Transactional Bulk Endpoint

controllers.application\.js

import Controller from '@ember/controller';
import { action } from '@ember/object';
import { tracked } from '@glimmer/tracking';
import { inject as service } from '@ember/service';
import { recordIdentifierFor } from '@ember-data/store';

let count = 2;
export default class ApplicationController extends Controller {
  appName = 'Ember Twiddle';
  @service store;

  all = this.store.peekAll('audit');

  @tracked records = [
    this.store.push({
      data: {
        type: 'audit',
        id: '1',
        attributes: { name: 'Initial Audit' }
      }
    })
  ];

  get savedRecords() {
    return this.records.filter(r => !r.isNew);
  }

  get pendingRecords() {
      return this.records.filter(r => r.isNew);
  }

  @action addNewRecord() {
    const rCount = count++;
    const audit = this.store.createRecord('audit', {
      name: `new audit ${rCount}`,
      count: rCount
    });
    this.records.push(audit);
    this.records = this.records;
  }

  async mySaveRequestMethod(records) {
    const fetchedJson = await Promise.resolve({
      data: records.map(r => {
      	return { id: `${r.count}`, type: 'audit'  };
      })
    });
    
    const identifiers = records.map(r => recordIdentifierFor(r));
    fetchedJson.data.forEach((resource, i) => {
      resource.lid = identifiers[i].lid;
    });
    
    this.store.push(fetchedJson);
  }

  @action async bulkSave() {
  	const pending = this.pendingRecords;
    
    await this.mySaveRequestMethod(pending);
  }
}

models.audit\.js

import Model, { attr } from '@ember-data/model';

export default class extends Model {
  @attr name;
  @attr count;
}

templates.application\.hbs

<h1>Welcome to {{this.appName}}</h1>
<br>

<h2>All</h2>
<ul>
{{#each this.all as |record|}}
  <li>{{record.name}} - {{record.id}}</li>
{{else}}
  <p>No Records</p>
{{/each}}
</ul>

<h2>Saved</h2>
<ul>
{{#each this.savedRecords as |record|}}
  <li>{{record.name}} - {{record.id}}</li>
{{else}}
  <p>None Saved</p>
{{/each}}
</ul>

<h2>Pending</h2>
<ul>
{{#each this.pendingRecords as |record|}}
  <li>{{record.name}}</li>
{{else}}
  <p>None pending</p>
{{/each}}
</ul>

<button {{on "click" this.addNewRecord}}>Add New</button><br>
<button {{on "click" this.bulkSave}}>Save all</button>

<br>
{{outlet}}
<br>
<br>

twiddle\.json

{
  "version": "0.17.1",
  "EmberENV": {
    "FEATURES": {},
    "_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false,
    "_APPLICATION_TEMPLATE_WRAPPER": true,
    "_JQUERY_INTEGRATION": true
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.js",
    "ember": "3.18.1",
    "ember-template-compiler": "3.18.1",
    "ember-testing": "3.18.1"
  },
  "addons": {
    "@glimmer/component": "1.0.0",
    "ember-data": "3.18.0"
  }
}