async.js – Tarik Billa

Node + Sequelize: How to check if item exists before adding? (async confusion)

December 16, 2023 by Tarik

Author.count isn’t really needed, unless you need the count. See findOrCreate(). With findOrCreate() you could have the following. (Edited trex005’s snippet for this) async.eachSeries(authors, function(item, callback) { Author.sync().then(function() { Author.findOrCreate({ where: { name: item.trim() }, defaults: { // set the default properties if it doesn’t exist name: item.trim() } }).then(function(result) { var author = result[0], … Read more

Iterating over a mongodb cursor serially (waiting for callbacks before moving to next document)

February 21, 2023 by Tarik

A more modern approach that uses async/await: const cursor = db.collection(“foo”).find({}); while(await cursor.hasNext()) { const doc = await cursor.next(); // process doc here } Notes: This may be even more simple to do when async iterators arrive. You’ll probably want to add try/catch for error checking. The containing function should be async or the code … Read more