首先这是我的Workspaces系列

[
    {
        "WorkspaceId": "er890we8rw98ro9we8rjower",
        "WorkspaceTitle": "My First Workspace",
        "WorkspaceOwner": "user1",
        "Pages": [
            {
                "PageId": "a1sd32as7d841a23sd",
                "PageMembers": [
                    {
                        "MemberId": "user1",
                        "MemberName": "John",
                        "MemberAvatar": "https://example.com/jKLa29Wqy",
                        "MemberAccess": "can edit"
                    },
                    {
                        "MemberId": "user2",
                        "MemberName": "Margot",
                        "MemberAvatar": "https://example.com/wKKLSAqy",
                        "MemberAccess": "can edit"
                    },
                    {
                        "MemberId": "user3",
                        "MemberName": "Silvia",
                        "MemberAvatar": "https://example.com/wKKLSAqy",
                        "MemberAccess": "can edit"
                    },
                    ...
                ]
            }
        ]
    }
]

我想从文档中打印特定的嵌套对象。我需要像这样在我的集合中获得一个特定的文档。

{
  "WorkspaceId": "er890we8rw98ro9we8rjower",
  "WorkspaceTitle": "My First Workspace",
  "WorkspaceOwner": "user1",
  "Pages": [
    {
      "PageId": "a1sd32as7d841a23sd",
      "PageMembers": [
        {
          "MemberId": "user1",
          "MemberName": "John",
          "MemberAvatar": "https://example.com/jKLa29Wqy",
          "MemberAccess": "can edit"
        }
      ]
    }
  ]
}

但是当我运行这个脚本的时候，我的api会打印出所有的集合，我该怎么做呢？
下面是我使用的查询：

db.findOne({ $or: [{ "WorkspaceOwner": member_id }, { "Pages.PageMembers.MemberId": member_id }] }, function (err, result) {
            res.status(200).json(result);
});