title: Aggregate Join in MongoDB not returning results
body: <p>I am trying to do an aggregate join to find patient information in the 'patients' table based on 'patient_id' field in the bookings table. Aggregate join is not returning results even though there are matching records in the 'patients' table. Am I doing something wrong? <a href="https://i.stack.imgur.com/Pyecd.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Pyecd.png" alt="enter image description here" /></a></p>