text: 
  'use strict';
  
  module.exports = {
    up: function (queryInterface, Sequelize) {
        return  queryInterface.addColumn( 'Comments', 
                                          'AuthorId', 
                                          { type: Sequelize.INTEGER,
                                            defaultValue : 0
                                          }
                                        );
    },
  
    down: function (queryInterface, Sequelize) {
        return queryInterface.removeColumn('Comments','AuthorId');
    }
  };
  