Module lesson order updates not persisted with object cache

[yscik]

Steps to Reproduce

• Set up an object cache plugin / Jetpack / Atomic
• Create a course with modules and lessons in a module
• Reorder the lessons inside a module, either in the course outline block, or the Lesson order admin page

What I Expected

• The changed order to persist

What Happened Instead

• The original order is restored after saving
• After refresh the page a few seconds later, the changed order is now applied

PHP / WordPress / Sensei LMS version

• Sensei LMS 3.6.1

Screenshot / Video

Screen.Recording.2021-01-14.at.14.16.21.mov

[yscik]

The root of the problem is that this meta is stored on the lesson posts (_order_module_XXX). Top-level lesson and module order, which is stored on the course post that's being updated, is not affected.

[donnapep]

Was able to reproduce this on a Pressable site. Noting here that refreshing the page after reordering only shows the updated order when using the course outline block, but not when reordering and refreshing the Order Lessons page.

Setting as high priority because I've seen some complaints of this myself, and because reordering doesn't work at all on the Order Lessons page.

[cagrimmett]

Ran into this as well:

• Reordered the lessons
• Saved
• Page refresh
• Not honoring saved reordering
• Flushed object cache through Pressable control panel
• Refreshed lesson order page
• Showed the correct ordering we saved originally