New Twiddle

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')) {
            return changeset.execute();
          }
        }).catch(() => {
          changeset.restore(snapshot);
        });
    },
    
    reset(changeset) {
      return changeset.rollback();
    },
    
    validateProperty(changeset, property) {
      return changeset.validate(property);
    }
  }
});

models.user.js

import Model from 'ember-data/model';
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 Model.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',
      age: 10
    });  
  }
});

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|}}

<label for={{concat type "-" property}}>{{property}}</label>
<input
  class="u-full-width"
  type="text"
  id="firstName"
  value={{changeset.firstName}}
  oninput={{action (mut changeset.firstName) value="target.value"}}>
{{#if (get changeset.error "firstName")}}
  <small> 
  	<ul>
    	{{#each (get (get changeset.error "firstName") "validation") as |message|}}
    		<li>{{message}}</li>
    	{{/each}}
    </ul>
  </small>
{{/if}}
  
	<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": "0.11.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "1.13.13",
    "ember-data": "1.13.15",
    "ember-template-compiler": "1.13.13",
    "ember-testing": "1.13.13",
    "skeleton-css": "https://cdnjs.cloudflare.com/ajax/libs/skeleton/2.0.4/skeleton.min.css"
  },
  "addons": {
    "ember-changeset-validations": "1.2.2",
    "ember-get-helper": "1.1.0",
    "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 } = Object;

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 } = Object;

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

export default function validateUniqueness() {
  return (key, newValue, oldValue, changes) => {
    let isAvailable = reservedEmails.indexOf(newValue) === -1;
    
  	return resolve(isAvailable || 'is taken');
  };
}