so56275372-does-push-reset-dirty-attributes?

controllers.application.js

import Ember from 'ember';
import { inject as service } from '@ember/service';

export default Ember.Controller.extend({
  store: service(),
  
  actions: {
    changeRecord() {
      if (!this.record) {
        alert('You must push record into store before mutating it.');
        return;
      }
      
      this.set('record.title', 'changed');
    },
    pushRecordIntoStore() {
      let record = this.store.push({
        data: {
          type: 'post',
          id: '1',
          attributes: {
            title: 'original'
          }
        }
      });
      
      this.set('record', record);
    }
  }
});

models.post.js

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

export default Model.extend({
  title: attr('string')
});

templates.application.hbs

<h1>Actions</h1>
<button onclick={{action "pushRecordIntoStore"}}>Push record into store</button>
<button onclick={{action "changeRecord"}}>Change record</button>
<h1>Current record</h1>
{{#if this.record}}
  <dl>
    <dt>Title</dt>
    <dd>{{this.record.title}}</dd>
    <dt>hasDirtyAttributes</dt>
    <dd>{{this.record.hasDirtyAttributes}}</dd>
    <dt>dirtyType</dt>
    <dd>{{this.record.dirtyType}}</dd>
  </dl>
{{else}}
  No record pushed yet
{{/if}}

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}