is there any way where i can apply group and pagination using createQuery? - rethinkdb

Question

Query like this,
http://localhost:3030/dflowzdata?$skip=0&$group=uuid&$limit=2
and dflowzdata service contains data like,
[
{
"uuid": 123456,
"id": 1
},
{
"uuid": 123456,
"id": 2
},
{
"uuid": 7890,
"id": 3
},
{
"uuid": 123456,
"id": 4
},
{
"uuid": 4567,
"id": 5
}
]
Before Find Hook like,
if (query.$group !== undefined) {
let value = hook.params.query.$group
delete hook.params.query.$group
const query = hook.service.createQuery(hook.params.query);
hook.params.rethinkdb = query.group(value)
}
Its gives correct result but without pagination, like I need only two records but its give me all records
result is,
{"total":[{"group":"123456","reduction":3},{"group":"7890","reduction":1},{"group":"4567","reduction":3}],"data":[{"group":"123456","reduction":[{"uuid":"123456","id":1},{"uuid":"123456","id":2},{"uuid":"123456","id":4}]},{"group":"7890","reduction":[{"uuid":"7890","id":3}]},{"group":"4567","reduction":[{"uuid":"4567","id":5}]}],"limit":2,"skip":0}
can anyone help me how should get correct records using $limit?

Answer 1

According to the documentation on data types, ReQL commands called on GROUPED_DATA operate on each group individually. For more details, read the group documentation. So limit won't apply to the result of group.
The page for group tells: to operate on all the groups rather than operating on each group [...], you can use ungroup to turn a grouped stream or grouped data into an array of objects representing the groups.
Hence ungroup to apply functions to group's result:
r.db('db').table('table')
.group('uuid')
.ungroup()
.limit(2)