Max tag length is set to 50, in Kolibri it is 30

[rtibbles]

Observed behavior

The max length for tags in Studio is 50, but it is 30 in Kolibri.

Expected behavior

We should not publish channels that will break Kolibri when importing.

At the very least, we should exclude or truncate longer tags at import.

We should also update the frontend and API validation to max at 30 to prevent any new tags.

We will then need to come up with a migration plan for existing tags that are too long.

User-facing consequences

Impossible to import channels into strict database engines (i.e. postgresql).

[vkWeb]

I think I can look into this...?

[rtibbles]

That would be great, @vkWeb - the publishing code is in here: https://github.com/learningequality/studio/blob/unstable/contentcuration/contentcuration/utils/publish.py so the most important thing is to just not include tags greater than 30 characters when we publish as a first step.

We can then do further things to help rectify this issue!

[vkWeb]

studio/contentcuration/kolibri_content/models.py

Line 62 in bedd893

tag_name = models.CharField(max_length=30, blank=True)

@rtibbles max_length is restricted to 30 on the ContentTag model 🤔...?

[rtibbles]

That is the export model - but it's also SQLite, so it doesn't get enforced at the database level, so can still be written.

The tag class for Studio specifies a max length of 50:
https://github.com/learningequality/studio/blob/unstable/contentcuration/contentcuration/models.py#L1019