drupal/core/modules/quickedit/js/models/BaseModel.js

/**
 * @file
 * A Backbone Model subclass that enforces validation when calling set().
 */

(function (Backbone) {

  "use strict";

  Drupal.quickedit.BaseModel = Backbone.Model.extend({

    /**
     * {@inheritdoc}
     */
    initialize: function (options) {
      this.__initialized = true;
      return Backbone.Model.prototype.initialize.call(this, options);
    },

    /**
     * {@inheritdoc}
     */
    set: function (key, val, options) {
      if (this.__initialized) {
        // Deal with both the "key", value and {key:value}-style arguments.
        if (typeof key === 'object') {
          key.validate = true;
        }
        else {
          if (!options) {
            options = {};
          }
          options.validate = true;
        }
      }
      return Backbone.Model.prototype.set.call(this, key, val, options);
    }

  });

}(Backbone));