Description

When using a multi-site setup, Django CMS allows to switch the CMS page tree to other sites via the triple-dot menu. When doing this, the key cms_admin_site is set in the session. Changing the template of a page from a different site (that is open in a different tab) now gives a 404 error.

Steps to reproduce

Steps to reproduce the behavior:

1. Open a page on Site A and go into edit mode in tab 1.
2. Open the page tree and switch it to site B in tab 2.
3. Change the template on the page in tab 1.
4. See 404 error.

Expected behaviour

The template change should be saved.

Actual behaviour

A broken message modal pops up with your project's 404 page. It's confusing because the site enabled via cms_admin_site is not communicated when editing PageContent.

Additional information (CMS/Python/Django versions)

This happens in CM 5.0.1, Python 3.12, Django 5.2.

The reason is that PageContentAdmin.get_queryset automatically filters by cms_admin_site and the get_object call of the change_template view goes through get_queryset. It should probably not filter by site when directly accessing a PageContent object (site filters are likely only useful for list views in this context). This could be done by adding kwargs to get_object and get_queryset that enables/disables the site filter.

Alternatively, the session mechanism could be removed and the CMS page tree could be filtered explicitly via a site query parameter instead.

Do you want to help fix this issue?

• Yes, I want to help fix this issue and I will join the channel #pr-reviews on the Discord Server to confirm with the community that a PR is welcome.
• No, I only want to report the issue.