Bhavesh

Bhavesh

Hi :wave:

I am trying to get the data paginated, and I am trying all the methods and actions but still stuck while doing that. here is the methods I tried


   read :list do
      pagination do
        keyset? true
        offset? true
        countable true
        default_limit 10
      end
    end
 read :list do
      pagination do
        offset? true
        countable true
        default_limit 10
      end

      filter expr(true)
    end

I found all the result variables like count,more, before, after but while reading the documentation i found that the methods gives counts expect i got “nil” and for list i am doing this,

  1. List item
 allcontect =
      People
      |> Ash.Query.for_read(:list)
      |> Ash.read!()
  1. List item with count and pagination
 page = 1
    limit = 10
    offset = (page - 1) * limit

    allcontect =
      People
      |> Ash.Query.for_read(:list)
      |> Ash.Query.limit(limit)
      |> Ash.Query.offset(offset)
      |> Ash.read!()

It give me only first 10 records but I am not able to fetch others while handling next_page and previous_page events.

Showing Posts 1 to 7

zachdaniel

zachdaniel

Creator of Ash

Take a look at the pagination guide: Pagination — ash v3.29.3

Pagination is done via Ash.Query.page or via the page option to Ash.read, i.e

query
|> Ash.Query.page(limit: 10, offset: 20, count?: true)

or

Ash.read!(page: [limit: 10, offset: 20, count?: true])
Bhavesh

Bhavesh OP

Thanks, it’s very help-full for me i used this,

Ash.read!(page: [limit: 10, offset: 20, count?: true])

this is working actually and i tested for thousands of data but i am wondering it can help me to handle millions of data or not?

olivermt

olivermt

As long as your offset or keyset page id is indexed that is fine (and PKs generally are).

Bhavesh

Bhavesh OP

Thanks! That makes sense.

zachdaniel

zachdaniel

Creator of Ash

Look into keyset pagination. It will perform well on practically any amount of data with properly indexed data

dimitarvp

dimitarvp

Link (v3.5.6 as of 2025-APR-18): Ash Keyset Pagination

btw, is this relating to cursor pagination? :thinking: I can’t find it mentioned anywhere.

Or, since we are here on this topic, is keyset pagination the same as e.g. “give me 20 records where ID is greater than 157”?

zachdaniel

zachdaniel

Creator of Ash

Yes. I should add “also known as cursor pagination” somewhere on that page to make it easier to find.

edit: done

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