discourse/app/assets/javascripts/discourse/mixins/user-fields-validation.js.es6

import InputValidation from 'discourse/models/input-validation';
import { on, default as computed } from 'ember-addons/ember-computed-decorators';

export default Ember.Mixin.create({

  @on('init')
  _createUserFields() {
    if (!this.site) { return; }

    let userFields = this.site.get('user_fields');
    if (userFields) {
      userFields = _.sortBy(userFields, 'position').map(function(f) {
        return Ember.Object.create({ value: null, field: f });
      });
    }
    this.set('userFields', userFields);
  },

  // Validate required fields
  @computed('userFields.@each.value')
  userFieldsValidation() {
    let userFields = this.get('userFields');
    if (userFields) { userFields = userFields.filterBy('field.required'); }
    if (!Ember.isEmpty(userFields)) {
      const anyEmpty = userFields.any(uf => {
        const val = uf.get('value');
        return !val || Ember.isEmpty(val);
      });
      if (anyEmpty) {
        return InputValidation.create({ failed: true });
      }
    }
    return InputValidation.create({ ok: true });
  }
});