module.exports = {

  up  : function (queryInterface, Sequelize) {

    return queryInterface

      .changeColumn(tableName, 'status', {

        type: Sequelize.ENUM('a', 'b', 'c', 'd'),

        allowNull: false

      });

  },

  down: function (queryInterface, Sequelize) {

    return queryInterface

      .changeColumn(tableName, 'status', {

        type: Sequelize.ENUM('a', 'b', 'c'),

        allowNull: false

      });

  }

};