在邮递员中获取未知列，而无需使用代码中的列名

Question

我试图创建一个节点，进行序列化，表示后端，并且我的数据库位于mysql 8中。我正在用邮递员测试路由。 我总是在邮递员那里得到的答复是

"error: SequelizeDatabaseError: Unknown column 'createdAt' in 'field list'"

我仔细检查了所有代码，并且在项目的任何文件中均未出现“ createdAt”。

编辑：

//config.json
"development": {
  "username": "user",
  "password": "Password",
  "database": "library",
  "host": "127.0.0.1",
  "dialect": "mysql"
}

//route.js
users.post("/register", (req, res) => {
  const today = new Date();
  const userData = {
      username: req.body.user_name,
      password: req.body.password,
      role: req.body.role,
      created: today
  }
  User.findOne({
        where: {
            username: req.body.username
        }
    })
  });


//connection.js
const sequelize = new Sequelize("library", "user", "Password",{
  host: 'localhost',
  dialect: "mysql",
  operatorsAliases: false,

  poll: {
      max: 5,
      min: 0,
      acquire: 30000,
      idle: 10000
  }
});



//model.js
module.exports = db.sequelize.define(
    "user",
    {
        id:{
            type: Sequelize.INTEGER(11),
            primaryKey: true,
            autoIntrement: true
        },
        username:{
            type: Sequelize.STRING(35),
            allowNull: false,
            unique: true
        },
        password: {
            type: Sequelize.STRING(35),
            allowNull: false
        },
        role:{
            type: Sequelize.INTEGER(11)
        },
        created:{
            type: Sequelize.DATE,
            defaultValue: Sequelize.NOW
        }
   }
)

这可能是什么？