在MongoDB中查找和更新4级数组

Question

我必须在MongoDB中找到4级数组中的更新，比如我的部门页面是一个有多个部门的数组，而我的所有部门都有多个部门，所有部门都有多个指定，所以我只能找到那些满足条件的指定数组，还必须使用推，拉和设置进行更新

示例结构

{
    "_id": "5649bb56db5648617ed36556",
    "departmentPage": {
        "departmentPageInfo": {
            "active": "1"
        },
        "departments": [
            {
                "_id": "56501d09cbb8a41d27c1c0e4",
                "active": 1,
                "divisions": [
                    {
                        "_id": "56501d69cbb8a49319c1c0e4",
                        "active": 1,
                        "departmentId": "56501d09cbb8a41d27c1c0e4",
                        "designations": [

                        ],
                        "instanceNo": 1,
                        "order": 1,
                        "title": "Php Development Recruitment"
                    },
                    {
                        "_id": "565078edcbb8a44546c1c0e4",
                        "active": 1,
                        "departmentId": "56501d09cbb8a41d27c1c0e4",
                        "designations": [
                            {
                                "_id": "56507944cbb8a44546c1c0e5",
                                "active": 1,
                                "departmentId": "56501d09cbb8a41d27c1c0e4",
                                "divisionId": "565078edcbb8a44546c1c0e4",
                                "instanceNo": 1,
                                "order": "1",
                                "title": "Senior php developer"
                            },
                            {
                                "_id": "5650795ccbb8a4b851c1c0e4",
                                "active": 1,
                                "departmentId": "56501d09cbb8a41d27c1c0e4",
                                "divisionId": "565078edcbb8a44546c1c0e4",
                                "instanceNo": 3,
                                "order": "1",
                                "title": "Junior php developer"
                            }
                        ],
                        "instanceNo": 2,
                        "order": "1",
                        "title": "Php Development "
                    }
                ],
                "instanceNo": 1,
                "order": 1,
                "title": "Information Technology (IT)"
            },
            {
                "_id": "56501d33cbb8a41f14c1c0e5",
                "active": 1,
                "divisions": [
                    {
                        "_id": "5652c228cbb8a4e152bfeb99",
                        "active": 1,
                        "departmentId": "56501d33cbb8a41f14c1c0e5",
                        "designations": [
                            {
                                "_id": "565305e7cbb8a4ef56bfeb9a",
                                "instanceNo": 1,
                                "departmentId": "56501d33cbb8a41f14c1c0e5",
                                "divisionId": "5652c228cbb8a4e152bfeb99",
                                "title": "Cashier",
                                "active": 1,
                                "order": "1"
                            },
                            {
                                "_id": "5653edaacbb8a4df74bfeb99",
                                "instanceNo": 2,
                                "departmentId": "56501d33cbb8a41f14c1c0e5",
                                "divisionId": "5652c228cbb8a4e152bfeb99",
                                "title": "Cash Collection Agent",
                                "active": 1
                            }
                        ]
                    }
                ]
            }
]
}
}

这是我试过的：

db.department.aggregate([
  {$unwind : '$departmentPage.departments.divisions.designations'}, 
  {$match :     
     {'departmentPage.departments.divisions.designations._id':ObjectId("")} 
  }
]) 

它得到0结果，它工作到部门，但之后它给出0结果