Markdown nodes null in production about gatsby-source-graphcms HOT 8 OPEN

@zzullick we moved to another CMS. We're one of the case studies on the website too 💔.

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Hey everyone,

I have the same issue with buildMarkdownNodes working in development but not in production mode.
Are there any logs that we can provide to assist in debugging?

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@notrab anything we can do to help on this one? We are stuck in a holding pattern on a few projects.

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So i managed to work around the issue in my case, which is very similar to the case that you posted as an example @sbuys.
Here is a quick rundown of what i changed:

Previously, i was simply querying the ids of all posts/pages that contained the markdownNodes in gatsby-node.js, passed them to the gatsby template pages via the context and then retrieved all required fields within the template via page queries.

I found that when i query all required fields within gatsby-node and then pass all of them via the context, the markdownNodes are not null anymore.

I am guessing that this might be either due to some sort of race-condition (might explain why it works during development as the fields are queried on demand) or an issue where certain nodes are simply not available during page queries.

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Another piece of information:

I noticed that the workaround i posted above suddenly stopped working.
To get it working again, i needed to clean the cache and rebuild.

So it might also be a caching issue?

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@DennisSimon thanks for the update. I'll look into the caching and report back.

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@DennisSimon The problem actually seems tied to the code in onCreateNode().

Per the documentation for Gatsby v4, mutation of nodes outside of createNode() is an anti-pattern. More info here.

field.value.markdownNode = markdownNode.id will not update the node in the Gatsby store and the fact that it works in development is probably a fluke.

What I'm not sure about is how to use the recommended API createNodeField as it seems you can't alter a field directly.

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Any updates or workaround on this issue? Experiencing the same thing with 2.8.0 and gatsby 4.20.0.

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