ED Tracked

controllers.application\.js

import Controller from '@ember/controller';
import { action } from '@ember/object';

export default class ApplicationController extends Controller {  
  @action
  save() {
   	this.model.setProperties(this.changeset);
    
    console.log(this.changeset.name)
    console.log(this.model.name)
  }
}

models.foo\.js

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

export default class extends Model {
}

routes.application\.js

import Route from '@ember/routing/route';
import { tracked } from '@glimmer/tracking';
import { inject } from '@ember/service';

export default class ApplicationRoute extends Route {
  @inject store;
  
  model() {
    return this.store.createRecord('foo', {
      name: 'foo 1'
    });
  }
  
  setupController(controller, model) {
    super.setupController(...arguments);
    
   	controller.changeset = new class Changeset {
   	  @tracked name = model.name;
    }
  }
}

templates.application\.hbs

Change the input in the text field, then press save, then check the console...

<br><br>

<Input @value={{this.changeset.name}} />

<br><br>

Name: {{this.changeset.name}}

<br><br>

<button {{on "click" this.save}}>Save</button>

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"
  }
}