Class (deprecated) - Fauna Docs

Description

This function is deprecated as of Fauna 2.7.0. Use Collection instead.

A Class was renamed to a Collection in Fauna 2.7.0. This function continues to exist for compatibility with older drivers.

The Class function returns a valid Reference for the specified class (now, collection) name, in the specified child database. If a child database is not specified, the returned class (now, collection) reference belongs to the current database.

When a child database is specified, an admin key must be used to call Class (server or client keys, or ABAC tokens, cannot be used to access a child database).

Also, Go does not support optional function parameters, nor function overloading. To specify a child database using the Go driver, call the ScopedClass function instead of Class.

Parameters

Parameter Type Definition and Requirements

Parameter	Type	Definition and Requirements
`name`	String	The name of a class (now, collection).
`database`	Reference	Optional - A Reference to a child database. If not specified, the current database is used. A Reference to a child database. Optional - A Reference to a child database. If not specified, the current database is used. Optional - A Reference to a child database. If not specified, the current database is used. Optional - A Reference to a child database. If not specified, the current database is used. Optional - A Reference to a child database. If not specified, the current database is used. Optional - A Reference to a child database. If not specified, the current database is used.

name

String

The name of a class (now, collection).

database

Reference

Optional - A Reference to a child database. If not specified, the current database is used.

A Reference to a child database.

Optional - A Reference to a child database. If not specified, the current database is used.

Returns

A Reference to a class (now, collection) with the specified name, in the specified child database (or the current database if database is not specified).

Examples

The following query gets a Reference to the class (now, collection) named "spells" within the current database:

client.query(
  q.Class('spells')
)
.then((ret) => console.log(ret))
.catch((err) => console.error(
  'Error: [%s] %s: %s',
  err.name,
  err.message,
  err.errors()[0].description,
))

Collection("spells")

result = client.query(
    q.class_("spells")
)
print(result)

Ref(id=spells, collection=Ref(id=collections))

result, err := client.Query(
	f.Class("spells"))

if err != nil {
	fmt.Fprintln(os.Stderr, err)
} else {
	fmt.Println(result)
}

{spells 0xc000090360 0xc000090360 <nil>}

try
{
    Value result = await client.Query(
        Class("spells")
    );
    Console.WriteLine(result);
}
catch (Exception e)
{
    Console.WriteLine($"ERROR: {e.Message}");
}

RefV(id = "spells", collection = RefV(id = "collections"))

System.out.println(
    client.query(
        Class("spells")
    ).get());

ref(id = "spells", collection = ref(id = "collections"))

Class('spells')

Collection("spells")

Query metrics:

bytesIn: 18
bytesOut: 80
computeOps: 1
readOps: 0
writeOps: 0
readBytes: 0
writeBytes: 0
queryTime: 4ms
retries: 0

The following query gets a Reference to the class (now, collection) named "spells" within a child database named "child_db":

client.query(
  q.Class('spells', q.Database('child_db'))
)
.then((ret) => console.log(ret))
.catch((err) => console.error(
  'Error: [%s] %s: %s',
  err.name,
  err.message,
  err.errors()[0].description,
))

Collection("spells", Database("child_db"))

result = client.query(
    q.class_("spells", q.database("child_db"))
)
print(result)

Ref(id=spells, collection=Ref(id=collections), database=Ref(id=child_db, collection=Ref(id=databases)))

result, err := client.Query(
	f.ScopedClass("spells", f.Database("child_db")))

if err != nil {
	fmt.Fprintln(os.Stderr, err)
} else {
	fmt.Println(result)
}

{spells 0xc0000902d0 0xc0000902d0 0xc000090330}

try
{
    Value result = await client.Query(
        Class("spells", Database("child_db"))
    );
    Console.WriteLine(result);
}
catch (Exception e)
{
    Console.WriteLine($"ERROR: {e.Message}");
}

RefV(id = "spells", collection = RefV(id = "collections"), database = RefV(id = "child_db", collection = RefV(id = "databases")))

System.out.println(
    client.query(
        Class("spells", Database("child_db"))
    ).get());

ref(id = "spells", collection = ref(id = "collections"), database = ref(id = "child_db", collection = ref(id = "databases")))

Class('spells', Database('child_db'))

Collection("spells", Database("child_db"))

Query metrics:

bytesIn: 50
bytesOut: 159
computeOps: 1
readOps: 0
writeOps: 0
readBytes: 155
writeBytes: 0
queryTime: 7ms
retries: 0