removeAttribute('id') results in undefined: null data value

[broofa]

Removing the id property results in an "undefined" property being set on the dataValues object.

> var Thing = db.sequelize.define('Thing')

> console.log(model.build().dataValues)
{ id: null }

> model.removeAttribute('id')

> console.log(model.build().dataValues)
{ undefined: null }

> model.build().toJSON()
{ undefined: null }

Dialect: mysql
Database version: mysql Ver 14.14 Distrib 5.7.16, for osx10.11 (x86_64) using EditLine wrapper
Sequelize version: 3.30.2

[sushantdhiman]

Its a bug, with very low priority.

SSCCE

const Entry = sequelize.define('Entry', {
  description: {
    type: Sequelize.STRING
  },
  value: {
    type: Sequelize.DECIMAL(17, 2),
    allowNull: false
  }
});

let instance = Entry.build({ description: 'Hello', value: 23 });
console.log(instance.toJSON());

Entry.removeAttribute('value');
instance = Entry.build({ description: 'Hello', value: 23 });
console.log(instance.toJSON());

Entry.removeAttribute('description');
Entry.removeAttribute('id');
instance = Entry.build({});
console.log(instance.toJSON());

OUTPUT

{ id: null, description: 'Hello', value: 23 }
{ id: null, description: 'Hello' }
{ undefined: null }

[sushantdhiman]

Fixed in #7382

[ratulSharker]

I'm still facing this issue. Removed id using Model.removeAttribute(id), then including hasMany association causes null values to appear.