Translated attribute for ember-data

localized-transform.js

import Transform from 'ember-data/transform';

export default Transform.extend({
  deserialize(serialized) {
    return Ember.Object.create(serialized);
  },

  serialize(deserialized) {
    return deserialized;
  }
});

translated-attribute.js

import Ember from 'ember';

const {
  computed
} = Ember;

/**
 * translatedAttribute - Creates a translated version of the given attribute.
 * The locale used to be get/set must be provided on the `_locale` property of
 * the model.
 *
 * ```js
 * import Model from 'ember-data/model';
 * import translated from 'admin/utils/translated-attribute';
 * import { attr } from 'ember-computed-decorators/ember-data';
 *
 * export default Model.extend({
 *   // Attributes
 *   //
 *   @attr('string') slug,
 *   @attr('localized') titleTranslations,
 *   @attr('localized') contentTranslations,

 *   // Translations
 *   //
 *   _locale: 'en',
 *   @translated('title') title,
 *   @translated('content') pageContent
 * });
 * ```
 *
 * @param  {String} attribute source attribute
 * @public
 */
export default function translatedAttribute(attribute) {
  return function(target, key, descriptor) {
    let translationsKey = `${attribute}Translations`;

    return {
      enumerable:   descriptor.enumerable,
      configurable: descriptor.configurable,
      writable:     descriptor.writable,
      initializer() {
        return computed('_locale', translationsKey, {
          get() {
            let locale = this.get('_locale');
            return this.get(`${translationsKey}.${locale}`);
          },

          set(name, value) {
            let current = this.get(translationsKey);
            if (!current) {
              this.set(translationsKey, Ember.Object.create());
            }
            let locale = this.get('_locale');
            let result = this.set(`${translationsKey}.${locale}`, value);
            this.notifyPropertyChange(translationsKey);
            return result;
          }
        });
      }
    };
  };
}