foam-framework/js/foam/core/dao/CascadingRemoveDAO.js

MVC metaprogramming framework

/*
 * @license
 * Copyright 2015 Google Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

CLASS({
  name: 'CascadingRemoveDAO',
  help: "Removes dependent children from a secondary DAO when a parent is removed from the delegate.",
package: 'foam.core.dao',
  label: 'Cascading Remove DAO',

  extends: 'foam.dao.ProxyDAO',

  properties: [
    {
      name: 'childDAO',
      type: 'DAO',
      mode: "read-only",
      hidden: true,
      required: true,
      transient: true
    },
    {
      name: 'property',
      type: 'Property',
      required: true,
      hidden: true,
      transient: true
    }
  ],

  methods: {
    remove: function(query, sink) {
      this.childDAO.where(EQ(this.property, query)).removeAll();
      this.delegate.remove(query, sink);
    },
    removeAll: function(sink, options) {
      return apar(
        this.childDAO.removeAll(null, options), // TODO: Sane?
        this.delegate.removeAll(sink, options)
      );
    }
  }
});