Ember CP Validations

A Ruby on Rails inspired model validation framework that is completely and utterly computed property based.

Features

No observers were used nor harmed while developing and testing this addon.

Lazily computed validations
Ruby on rails inspired validators
Support for both Ember Data Models and Objects
Synchronous and asynchronous support for both validators and validations
Dirty tracking
Support for nested models via belongsTo and hasMany relationships
Support for nested objects
Easily integrated with Ember Data's DS.Errors
No observers. Seriously... there are none. Like absolutely zero....
Meta data based cycle tracking to detect cycles within your model relationships which could break the CP chain
Custom validators
Ember CLI generator to create custom validators with a unit test
Debounceable validations
I18n support

Installation

ember install ember-cp-validations

Helpful Links

Looking for help?

If it is a bug please open an issue on GitHub.

Basic Usage - Models

The first thing we need to do it build our validation rules. This will then generate a Mixin that you will be able to incorporate into your model or object.

// models/user.js

import Ember from 'ember';
import DS from 'ember-data';
import {
  validator, buildValidations
}
from 'ember-cp-validations';

const Validations = buildValidations({
  username: validator('presence', true),
  password: [
    validator('presence', true),
    validator('length', {
      min: 4,
      max: 8
    })
  ],
  email: [
    validator('presence', true),
    validator('format', { type: 'email' })
  ],
  emailConfirmation: [
    validator('presence', true),
    validator('confirmation', {
      on: 'email',
      message: '{description} do not match',
      description: 'Email addresses'
    })
  ]
});

Once our rules are created and our Mixin is generated, all we have to do is add it to our model.

// models/user.js

export default DS.Model.extend(Validations, {
  'username': attr('string'),
  'password': attr('string'),
  'email': attr('string')
});

Basic Usage - Objects

You can also use the generated Validations mixin on any Ember.Object or child of Ember.Object, like Ember.Component. For example:

// components/x-foo.js

import Ember from 'ember';
import {
  validator, buildValidations
}
from 'ember-cp-validations';

const Validations = buildValidations({
  bar: validator('presence', true)
});

export default Ember.Component.extend(Validations, {
  bar: null
});

To lookup validators, container access is required which can cause an issue with Ember.Object creation if the object is statically imported. The current fix for this is as follows.

// models/user.js

export default Ember.Object.extend(Validations, {
  username: null
});

Ember < 2.3.0-beta.1

// routes/index.js

import User from '../models/user';

export default Ember.Route.extend({
  model() {
    var container = this.get('container');
    return User.create({ username: 'John', container })
  }
});

Ember >= 2.3.0-beta.2

// routes/index.js
import Ember from 'ember';
const { getOwner } = Ember;

import User from '../models/user';

export default Ember.Route.extend({
  model() {
    return User.create(
     getOwner(this).ownerInjection(),
     { username: 'John' }
    );
  }
});

Advanced Usage

Default Options

Default options can be specified over a set of validations for a given attribute. Local properties will always take precedence.

Instead of doing the following:

const Validations = buildValidations({
  username: [
    validator('presence', {
      presence: true,
      description: 'Username'
    }),
    validator('length', {
      min: 1,
      description: 'Username'
    }),
    validator('no-whitespace-around', {
      description: 'A username'
    })
  ]
});

We can declare default options:

const Validations = buildValidations({
  username: {
    description: 'Username'
    validators: [
      validator('presence', true),
      validator('length', {
        min: 1
      }),
      validator('no-whitespace-around', {
        description: 'A username'
      })
    ]
  },
});

In the above example, all the validators for username will have a description of Username except that of the no-whitespace-around validator which will be A username.

Options as Functions

All options can be functions which are processed lazily before validate is called. These functions are passed the model and attribute that is associated with the validator while also given that as their context, giving you access to all its properties.

Please note that the message option of a validator has its own signature.

const Validations = buildValidations({
  dob: validator('date', {
    description: 'Date of Birth',
    format(model, attribute) {
      return this.get('model.meta.date.format');
    },
    before(model, attribute) {
      return moment();
    },
    after(model, attribute) {
      return moment().subtract(120, 'years');
    }
  })
});

Nested Keys

When declaring object validations (not including Ember Data models), it is possible to validate child objects from the parent object.

import Ember from 'ember';
import { validator, buildValidations } from 'ember-cp-validations';

const Validations = buildValidations({
  'acceptTerms': validator('inclusion', { in: [ true ] }),
  'user.firstName': validator('presence', true),
  'user.lastName': validator('presence', true),
  'user.account.number': validator('number')
});

export default Ember.Component.extend(Validations, {
  acceptTerms: false,
  user:  {
    firstName: 'John',
    lastName: 'Doe' ,
    account: {
      number: 123456,
    }
  },
  isFormValid: Ember.computed.alias('validations.isValid'),
});

jcowley/ember-cp-validations