Default columns with a bookshelf collection

collection.js

var ModelBase = Bookshelf.Model.extend();

var CollectionBase = Bookshelf.Collection.extend({
  toJSON: function () {
    var json = Bookshelf.Collection.toJSON.apply(this, arguments);
    json.object = this.model.prototype.object;
    return json;
  });
});

Model.collection = function (models, options) {
  return new CollectionBase(models || [], _.extend(options, {model: this}));
};