEndpoint');
    const hash = {
      data: JSON.stringify(item)
    };
    const endpoint = `${serverEndpoint}/${store}/%@/`.fmt(_id);
    return PromiseMixin.xhr(endpoint, 'PUT', hash);
  },

  remove(store, item) {
    const simpleStore = this.get('simpleStore');
    const serverEndpoint = this.get('serverEndpoint');
    const _id = item.get('id');
    const endpoint = `${serverEndpoint}/${store}/%@/`.fmt(_id);
    return new RSVP.Promise(function(resolve, reject) {
      return PromiseMixin.xhr(endpoint, 'DELETE').then(function(arg) {
        simpleStore.remove(`${store}`, _id);
        resolve(arg);
      }, function(err) {
        reject(err);
      });
    });
  }
});

export default RESTAdapter;