Preview site not in MFE

[angonz]

As a course author, I would like to preview a course unit with the same MFE experience as for the live content.

Currently, the "Preview" button in Studio redirects to the legacy version of a course.
There's a thread open in the forum about this topic.

To replicate, go to Studio, edit a course, go to any unit, and hit "Preview".

[angonz]

@kdmccormick please check.

[kdmccormick]

I can confirm that this is an existing issue. I was on the team that migrated Open edX from its Legacy course UI to the Learning Micro-Frontend. We ran out of project time before we could migrate the Preview feature over to the Learning MFE, so it still uses the Legacy UI today.

The specific technical limitation is that the Learning MFE fetches course data from a set of read-optimized HTTP APIs. These APIs make the course load faster, but they currently only have access to "published" course content. The Preview feature relies on the ability to read "draft" (unpublished) course content, which only the legacy UI supports.

This needs to be resolved at some point so that we can remove the Legacy course UI, but it has not been planned or scheduled yet.

[KristinAoki]

Completed via
edx-plaform PR #35747
frontend-app-learning PR #1501
frontend-app-learning PR #1508

[kdmccormick]

Amazing, thank you @KristinAoki !

Before we close this out, I'm going to do some verification, particularly around data caches which are populated only when a unit is published. FYI @ormsbee .

[ormsbee]

@KristinAoki: This is fantastic! Thank you!

[kdmccormick]

This is currently causing an issue with jump_to URLs in Tutor Nightly: openedx/edx-platform#35747 (comment)