Sequelize Update Return Data
Updates all instances that match a query.
Sequelize update return data. This means that after the database returns the results sequelize automatically wraps everything in proper instance objects. Like findorcreate it returns a promise for an array. You can store your model definitions in a single file using the sequelize import method. Hooks also known as lifecycle events are functions which are called before and after calls in sequelize are executed.
Please just use require instead. The first element is always the number of affected rows while the second element is the actual affected rows only supported in postgres with options returning true. In a few cases when there are too many results this wrapping can be inefficient. This means that if you don t change anything and call save sequelize will know that the save is superfluous and do nothing i e no query will be generated it will still return a promise but it will resolve immediately.
Results will be an empty array and metadata will contain the number of affected rows. The save method is optimized internally to only update fields that really changed. For example if you want to always set a value on a model before saving it you can add a beforeupdate hook. The first element of the array is the number of rows that were affected.
The documentation is confusing and there are not many outside resources. You should not use sequelize import. Jsdoc update multiple instances that match the where options. This documentation has been kept just in case you really need to maintain old code that uses it.
Today i am going to. Same problem faced by me. You can t use hooks with instances. Hooks are used with models.
Const results metadata await sequelize query update users set y 42 where x 12. In cases where you don t need to access the metadata you can pass in a query type to tell sequelize how to format the results.