ember-changeset-validations delay issue

controllers.application.js

import Ember from 'ember';
import AdultValidations from '../validations/adult';
import ChildValidations from '../validations/child';
import { reservedEmails } from '../validators/uniqueness';
import { schema } from '../models/user';

const { get } = Ember;
const { keys } = Object;
 
export default Ember.Controller.extend({
  AdultValidations,
  ChildValidations,
  reservedEmails,
  
  actions: {
    save(changeset) {
      let snapshot = changeset.snapshot();
      return changeset
        .cast(keys(schema))
        .validate()
        .then(() => {
          if (get(changeset, 'isValid')) {
      			console.log('changes being executed:', changeset.get('changes'));
            return changeset.execute();
          }
        }).catch(() => {
          changeset.restore(snapshot);
        });
    },
    
    reset(changeset) {
      return changeset.rollback();
    },
    
    validateProperty(changeset, property) {
      return changeset.validate(property);
    }
  }
});

models.user.js

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

export const schema = {
	firstName: attr('string'),
  lastName: attr('string'),
  email: attr('string'),
  age: attr('number'),
  job: attr('string')
};

export default DS.extend(schema);

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
    return this.get('store').createRecord('user', {
      firstName: 'Jim',
      lastName: 'Bob',
      email: 'jim@bob.com',
      job: 'Director of Bob',
      age: 18
    });  
  }
});

templates.application.hbs

{{marketing-copy reservedEmails=reservedEmails}}
<hr>

{{!-- 
  Try changing `type` to `child` and `validations` to `ChildValidations` 
--}}
{{edit-user 
		user=model
    validations=AdultValidations
    type="adult"
    save=(action "save")
    reset=(action "reset")
    validateProperty=(action "validateProperty")
}}

templates.components.edit-user.hbs

<h4>{{type}} user: <code>{{user.firstName}} {{user.lastName}}, age {{user.age}} is a {{user.job}}</code></h4>
{{#with (changeset user validations) as |changeset|}}
  	
  {{validated-field 
      type="text" 
      changeset=changeset
      property="firstName"
      validateProperty=(action validateProperty changeset "firstName")
  }}
  
  {{validated-field 
      type="text" 
      changeset=changeset
      property="lastName"
      validateProperty=(action validateProperty changeset "lastName")
  }}
  
  {{validated-field 
      type="text" 
      changeset=changeset
      property="email"
      validateProperty=(action validateProperty changeset "email")
  }}
  
  {{validated-field 
      type="text" 
      changeset=changeset
      property="job"
      validateProperty=(action validateProperty changeset "job")
  }}
  
	{{validated-field 
      type="number" 
      changeset=changeset
      property="age"
      validateProperty=(action validateProperty changeset "age")
  }}
  
	<div class="row">
  	<button {{action save changeset}} disabled={{changeset.isInvalid}} class="button-primary">Save</button>
  	<button {{action reset changeset}}>Reset</button>
	</div>
{{/with}}

templates.components.marketing-copy.hbs

<iframe src="https://ghbtns.com/github-btn.html?user=DockYard&repo=ember-changeset&type=star&count=true" frameborder="0" scrolling="0" width="170px" height="20px"></iframe>

<iframe src="https://ghbtns.com/github-btn.html?user=DockYard&repo=ember-changeset-validations&type=star&count=true" frameborder="0" scrolling="0" width="170px" height="20px"></iframe>

<p><code>ember-changeset</code> and <code>ember-changeset-validations</code> provide an easy way to validate and set changes to your data. Unlike CP or observer based validations, you don't need to write anything special to prevent data from immediately becoming invalid. Validators are simply functions, no CPs or observers required. Try clearing the inputs below, entering invalid values, or even just focusing out. Email is an async validation.</p>
<p>
	Reserved emails: {{#each reservedEmails as |email|}}
  <code>{{email}}</code>
{{/each}}
</p>

templates.components.validated-field.hbs

<label for={{concat type "-" property}}>{{property}}</label>
<input
  class="u-full-width"
  type={{type}}
  id={{concat type "-" property}}
  value={{get changeset property}}
  oninput={{action (mut (get changeset property)) value="target.value"}}
  onblur={{action validateProperty}}>
{{#if (get changeset.error property)}}
  <small>
  	<ul>
    	{{#each (get (get changeset.error property) "validation") as |message|}}
    		<li>{{message}}</li>
    	{{/each}}
    </ul>
  </small>
{{/if}}

twiddle.json

{
  "version": "0.10.4",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.10.2",
    "ember-data": "2.10.0",
    "ember-template-compiler": "2.10.2",
    "skeleton-css": "https://cdnjs.cloudflare.com/ajax/libs/skeleton/2.0.4/skeleton.min.css"
  },
  "addons": {
    "ember-changeset-validations": "1.2.4",
    "ember-one-way-controls": "0.8.3"
  }
}

validations.adult.js

import Ember from 'ember';
import { validateNumber } from 'ember-changeset-validations/validators';
import UserValidations from './user';

const { assign } = Ember;

export default assign({}, UserValidations, {
  age: validateNumber({ gte: 18 })
});

validations.child.js

import Ember from 'ember';
import { validateNumber } from 'ember-changeset-validations/validators';
import UserValidations from './user';

const { assign } = Ember;

export default assign({}, UserValidations, {
  age: validateNumber({ lt: 18 })
});

validations.user.js

import { 
  validatePresence, 
  validateLength,
  validateFormat
} from 'ember-changeset-validations/validators';
import validateUniqueness from '../validators/uniqueness';

export default {
  firstName: [
    validatePresence(true),
    validateLength({ min: 2 })
  ],
  lastName: [
    validatePresence(true),
    validateLength({ min: 2 })
  ],
  email: [
    validateUniqueness(),
    validateFormat({ type: 'email' })
  ],
  job: validatePresence(true)
}

validators.uniqueness.js

import Ember from 'ember';

const { RSVP: { Promise } } = Ember;
export const reservedEmails = ['foo@bar.com', 'admin@example.com'];

export default function validateUniqueness() {
  return (key, newValue, oldValue, changes) => {
    return new Ember.RSVP.Promise((resolve) => {
   	  Ember.run.debounce(this, loadData, resolve, newValue, 3000);
    });
  };
}

function loadData(resolve, newValue) {
    let isAvailable = reservedEmails.indexOf(newValue) === -1;
  return resolve(isAvailable || 'is taken');
}