Generating User with Sequelize CLI

user.js

module.exports = function(sequelize, DataTypes) {
  var User = sequelize.define('User', {
    firstName: DataTypes.STRING,
    lastName: DataTypes.STRING,
    email: DataTypes.STRING,
    password: DataTypes.STRING,
    isVerified: DataTypes.BOOLEAN
  }, {
    classMethods: {
      associate: function(models) {
       User.hasOne(models.VerificationToken, {
            as: 'verificationtoken',
            foreignKey: 'userId',
            foreignKeyConstraint: true,
          });
      }
    }
  });
  return User;
};