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I am trying to update multiple documents in multiple collections in a DB. While doing that Mongo throws an error after the first collection. And doesn't make changes on the after ones.

Error

Assertion failed: MongoError: Cannot use a session that has ended

const migration = async function migrate(client, dbName) {
    const engineDatabase = client.db(dbName);
    console.log(`connected to db ${engineDatabase.databaseName}`);

    const collections = await engineDatabase.collections();
    for (const collection of collections) {
        console.log(collection.collectionName);
        collection.updateMany({}, {$set: {"ownerIds": ["-1", "1"]}}, function (err, res) {
            console.assert(err == null, err);

            console.log(res.result.nModified + " document(s) updated");
            }
        ) 
    }
};
module.exports = migration;

Do I have to close the client after every update? Or do I have to wait for the next update? I couldn't get what's the point of this error.

kedar sedai
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Ahmet Yasin Türkyılmaz
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1 Answers1

1

This part is asynchronous

collection.updateMany({}, {$set: {"ownerIds": ["-1", "1"]}}, function (err, res) {
  console.assert(err == null, err);

  console.log(res.result.nModified + " document(s) updated");
})

Whats happening is your program is finishing while the updateMany is not yet done.

And you're already using async/await, you don't need to have a callback there.

You can instead do

const res = await collection.updateMany({}, {$set: {"ownerIds": ["-1", "1"]}});
console.log(res.result.nModified + " document(s) updated");
zishone
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