seepur/app/Utils/UserUtils.js

const User = use('App/Models/User');
const UserChildUtils = use('App/Utils/UserChildUtils');

class UserUtils {

    static async deleteUser(user_id) {
        const user = await User.find(user_id)
        let userLinks = await user.links().fetch();

        //my links
        const links = userLinks.rows;

        //children and children links
        const childrenLinks = links.filter(l => l.is_parent)

        for (const link of childrenLinks) {
            await UserChildUtils.deleteChild(link.child_id)
        }

        const promises = [...links.map(l => (l.delete())), user.delete()];
        return await Promise.all(promises);
    }
}

module.exports = UserUtils;