Pagination not working as expected

[podarcis]

API Platform version(s) affected:

• api-platform/api-platform v4.1.0 (and main)
• @api-platform/admin v4.0.6

Description

With a fresh installation (following https://api-platform.com/docs/symfony/) that comes with a demo resource "Greeting", the pagination does not work as expected.

Having 6 items in the database and the pagination control with its pagesize-dropdown having 5 items-per-page, the listing incorrectly shows those full 6 items, and a click on page 2 results in two requests and still being on page 1.

Having 31 items in the database (while pagination control still showing 5 items-per-page), the listing shows 30 entries and a click on page 2 shows the 31th.

Page 1:

Page 2:

So it seems that the effective page-size is always 30 items, and the admin pagesize and pagination info is incorrect.

I found a similar issue #369 of 2021. However, I'm describing the behavior of an unmodified installation of API Platform with its demo resource already behaving incorrectly.

How to reproduce

• Install API Platform via template v4.1.0 (and/or use admin v4.0.6)
• Open admin interface in browser.
• Add 11 greeting entries -> Notice all 11 items to be shown, while pagesize says 10 items-per-page. Click page 2 and nothing happens.
• Add 31 greeting entries -> Notice 30 items to be shown and click on page 2 shows the 31th.

Possible Solution

Unknown

Additional Context

n/a

[podarcis]

I think I found the reason: Setting pagination page-size seems to be disabled by default and needs to be enabled according to https://api-platform.com/docs/core/pagination/#changing-the-number-of-items-per-page-client-side-globally-using-symfony first.

However, the Greeting example out-of-the-box is not working as expected (showing faulty pagination controls and not showing any error when trying to paginate with disabled page size). This IMO should be documented and/or changed in the defaults. Or if by default no client-side pagination is possible, the ListGuesser should know that hard-coded page-size (e.g.) 30 and pagination should reflect this.