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$toUUID (aggregation)

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  • Definition
  • Syntax
  • Example

Definition

$toUUID

Converts a string value to a UUID. If the input value is not a string, $toUUID errors.

Syntax

{
   $toUUID: <expression>
}

The $toUUID expression is shorthand for the following $convert expression:

{
   $convert: {
      input: <expression>,
      to: {
         type: "binData",
         subtype: 4 // UUID
      },
      format: "uuid"
   }
}

Example

Create a products collection with the following document:

db.products.insertOne(
   {
      name: "laptop",
      price: 400,
      UUID: "0e3b9063-8abd-4eb3-9f9f-f4c59fd30a60"
   }
)

In the example document, the UUID field is a string. To convert the UUID field to a UUID value, run the following $toUUID operation:

db.products.aggregate( [
   {
      $project: {
         name: 1,
         price: 1,
         UUID: {
            $toUUID: "$UUID"
         }
      }
   }
] )

Output:

[
   {
      _id: ObjectId('669945ab610b080391a8e2f5'),
      name: 'laptop',
      price: 400,
      UUID: UUID('0e3b9063-8abd-4eb3-9f9f-f4c59fd30a60')
   }
]

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