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mongodb unwind

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North Bear answered on July 23, 2020 Popularity 10/10 Helpfulness 4/10

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mongodb unwind

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{
  $unwind:
    {
      path: <field path>,
      includeArrayIndex: <string>,
      // to include documents whose sizes field is null, missing, or an empty array.
      preserveNullAndEmptyArrays: <boolean>
    }
}

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Source: docs.mongodb.com

Tags: javascript mongodb unwind

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Contributed on Jul 23 2020

North Bear

0 Answers Avg Quality 2/10

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unwind mongodb

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unwind:
 It is used for array attribute to show seprate result for that array.

// Inserted data : 
db.inventory.insertOne({ "_id" : 1, "item" : "ABC1", 
sizes: [ "S", "M", "L"] })

// unwind query 
db.inventory.aggregate( [ { $unwind : "$sizes" } ] )

// output
{ "_id" : 1, "item" : "ABC1", "sizes" : "S" }
{ "_id" : 1, "item" : "ABC1", "sizes" : "M" }
{ "_id" : 1, "item" : "ABC1", "sizes" : "L" }

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Source: Grepper

Tags: javascript j

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Contributed on Apr 16 2022

Abhishek

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Unwind Mongodb

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db.vehicledetails.aggregate([{$unwind : {path: "$model_year", preserveNullAndEmptyArrays: true}}]).pretty()

Popularity 10/10 Helpfulness 2/10 Language whatever

Source: www.bmc.com

Tags: mongodb

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Contributed on Aug 25 2021

Important Ibis

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