mongoose find

findOneAndUpdate

updateOne

ex)

const inviteUser = 
	await Room.findOneAndUpdate({ roomId: roomId },{ $push: { attendName: addUser.nickname }});

await Room.updateOne({ roomId: roomId },{ $push: { attendName: addUser.nickname }});

변수명을 불러올때 안올때 사용
const inviteUser 를 불러오지않아도
동작함.

둘다 됨.