Does Sequelize support Insert on duplicate key update?

node.js, sequelize.js

Solution

they have recently added this feature `upsert` or `insertOrUpdate`

  /** 
  * Insert or update a single row. An update will be executed if a row
  * which matches the supplied values on either the primary key or a unique
  * key is found. Note that the unique index must be defined in your sequelize
  * model and not just in the table. Otherwise you may experience a unique 
  * constraint violation, because sequelize fails to identify the row that
  * should be updated.
  */

  Model.upsert({uniqueKey: 1234, name: 'joe'}).then(function () {
        // cheer for joy
  });

Problem

Is there a Model or Instance method that will perform an insert or update, depending on the whether or not the record exists? Preferably making use of MySQL's "INSERT ON DUPLICATE KEY UPDATE" syntax?

Original source