Vulcan/packages/vulcan-getting-started/lib/getting_started.js

import Posts from "meteor/vulcan:posts";
import Comments from "meteor/vulcan:comments";
import Users from 'meteor/vulcan:users';
import { addCallback } from 'meteor/vulcan:core';

Users.addField({
  fieldName: 'isDummy',
  fieldSchema: {
    type: Boolean,
    optional: true,
    hidden: true // never show this
  }
});

Posts.addField({
  fieldName: 'dummySlug',
  fieldSchema: {
    type: String,
    optional: true,
    hidden: true // never show this
  }
});

Posts.addField({
  fieldName: 'isDummy',
  fieldSchema: {
    type: Boolean,
    optional: true,
    hidden: true // never show this
  }
});

Comments.addField({
  fieldName: 'isDummy',
  fieldSchema: {
    type: Boolean,
    optional: true,
    hidden: true // never show this
  }
});

/**
 * @summary Copy over profile.isDummy to isDummy on user creation
 * @param {Object} user – the user object being iterated on and returned
 * @param {Object} options – user options
 */
function copyDummyProperty (user, options) {
  if (typeof user.profile.isDummy !== "undefined") {
    user.isDummy = user.profile.isDummy;
  }
  return user;
}
addCallback("users.new.sync", copyDummyProperty);