我尝试做的是获取一个数组内部的对象值，模型如下：

_id:630e2a2250283de03b2dc920
fullName: John
phone:"+1234..."
createdAt:2022-08-30T15:17:54.608+00:00
selectedClients:Array
   0:Object
     phone:"+4567..."
     fullName:"Client1"
     _id:630e2a8f8367a2aaac3343b4
     createdAt:2022-08-30T15:19:43.372+00:00
   1:Object
     phone:"+7890..."
     fullName:"Client2"
     _id:630e2b73d42ddc8d622e860f
     createdAt:2022-08-30T15:23:31.883+00:00
__v:0

因此，我想要查找的是Client1。我获得了用户ID和客户端ID。我尝试了一种方法，但它返回了整个用户模型，而不仅仅是Client1对象。

exports.removeTrustee = asyncHandler(async (req, res, next) => {
  const user_id = req.params.user_id.split("-")[1];
  const client_id = ObjectId(req.params.client_id.split("-")[1]);

  const client = await User.find({
     selectedClients: { $elemMatch: { _id: client_id } },
  });

因此，基本上我想要的是只返回我作为参数放置的client_id对象。
示例：

phone:"+4567..."
fullName:"Client1"
_id:630e2a8f8367a2aaac3343b4
createdAt:2022-08-30T15:19:43.372+00:00

我该怎么做呢？