What's New in Mongoose 5.10: Improved Transactions

The primary goal of a transaction is to let you update multiple documents in MongoDB in isolation, and potentially undo all the updates if some error occurs by aborting the transaction.

Mongoose 5.10.0 was released on August 14, 2020. Mongoose 5.10 is a semver minor version that introduces several important new features. In this article, I'll describe what is arguably the most important new feature: the [Connection#transaction()](https://mongoosejs.com/docs/api/connection.html#connection_Connection-transaction) function, which improves Mongoose's support for MongoDB transactions.

Why Mongoose Needs a Transaction Wrapper

The primary goal of a transaction is to let you update multiple documents in MongoDB in isolation, and potentially undo all the updates if some error occurs by aborting the transaction. For example, if you start a transaction and insert two documents, calling abortTransaction() makes it so neither of the documents end up in the database:

const session = await Customer.startSession();
session.startTransaction();

// Passing the `session` option is how you indicate that `create()` is part of a transaction
await Customer.create([{ name: 'Test' }], { session: session });
await Customer.create([{ name: 'Test2' }], { session: session });

await session.abortTransaction();

const count = await Customer.countDocuments();
count; // 0, no documents were inserted, because the transaction was aborted.

Sessions have a convenient withTransaction() function that handles aborting the transaction if an error occurs. For example, the below code shows that the withTransaction() function successfully undoes any changes when the transaction executor function throws an error.

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