Method transaction

src/sequelize.js:1178–1211

* Start a transaction. When using transactions, you should pass the transaction in the options argument in order for the query to happen under that transaction @see Transaction * * If you have [CLS](https://github.com/Jeff-Lewis/cls-hooked) enabled, the transaction will automatically b

(options, autoCallback)

   * @returns {Promise}
   */
  async transaction(options, autoCallback) {
    if (typeof options === 'function') {
      autoCallback = options;
      options = undefined;
    }

    const transaction = new Transaction(this, options);

    if (!autoCallback) {
      await transaction.prepareEnvironment(/* cls */ false);
      return transaction;
    }

    // autoCallback provided
    return Sequelize._clsRun(async () => {
      await transaction.prepareEnvironment(/* cls */ true);

      let result;
      try {
        result = await autoCallback(transaction);
      } catch (err) {
        try {
          await transaction.rollback();
        } catch (ignore) {
          // ignore, because 'rollback' will already print the error before killing the connection
        }

        throw err;
      }

      await transaction.commit();
      return result;
    });
  }

  /**
   * Use CLS (Continuation Local Storage) with Sequelize. With Continuation