Function.byName()

Learn: User-defined functions (UDFs)

Get a user-defined Function document by its name.

Signature

Function.byName(name: string) => FunctionDef | NullFunctionDef

Description

The Function.byName() method gets the Function object if it exists and is accessible.

Staged schema

If a database has staged schema, this method interacts with the database’s staged schema, not the active schema.

Parameters

Parameter Type Required Description

name

String

Yes

Name of the UDF document to get.

Return value

One of:

Type Description

FunctionDef

Function object. See Function.

NullFunctionDef

UDF document doesn’t exist or is inaccessible.

Examples

  1. Fetch a UDF when it exists and is accessible:

    Function.byName("validateOrderStatusTransition")
    {
  name: "validateOrderStatusTransition",
  coll: Function,
  ts: Time("2024-10-25T17:49:28.145Z"),
  body: <<-END
    (oldStatus, newStatus) => {
      if (oldStatus == "cart" && newStatus != "processing") {
        abort("Invalid status transition.")
      } else if (oldStatus == "processing" && newStatus != "shipped") {
        abort("Invalid status transition.")
      } else if (oldStatus == "shipped" && newStatus != "delivered") {
        abort("Invalid status transition.")
      }
    }
  END
}

  2. When the UDF document doesn’t exist or is inaccessible:

    Function.byName("doesnotexist")
    Function.byName("doesnotexist") /* not found */

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