kendo-backbone/lib/collectionadapter.js

Bind a Backbone.Collection to a Kendo DataSource

"use strict";

var _ = require('lodash');
var Backbone = require('backbone');

// Backbone.Collection Adapter
// ---------------------------
//
// INTERNAL TYPE
//
// Wrap a Collection with DataSource configuration so that
// the two-way integration can occur without infinite loops

// Constructor function
function Adapter(collection, dataSource){
  this.collection = collection;
  this.dataSource = dataSource;

  this.listenTo(this.collection, "add", this._addToDataSource);
  this.listenTo(this.collection, "remove", this._removeFromDataSource);
  this.listenTo(this.collection, "reset", this._resetDataSource);
}

// Instance methods
_.extend(Adapter.prototype, Backbone.Events, {
  create: function(data, cb){
    if (this.addFromCol){
      // gate the add that came through the collection directly
      cb(data);
    } else {
      this.addFromDS = true;

      // ensure the id is cleared out, not just
      // an empty string
      if (!data.id) {
        data.id = null;
      }

      // add the model to the collection, and
      // for the return so that we can get the
      // id from the new model, and send it to
      // the datasource
      this.collection.create(data, {
        wait: true,
        success: function(model){
          cb(model.toJSON());
        }
      });

      this.addFromDS = false;
    }
  },

  _addToDataSource: function(model){
    // gate the add that came through the datasource directly
    if (!this.addFromDS){
      this.addFromCol = true;

      var data = model.toJSON();
      this.dataSource.add(data);

      this.addFromCol = false;
    }
  },

  _removeFromDataSource: function(model){
    var dsModel = this.dataSource.get(model.id);

    if (dsModel){
      this.dataSource.remove(dsModel);
    }
  },

  _resetDataSource: function(){
    this.dataSource.read();
  }
});

module.exports = Adapter;