Sequelize migration file default value

I am creating a custom id which I named “rid” instead of using the default id and I have all set up in my Article.js(Article model) like this:

'use strict';
const {nanoid} = require('nanoid');

module.exports = (sequelize, DataTypes) => {
    const Article = sequelize.define('Article', {
        rid:{
            type: DataTypes.STRING,
            primaryKey:true,
            allowNull: false,
            unique:true,
            defaultValue: () => {
                const randomId = nanoid(15);
                return randomId;
            }
        },
        title: DataTypes.STRING,
        author: DataTypes.STRING,
        body: DataTypes.TEXT,
    });

    return Article;
};

but here is the problem, because I also have a migration file name " xxxxxxxxxx-create-article.js" so I also need to set up it using my custom id(rid), which I have done but for “defaultValue” in xxxxxxxxxx-create-article.js file, I don’t know what value to set, here is my xxxxxxxxxx-create-article.js (Article migration file):

'use strict';
module.exports = {
    up: async (queryInterface, Sequelize) => {
        return await queryInterface.createTable('Articles', {
            rid: {
                type: Sequelize.STRING,
                primaryKey: true,
                allowNull: false,
                unique: true,
                defaultValue: /* What value do I set here?? */
            },
            title: {
                type: Sequelize.STRING,
            },
            author: {
                type: Sequelize.STRING,
            },
            body: {
                type: Sequelize.TEXT,
            },
            createdAt: {
                allowNull: false,
                type: Sequelize.DATE,
            },
            updatedAt: {
                allowNull: false,
                type: Sequelize.DATE,
            },
        });
    },
    down: async (queryInterface, Sequelize) => {
        return await queryInterface.dropTable('Articles');
    },
};