Sequelize:如何将字段定义为函数？

const { Sequelize, DataTypes } = require('sequelize');

const sequelize = new Sequelize('database', 'username', 'password', {
  host: 'localhost',
  dialect: 'mysql'
});

const User = sequelize.define('User', {
  firstName: {
    type: DataTypes.STRING,
    allowNull: false
  },
  lastName: {
    type: DataTypes.STRING,
    allowNull: false
  },
  fullName: {
    type: DataTypes.VIRTUAL,
    get() {
      return `${this.firstName} ${this.lastName}`;
    }
  }
});

(async () => {
  await sequelize.sync({ force: true });

  const user = await User.create({ firstName: 'John', lastName: 'Doe' });
  console.log(user.fullName); // 输出：John Doe
})();