Ensure lesson resources load correctly across users and roles

[ozer550]

Summary

• Handle invalid lesson_id errors by stripping query params for learners not assigned to the lesson

References

closes #12061

Reviewer guidance

• Create a class with two learners.
• Assign one of the learner a lesson with resource like a pdf.
• Open the resource from the assigned learner and copy the url.
• Check if you can preview the same resource using the URL from a newly created user and from the other user assigned to class.

[github-actions]

Build Artifacts

Asset type	Download link
PEX file	kolibri-0.19.0a1.dev0_git.18.g6e2027d4.pex
Windows Installer (EXE)	kolibri-0.19.0a1.dev0+git.18.g6e2027d4-windows-setup-unsigned.exe
Debian Package	kolibri_0.19.0a1.dev0+git.18.g6e2027d4-0ubuntu1_all.deb
Mac Installer (DMG)	kolibri-0.19.0a1.dev0+git.18.g6e2027d4.dmg
Android Package (APK)	kolibri-0.19.0a1.dev0+git.18.g6e2027d4-0.1.5-debug.apk
Raspberry Pi Image	kolibri-pi-image-0.19.0a1.dev0+git.18.g6e2027d4.zip
TAR file	kolibri-0.19.0a1.dev0+git.18.g6e2027d4.tar.gz
WHL file	kolibri-0.19.0a1.dev0+git.18.g6e2027d4-py2.py3-none-any.whl

[rtibbles]

Did it not work to just call initSession() here again? If not, we can instead pass it as the second argument as an onComplete callback for the navigation: https://v3.router.vuejs.org/guide/essentials/navigation.html

So the line above would be:
this.$router.replace({ ...this.$route, query: null }, this.initSession);

[ozer550]

Surprisingly, this does not work even after I set query: null. Are there any downsides of current implementation?

[rtibbles]

Code checks out, just needs manual QA to confirm the fix here!

[pcenov]

Thanks @ozer550, I confirm that the issue reported in #12061 is fixed now.