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Editorial Team
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Asked: 2026-06-02T22:30:30+00:00

How to search value in multidimensional array, for example I want to search example

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How to search value in multidimensional array,
for example I want to search example keyword in the following data in mongodb
I used to fetch all data from command

>db.info.find()

{
    "_id" : ObjectId("4f74737cc3a51043d26f4b90"),
    "id" : "12345",
    "info" : [
            {
                    "sno" : 1,
                    "name" : "ABC",
                    "email" : "abc@example.com"
            },
            {
                    "sno" : 2,
                    "name" : "XYZ",
                    "email" : "xyz@example.com"
            },
            {
                    "sno" : 3,
                    "name" : "XYZ",
                    "email" : "xyz@demo.com"
            },
            {
                    "sno" : 4,
                    "name" : "ABC",
                    "email" : "abc@demo.com"
            },
            {
                    "sno" : 5,
                    "name" : "Rohan",
                    "email" : "rohan@example.com"
            }
    ]
}

Now, to find data having example I used command

>db.info.find({"info.email":"example"})
and it gives

{
    "_id" : ObjectId("4f74737cc3a51043d26f4b90"),
    "id" : "12345",
    "info" : [
            {
                    "sno" : 1,
                    "name" : "ABC",
                    "email" : "abc@example.com"
            },
            {
                    "sno" : 2,
                    "name" : "XYZ",
                    "email" : "xyz@example.com"
            },
            {
                    "sno" : 3,
                    "name" : "XYZ",
                    "email" : "xyz@demo.com"
            },
            {
                    "sno" : 4,
                    "name" : "ABC",
                    "email" : "abc@demo.com"
            },
            {
                    "sno" : 5,
                    "name" : "Rohan",
                    "email" : "rohan@example.com"
            }
    ]
}

But I want only 3 out of 5 sub rows like

{
    "_id" : ObjectId("4f74737cc3a51043d26f4b90"),
    "id" : "12345",
    "info" : [
            {
                    "sno" : 1,
                    "name" : "ABC",
                    "email" : "abc@example.com"
            },
            {
                    "sno" : 2,
                    "name" : "XYZ",
                    "email" : "xyz@example.com"
            },
            {
                    "sno" : 5,
                    "name" : "Rohan",
                    "email" : "rohan@example.com"
            }
    ]
}
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1 Answer

  1. Editorial Team

    I tried Map Reduce Function and it works on this type of problems the code is something like that:

    Write a map function

      map=function () 
  {
      filter = [];
      this.info.forEach(function (s) {if (/example/.test(s.email)) {filter.push(s);}});
      emit(this._id, {info:filter});
  }

    Write a reduce function

      reduce=function(key, values) { return values;}

    MapReduce Function

      res=db.info.mapReduce(map,reduce,{out:{inline:1}})

    And The Output look likes:

    "results" : [
    {
            "_id" : ObjectId("4f9a2de0ea4a65c3ab85a9d3"),
            "value" : {
                    "info" : [
                            {
                                    "sno" : 1,
                                    "name" : "ABC",
                                    "email" : "abc@example.com"
                            },
                            {
                                    "sno" : 2,
                                    "name" : "XYZ",
                                    "email" : "xyz@example.com"
                            },
                            {
                                    "sno" : 5,
                                    "name" : "Rohan",
                                    "email" : "rohan@example.com"
                            }
                    ]
            }
    }
    ],
    "timeMillis" : 1,
    "counts" : {
            "input" : 3,
            "emit" : 3,
            "reduce" : 0,
            "output" : 3
    },
    "ok" : 1,

    Now you can find your search data from 

       printjson(res.results)
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