title: "dataValues" is not allowed by JOI.validate()
body: <p>Here is code for <code>User</code> model with JOI (14.3) validation. The code used to be working when creating new user but it seems got flu recently and throws out error of <code>xxx not allowed</code>:</p>
  
  <pre><code>require('dotenv').config({path: process.cwd() +'\\config\\.env'});
  const jwt = require('jsonwebtoken');
  const moment = require('moment');
  const Joi = require('joi');
  const Sql = require('sequelize');
  const db = require("../startup/db");
  
  const User = db.define('user', {
      name: {type: Sql.STRING,
             allowNull: false,
             min: 2,
             max: 50,
      },
      email: {type: Sql.STRING,
              isEmail: true
      },      
      cell: {type: Sql.STRING,
              allowNull: false,
              min: 10,
              max: 20,
      },
      cell_country_code: {type: Sql.STRING,
                          allowNull: false
      },
      comp_name: {type: Sql.STRING
      },
      status: {type: Sql.STRING,
               allowNull: false,
               isIn: ['active', 'blocked', 'inactive', 'pending', 'unverified']
      },
      role: {type: Sql.STRING,
             allowNull: false
      },
      device_id: {type: Sql.STRING,   //maybe empty when the user is initially created.
      },
      user_data: {type: Sql.JSONB
      },
      last_updated_by_id: {type: Sql.INTEGER},
      fort_token: {type: Sql.STRING,
                   allowNull: false,
                   min: 20  //64 for production
      },
      createdAt: Sql.DATE,
      updatedAt: Sql.DATE
    }, {
  
      indexes: [
        { 
          //For same fort_token, name to be unique
          unique: true,
          fields: ['name', 'fort_token']
        }, {
          //unique cell
          //unique: true,
          fields: ['cell_country_code', 'cell', 'status']
        }, {
          fields: ['cell_country_code', 'cell']
        }, {
          //email
          fields: ['email']
        }, {
          fields: ['device_id']
        }, {
          fields: ['status']
        }, {
          fields: ['fort_token']
        }
      ]   
  
    });
  
  function validateUser(user) {
      const schema = {
          name: Joi.string()
          .min(2)
          .max(50)
          .required()
          .trim(),
      cell: Joi.string()
          .min(10)
          .max(20)
          .trim()
          .required()
          .error(new Error('该手机号有误！')),
      cell_country_code: Joi.string()
          .trim()
          .required(),
      role: Joi.string()
          .required()
          .trim(),
      email: Joi.string()
          .email()
          .allow("")
          .optional()
      };
  
      return Joi.validate(user, schema);
  };
  </code></pre>
  
  <p>Here is the error:</p>
  
  <pre><code>new user data :  { _device_id: '8c9c25711c7d0262',
    cell: '8008006414 ',
    cell_country_code: '1',
    name: 'ss9',
    corp_name: '',
    role: 'eventer',
    email: '',
    user_data: { avatar: '' } }
  error in user validate :  { ValidationError: "dataValues" is not allowed. "_previousDataValues" is not allowed. "_changed" is not allowed. "_modelOptions" is not allowed. "_options" is not allowed. "isNewRecord" is not allowed
      at Object.exports.process (C:\d\code\js\emps_bbone\node_modules\joi\lib\errors.js:203:19)
      at internals.Object._validateWithOptions (C:\d\code\js\emps_bbone\node_modules\joi\lib\types\any\index.js:764:31)
      at module.exports.internals.Any.root.validate (C:\d\code\js\emps_bbone\node_modules\joi\lib\index.js:147:23)
      at validateUser (C:\d\code\js\emps_bbone\models\user.js:106:16)
      at router.post (C:\d\code\js\emps_bbone\routes\users.js:217:27)
      at newFn (C:\d\code\js\emps_bbone\node_modules\express-async-errors\index.js:16:20)
      at Layer.handle [as handle_request] (C:\d\code\js\emps_bbone\node_modules\express\lib\router\layer.js:95:5)
      at next (C:\d\code\js\emps_bbone\node_modules\express\lib\router\route.js:137:13)
      at C:\d\code\js\emps_bbone\middleware\auth_role.js:7:7
      at newFn (C:\d\code\js\emps_bbone\node_modules\express-async-errors\index.js:16:20)
      at Layer.handle [as handle_request] (C:\d\code\js\emps_bbone\node_modules\express\lib\router\layer.js:95:5)
      at next (C:\d\code\js\emps_bbone\node_modules\express\lib\router\route.js:137:13)
      at module.exports (C:\d\code\js\emps_bbone\middleware\auth_userinfo.js:106:13)
    isJoi: true,
    name: 'ValidationError',
    details:
     [ { message: '"dataValues" is not allowed',
         path: [Array],
         type: 'object.allowUnknown',
         context: [Object] },
       { message: '"_previousDataValues" is not allowed',
         path: [Array],
         type: 'object.allowUnknown',
         context: [Object] },
       { message: '"_changed" is not allowed',
         path: [Array],
         type: 'object.allowUnknown',
         context: [Object] },
       { message: '"_modelOptions" is not allowed',
         path: [Array],
         type: 'object.allowUnknown',
         context: [Object] },
       { message: '"_options" is not allowed',
         path: [Array],
         type: 'object.allowUnknown',
         context: [Object] },
       { message: '"isNewRecord" is not allowed',
         path: [Array],
         type: 'object.allowUnknown',
         context: [Object] } ],
    _object:
     user {
       dataValues:
        { id: null,
          name: 'ss9',
          cell: '8008006414',
          cell_country_code: '1',
          email: '',
          role: 'eventer' },
       _previousDataValues:
        { name: undefined,
          cell: '8008006414 ',
          cell_country_code: undefined,
          email: undefined,
          role: undefined },
       _changed:
        { name: true,
          cell: true,
          cell_country_code: true,
          email: true,
          role: true },
       _modelOptions:
        { timestamps: true,
          validate: {},
          freezeTableName: false,
          underscored: false,
          paranoid: false,
          rejectOnEmpty: false,
          whereCollection: [Object],
          schema: null,
          schemaDelimiter: '',
          defaultScope: {},
          scopes: {},
          indexes: [Array],
          name: [Object],
          omitNull: false,
          sequelize: [Sequelize],
          hooks: {} },
       _options: { isNewRecord: true, _schema: null, _schemaDelimiter: '' },
       isNewRecord: true },
    annotate: [Function] }
  error in new user
  </code></pre>
  
  <p>Here is the code for creating new user:</p>
  
  <pre><code>try {
          user = new User(_.pick(req.body, ["name", "cell", "cell_country_code", "email", "role" ]));
          const { error } = validateUser(user);  //&lt;&lt;====== throws error with JOI.validate()
          console.log("error in user validate : ", error);
          if (error) {console.log("error in new user "); return res.status(400).send(error.details[0].message)};
  </code></pre>
  
  <p>I have no clue what the validation error is about. </p>