Update-Delete-Create

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  _counter: 1,
  
  actions: {
    modifyChildren() {
      let parent = this.get('model');

      parent.get('children').then((children) => {
        let first = children.get('firstObject');
        let last = children.get('lastObject');

        let data = [
          { id: first.get('id') },
          { id: last.get('id'), isDeleted: true },
          { isNew: true }
        ];

        return this._updateChildren(parent, this._counter, data);
      }).then(() => {
        this._counter++;
      });
    }
  },

  _updateChildren(parent, counter, data) {
    data = data.map(({ id, isNew, isDeleted }) => {
      if (isNew) {
        return this.store.createRecord('child', {
          parent,
          name: `Created - ${counter}`
        }).save();
      } else if (isDeleted) {
        return this.store.peekRecord('child', id).destroyRecord();
      } else {
        let record = this.store.peekRecord('child', id);
        record.set('name', `Updated - ${counter}`);
        return record.save();
      }
    });

    return Ember.RSVP.all(data);
  }
});

mirage.config.js

export default function() {
  this.get('/parents/:id');
  
  this.get('/parents/:id/children', function ({ children }) {
    let json = this.serialize(children.all());
    return json;
  });
  
  this.get('/children/:id');
  this.post('/children');
  this.patch('/children/:id');
  this.del('/children/:id');
};

mirage.factories.child.js

import { Factory, faker, trait } from 'ember-cli-mirage';

export default Factory.extend({
  name() {
    return faker.name.findName();
  }
});

mirage.factories.parent.js

import { Factory, faker, trait } from 'ember-cli-mirage';

export default Factory.extend({
  name() {
    return faker.name.findName();
  }
});

mirage.models.child.js

import { Model, belongsTo, hasMany } from 'ember-cli-mirage';

export default Model.extend({
  parent: belongsTo()
});

mirage.models.parent.js

import { Model, belongsTo, hasMany } from 'ember-cli-mirage';

export default Model.extend({
  children: hasMany()
});

mirage.scenarios.default.js

export default function(server) {  
  let parent = server.create('parent');
  
  server.createList('child', 2, { parent });
}

mirage.serializers.application.js

import { JSONAPISerializer } from 'ember-cli-mirage';

export default JSONAPISerializer.extend({
});

mirage.serializers.parent.js

import { JSONAPISerializer } from 'ember-cli-mirage';

export default JSONAPISerializer.extend({
  links(parent) {
    return {
      'children': {
        related: `/parents/${parent.id}/children`
      }
    };
  }
});

models.child.js

import Model from "ember-data/model";
import attr from "ember-data/attr";
import { belongsTo, hasMany } from "ember-data/relationships";

export default Model.extend({
  name: attr('string'),
  parent: belongsTo('parent')
});

models.parent.js

import Model from "ember-data/model";
import attr from "ember-data/attr";
import { belongsTo, hasMany } from "ember-data/relationships";

export default Model.extend({
  name: attr('string'),
  children: hasMany('child')
});

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
  	return this.store.findRecord('parent', 1);
  }
});

templates.application.hbs

<h1>Add/Update/Delete relation</h1>

<p>Parent {{ model.name }} has:</p>

<ul>
	{{#each model.children as |child|}}
  	<li>{{ child.name }}</li>
  {{/each}}
</ul>

<button type="button" onclick={{ action "modifyChildren" }}>
	Modify children
</button>

tests.acceptance.smoke-test.js

import { test } from 'qunit';
import moduleForAcceptance from '../../tests/helpers/module-for-acceptance';

moduleForAcceptance('Modify multiple relation models');

test('smoke test', function(assert) {  
  visit('/');
  click('button');

  andThen(function() {
    assert.equal($('#test-root li').length, 2);
  });
});

tests.helpers.destroy-app.js

import Ember from 'ember';

export default function destroyApp(application) {
  Ember.run(application, 'destroy');
}

tests.helpers.module-for-acceptance.js

import { module } from 'qunit';
import Ember from 'ember';
import startApp from '../helpers/start-app';
import destroyApp from '../helpers/destroy-app';

const { RSVP: { Promise } } = Ember;

export default function(name, options = {}) {
  module(name, {
    beforeEach() {
      this.application = startApp();

      if (options.beforeEach) {
        return options.beforeEach.apply(this, arguments);
      }
    },

    afterEach() {
      let afterEach = options.afterEach && options.afterEach.apply(this, arguments);
      return Promise.resolve(afterEach).then(() => destroyApp(this.application));
    }
  });
}

tests.helpers.resolver.js

import Resolver from '../../resolver';
import config from '../../config/environment';

const resolver = Resolver.create();

resolver.namespace = {
  modulePrefix: config.modulePrefix,
  podModulePrefix: config.podModulePrefix
};

export default resolver;

tests.helpers.start-app.js

import Ember from 'ember';
import Application from '../../app';
import config from '../../config/environment';

const { run } = Ember;
const assign = Ember.assign || Ember.merge;

export default function startApp(attrs) {
  let application;

  let attributes = assign({rootElement: "#test-root"}, config.APP);
  attributes = assign(attributes, attrs); // use defaults, but you can override;

  run(() => {
    application = Application.create(attributes);
    application.setupForTesting();
    application.injectTestHelpers();
  });

  return application;
}

tests.test-helper.js

import resolver from './helpers/resolver';
import {
  setResolver
} from 'ember-qunit';

setResolver(resolver);

twiddle.json

{
  "version": "0.12.1",
  "ENV": {
    "ember-cli-mirage": {
      "enabled": true
    }
  },
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": true
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.13.1",
    "ember-cli-mirage": "0.3.1"
  }
}