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Delete a collection

Problem

You need to delete a collection, including all of its documents, from the current database.

Solution

Use the Delete function:

client.query(
  q.Delete(q.Collection('dilapidated_huts'))
)
.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 = client.query(
  q.delete(q.collection("dilapidated_huts"))
)
print(result)

{'ref': Ref(id=dilapidated_huts, collection=Ref(id=collections)), 'ts': 1635183090850000, 'history_days': 30, 'name': 'dilapidated_huts', 'data': {'env': 'test'}}

result, err := client.Query(
	f.Delete(f.Collection("dilapidated_huts")))

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 0xc0001844b0 0xc0001844b0 <nil>} ts:1635183036860000]

try
{
    Value result = await client.Query(
        Delete(Collection("dilapidated_huts"))
    );
    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(
    client.query(
        Delete(Collection("dilapidated_huts"))
    ).get());

{ref: ref(id = "dilapidated_huts", collection = ref(id = "collections")), ts: 1635183075770000, history_days: 30, name: "dilapidated_huts", data: {env: "test"}}

Delete(Collection('dilapidated_huts'))

{
  ref: Collection("dilapidated_huts"),
  ts: 1635183253930000,
  history_days: 30,
  name: 'dilapidated_huts',
  data: { env: 'test' }
}

Query metrics:

bytesIn: 44
bytesOut: 186
computeOps: 1
readOps: 0
writeOps: 1
readBytes: 255
writeBytes: 385
queryTime: 46ms
retries: 0

Discussion

When a collection is deleted:

All of the documents contained in the collection are also deleted.
Any indexes with a single source matching the collection are also deleted.
Any indexes that have multiple source collections are not deleted.
References to the collection, or to documents within the collection, that are stored in any documents outside of the collection, are not modified and are no longer valid.

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