[{teacher:{userId:1},students:[{"_id":"5e84d1a1ab3ebf54283b8cb2","userId":"5dd27452592f600900235945","profile_picture":"6e609f3b-44cb-44c0-888a-1b6767e3072d","name":"student zero"},{"_id":"5e84d1a1ab3ebf54283b8cb4","userId":"5dd27452592f600900235945","profile_picture":"6e609f3b-44cb-44c0-888a-1b6767e3072d","name":"student zero"}]}]

db.collection.find()