Question

How to pull inner array having key address1

"_id": 2,
"info": {
    "address1": {
        "city": {
            "0": "Indore"
        },
        "state": {
            "0": "MP"
        }
    },
    "address2": {
        "city": {
            "0": "Mhow"
        },
        "state": {
            "0": "MP"
        }
    }
}

After removing data should be :

"_id": 2,
"info": {
    "address1": {
        "city": {
            "0": "Indore"
        },
        "state": {
            "0": "MP"
        }
    }
}

I used this db.info.update({"_id":2},{'$pull':{"info":{"address1":{'$exists':true}}}})
But It gives error Cannot apply $pull/$pullAll modifier to non-array

Answer 1

From the mongo console:

> db.tester.find()
{ "_id" : 2, "info" : { "address1" : { "city" : { "0" : "Indore" }, "state" : { "0" : "MP" } }, "address2" : { "city" : { "0" : "Mhow" }, "state" : { "0" : "MP" } } } }
> db.tester.findAndModify({query: {"_id":2}, update : {$unset: {"info.address2":1}}, new:true})
{
    "_id" : 2,
    "info" : {
        "address1" : {
            "city" : {
                "0" : "Indore"
            },
            "state" : {
                "0" : "MP"
            }
        }
    }
}
> db.tester.find()
{ "_id" : 2, "info" : { "address1" : { "city" : { "0" : "Indore" }, "state" : { "0" : "MP" } } } }

Does this accomplish what you need?