Connecting to MongoDB Successfully, But Having Issues with `getCollection()` - node.js

Question

I am writing some tests for a Node/Mongo project, and in one of my tests I need to connect to the database, and then pull a document from my jobs collection. However, I am running into an issue. I can connect to the database successfully, but then get an error on my findOne(). The specific error is:
TypeError: db.getCollection is not a function
Here is the code:
const MongoClient = require('mongodb').MongoClient;
const url = 'mongodb://localhost:27017';
const dbName = 'sample_db';
// Create a new MongoClient
const client = new MongoClient(url);
client.connect(async function (err) {
assert.equal(null, err);
console.log("Connected successfully to server"); // I see this in the console
const db = await client.db(dbName);
let savedJobResult = await db.getCollection("jobs").findOne({
"name": "Agenda Job Test"
});
console.log('savedJobResult: ', savedJobResult);
client.close();
});
What am I missing here?

Answer 1

Try this query
let savedJobResult = await db.collection("jobs").findOne({
"name": "Agenda Job Test"
});

Answer 2

change getCollection to collection
const insertDocuments = function(db, callback) {
// Get the documents collection
const collection = db.collection('documents');
// Insert some documents
collection.insertMany([
{a : 1}, {a : 2}, {a : 3}
], function(err, result) {
assert.equal(err, null);
assert.equal(3, result.result.n);
assert.equal(3, result.ops.length);
console.log("Inserted 3 documents into the collection");
callback(result);
});
}