PicklingError for SampleStreamBlockMeta

[vladox]

We are getting the following error, is it a known issue?

_pickle.PicklingError: Can't pickle <class 'wagtail.core.blocks.base.SampleStreamBlockMeta'>: attribute lookup SampleStreamBlockMeta on wagtail.core.blocks.base failed

[vladox]

How do you avoid caching in the Wagtail API? The issue is with an APIView, but I couldn't find a way for the middleware to ignore the API Calls.

[vsalvino]

Good question. For the pickling error, what version of Wagtail and Django are you using?

As far as not caching the API, you'll need to disable the middleware, and either:

• warp the specific URL routes in the cache_page decorator.
• Or decorate the specific page models you want cached.

See this section in the docs: https://docs.coderedcorp.com/wagtail-cache/getting_started/install.html#only-cache-specific-views

Let me know if either of those approaches helps.

Hint while debugging: the HTTP Response contains an X-Wagtail-Cache header which indicates: skip, miss, or hit. If it is not present in the response then the URL is not even being touched by wagtail-cache.