Node sequelize audit log

audit-log.js

const AuditLog = auditLogDb.define('audit-log', {
  userId: {
    type: Sequelize.DataTypes.INTEGER,
    allowNull: true,
  },
  actionType: {
    type: Sequelize.DataTypes.STRING,
    allowNull: false,
  },
  table: {
    type: Sequelize.DataTypes.STRING,
    allowNull: false,
  },
  prevValues: {    
    type: Sequelize.DataTypes.TEXT,
    allowNull: false,
  },
  newValues: {
    type: Sequelize.DataTypes.TEXT,
    allowNull: false,
  }
}, {  
  updatedAt: false,
});

const options = {
  hooks: {
    afterCreate: (instance, options) => {
      saveAuditLog('create', instance, options)
    },
    afterUpdate: (instance, options) => {
      saveAuditLog('update', instance, options);
    },
  }
};

function saveAuditLog(action, model, options) {
  AuditLog.create({
    userId: options.userId,
    actionType: action,
    table: model._modelOptions.name.plural,
    prevValues: JSON.stringify(_.pick(model._previousDataValues, model.attributes)),
    newValues: JSON.stringify(_.pick(model.dataValues, model.attributes)),
  });
}