Database.firstWhere()

Gets the first Database collection document that matches a provided predicate.

Signature

Database.firstWhere(pred: (DatabaseDef => Boolean)) => DatabaseDef | Null

Description

The Database.firstWhere() method gets the first Database collection document that matches a provided predicate.

If the predicate is true for a Database document, the document is included in the Set. Otherwise, the document is excluded.

Scope

The Database collection only contains documents for the direct child databases of the database scoped to your authentication secret. You can’t use the Database collection to access parent, peer, or other descendant databases.

Using FQL to create or manage top-level databases is not supported.

Parameters

Parameter Type Required Description

pred

Predicate function

Yes

Anonymous predicate function that:

The method returns the first Database document for which the predicate returns true.

Return value

One of:

Type Description

DatabaseDef

First Database document that matches the predicate.

Null

No Database document matches the predicate.

Examples

Database.firstWhere(.name.includes("child"))
{
  name: "childDB",
  coll: Database,
  ts: Time("2099-06-24T21:54:38.890Z"),
  typechecked: true,
  global_id: "ysjpykbahyyr1",
  priority: 10
}
Database.firstWhere(childDB => childDB.priority > 5)
{
  name: "childDB",
  coll: Database,
  ts: Time("2099-06-24T21:54:38.890Z"),
  global_id: "ysjpykbahyyr1",
  priority: 10,
  typechecked: true
}

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