@unique

Specifies the name of a Fauna index that enforces a uniqueness constraint.

Location

Fields.

Arguments

Argument Type Required Description

index

String

no

The name for the unique index to use.

Description

The @unique directive marks a field as being unique. Unique fields have an associated unique index within the database. The index argument controls the name of the unique index. By default, the index name uses this template: unique_<type name>_<field name>.

Example

When the following GraphQL schema has been imported:

type User {
  name: String! @unique(index: "unique_username")
}

The database contains the following index:

Get(Index("unique_username"))
{ ref: Index("unique_username"),
  ts: 1560525943310000,
  active: true,
  partitions: 1,
  name: 'unique_username',
  source: Collection("User"),
  data: { gql: { ts: Time("2019-06-14T15:25:43.226352Z") } },
  terms: [ { field: [ 'data', 'name' ] } ],
  unique: true }

Is this article helpful? 

Tell Fauna how the article can be improved:
 Visit Fauna's forums or email docs@fauna.com

Thank you for your feedback!