Sequelize v6 is the next major release after v5

Breaking Changes

Support for Node 10 and up

Sequelize v6 will only support Node 10 and up #10821

CLS

You should now use cls-hooked package for CLS support.

  const cls = require('cls-hooked');
  const namespace = cls.createNamespace('....');
  const Sequelize = require('sequelize');

  Sequelize.useCLS(namespace);

Bluebird now supports async_hooks. This configuration will automatically be enabled when invoking Sequelize.useCLS. Thus all promises should maintain CLS context without cls-bluebird patching.

Model

options.returning

Option returning: true will no longer return attributes that are not defined in the model. Old behavior can be restored by using returning: ['*']

Model.changed()

This method now tests for equality with _.isEqual and is now deep aware. Modifying nested value for JSON object won't mark them as changed, because it is still the same object.

  const instance = await MyModel.findOne();

  instance.myJsonField.a = 1;
  console.log(instance.changed()) => false

  await instance.save(); // this will not save anything

  instance.changed('myJsonField', true);
  console.log(instance.changed()) => ['myJsonField']

  await instance.save(); // will save

Changelog

6.0.0-beta.3

• feat: support cls-hooked / tests #11584

6.0.0-beta.2

• feat(postgres): change returning option to only return model attributes #11526
• fix(associations): allow binary key for belongs-to-many #11578
• fix(postgres): always replace returning statement for upsertQuery
• fix(model): make .changed() deep aware #10851
• change: use node 10 #11580