FQL v4 will be decommissioned on June 30, 2025. Ensure that you complete your migration from FQL v4 to FQL v10 by that date.

Fauna accounts created after August 21, 2024 must use FQL v10. These accounts will not be able to run FQL v4 queries or access the v4 Dashboard.

For more details, see the v4 EOL announcement and migration guide. Contact support@fauna.com with any questions.

Collection metadata

Problem

You need to store additional metadata in a collection document.

Solution

Set the data field in a collection:

adminClient.query(
  q.Update(
    q.Collection('dilapidated_huts'),
    { data: { env: 'test' } }
  )
)
.then((ret) => console.log(ret))
.catch((err) => console.error(
  'Error: [%s] %s: %s',
  err.name,
  err.message,
  err.errors()[0].description,
))
{
  ref: Collection("dilapidated_huts"),
  ts: 1635183086600000,
  history_days: 30,
  name: 'dilapidated_huts',
  data: { env: 'test' }
}
result = adminClient.query(
  q.update(
    q.collection("dilapidated_huts"),
    {"data": {"env": "test"}}
  )
)
print(result)
{'ref': Ref(id=dilapidated_huts, collection=Ref(id=collections)), 'ts': 1635183090850000, 'history_days': 30, 'name': 'dilapidated_huts', 'data': {'env': 'test'}}
result, err := adminClient.Query(
	f.Update(
		f.Collection("dilapidated_huts"),
		f.Obj{"data": f.Obj{"env": "test"}},
	))

if err != nil {
	fmt.Fprintln(os.Stderr, err)
} else {
	fmt.Println(result)
}
map[data:map[env:test] history_days:30 name:dilapidated_huts ref:{dilapidated_huts 0xc0001804b0 0xc0001804b0 <nil>} ts:1635183036860000]
try
{
    Value result = await client.Query(
        Update(
            Collection("dilapidated_huts"),
            Obj("data", Obj("env", "test"))
        )
    );
    Console.WriteLine(result);
}
catch (Exception e)
{
    Console.WriteLine($"ERROR: {e.Message}");
}
ObjectV(ref: RefV(id = "dilapidated_huts", collection = RefV(id = "collections")),ts: LongV(1635183024850000),history_days: LongV(30),name: StringV(dilapidated_huts),data: ObjectV(env: StringV(test)))
System.out.println(
        adminClient.query(
            Update(
                Collection(Value("dilapidated_huts")),
                Obj("data", Obj("env", Value("test")))
            )
        ).get());
{ref: ref(id = "dilapidated_huts", collection = ref(id = "collections")), ts: 1635183075770000, history_days: 30, name: "dilapidated_huts", data: {env: "test"}}
Update(
  Collection('dilapidated_huts'),
  { data: { env: 'test' } }
)
{
  ref: Collection("dilapidated_huts"),
  ts: 1635183253930000,
  history_days: 30,
  name: 'dilapidated_huts',
  data: { env: 'test' }
}
Query metrics:

  •    bytesIn:   99

  •   bytesOut:  186

  • computeOps:    1

  •    readOps:    0

  •   writeOps:    1

  •  readBytes:  227

  • writeBytes:  113

  •  queryTime: 18ms

  •    retries:    0

Discussion

Adding metadata to a collection can be used to store any information that helps to distinguish the collection from other collections.

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