How to filter record from multilevel document as per user input using MongoDB and Node.js?

Question

I need to fetch the data from multilevel document from MongoDB using aggregate function as per user input but not getting the result as expected. I am providing the format of document below.

{
    "zone_list":[{
        "zone":'NORTH',
        "state_list":[{
            "state":"DELHI",
            "location_list":[{
                "location":"NEW DELHI",
                "task_list":[{
                    "login_id":"9937229853"
                },{
                   "login_id":"9937229854" 
                }]
            },{
                "location":"AIRPORT",
                "task_list":[{
                    "login_id":"9937229855"
                }]
            }]
        },{
           "state":"JK",
            "location_list":[{
                "location":"NEW JK",
                "task_list":[{
                    "login_id":"9937229856"
                },{
                   "login_id":"9937229857" 
                }]
            },{
                "location":"AIRPORT JK",
                "task_list":[{
                    "login_id":"9937229858"
                }]
            }] 
        }]
    },{
        "zone":'EAST',
        "state_list":[{
            "state":"WB",
            "location_list":[{
                "location":"KOLKATA",
                "task_list":[{
                    "login_id":"9937229859"
                },{
                   "login_id":"9937229850" 
                }]
            },{
                "location":"ASAM",
                "task_list":[{
                    "login_id":"9937229895"
                }]
            }]
        },{
           "state":"ODISHA",
            "location_list":[{
                "location":"BHUBANESWAR",
                "task_list":[{
                    "login_id":"9937229844"
                },{
                   "login_id":"9937229845" 
                }]
            },{
                "location":"AIRPORT BBSR",
                "task_list":[{
                    "login_id":"9937229846"
                }]
            }] 
        }]
    }]
}

The above is my inserted docs in database. Here I need to filter the data by matching the zone,state and location. Let's say user has input zone='NORTH' and state='DELHI' and location='AIRPORT' so accordingly the corresponding record should fetched. I am using the below query but did not find the expected output.

db.collection.aggregate([
    {$match:{}},
    {$unwind:"$zone_list"},
    {$unwind:"$state_list"},
    {$match:{zone:zoneInput,state:stateInput}}])
    .toArray((err,docs)=>{
        if (!err) {
            res.send(docs);
        }
})

Here I am getting the blank output. I need if user is giving the zone,state and location as input the respective result will be retrieved.

Answer 1

Looks like state_list is nested inside zone_list so second $unwind is the problem here, try:

db.collection.aggregate([
    {
        $unwind: "$zone_list"
    },
    {
        $unwind: "$zone_list.state_list"
    },
    {
        $match: {
            "zone_list.zone": "NORTH",
            "zone_list.state_list.state": "DELHI",
            "zone_list.state_list.location_list.location": "AIRPORT"            
        }
    }
])