Easy way to handle nested transactions
If you use CLS, a very simple helper function will do the work.
const cls = require('continuation-local-storage');
const Sequelize = require('sequelize');
const NAMESPACE = 'your-namespace';
// Use CLS for Sequelize
Sequelize.cls = cls.createNamespace(NAMESPACE);
const sequelize = new Sequelize(...);
/* * * * * * * * * * * * * * * * * * * * *
* THE MAGIC: Create a transaction wrapper
* * * * * * * * * * * * * * * * * * * * */
function transaction(task) {
return cls.getNamespace(NAMESPACE).get('transaction') ? task() : sequelize.transaction(task);
};
/* * * * * * * * * * * * * * * * * * * * *
* Your code below
* * * * * * * * * * * * * * * * * * * * */
function addUser(userName, password) {
return transaction(function() {
return AccountModel
.create(...)
.then(() => UserModel.create(...));
});
}
function addTeam() {
return transaction(function() {
return TeamModel
.create(...)
.then(() => addUser(...));
});
}sequelize.transaction accepts an options object - If options.transaction is set, this will create a savepoint in the transaction (provided that the SQL dialects supports it), otherwise it will create a new transaction
http://docs.sequelizejs.com/en/latest/api/sequelize/#transactionoptions-promise
So you should be able to do simply
sequelize.transaction({ transaction }, x=>func(t));