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Fix error in site-editor when presets are null #30144

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@aristath aristath commented Mar 23, 2021

Description

In an FSE theme if some things are missing from theme.json, the site-editor crashes with an error TypeError: can't access property "forEach", preset is null. After fixing that there's a 2nd error for presets. This PR fixes these 2 so the site-editor can continue loading if the theme doesn't have everything under the sun.

To replicate the issue remove the gradients from TT1-blocks' theme.json.

How has this been tested?

Tested with an FSE theme that is missing gradients definitions in theme.json

Types of changes

Added a check to only run the loops if preset & presets are not null.

Checklist:

  • My code is tested.
  • My code follows the WordPress code style.
  • [-] My code follows the accessibility standards.
  • [-] I've tested my changes with keyboard and screen readers.
  • [-] My code has proper inline documentation.
  • [-] I've included developer documentation if appropriate.
  • [-] I've updated all React Native files affected by any refactorings/renamings in this PR.

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Size Change: +17 B (0%)

Total Size: 1.41 MB

Filename Size Change
build/edit-site/index.js 27.2 kB +17 B (0%)
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@aristath aristath requested a review from gziolo March 23, 2021 14:55
@gziolo gziolo requested a review from oandregal March 23, 2021 15:08
`--wp--preset--${ cssVarInfix }--${ value.slug }: ${ value[ valueKey ] }`
);
} );
if ( preset ) {
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@gziolo gziolo Mar 23, 2021

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That's interesting. It looks like get doesn't add enough safety because preset is defined but set to some falsy value.

@oandregal
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Can we check why the preset doesn't have an array value? I don't understand why that happens: if the theme doesn't provide a preset the algorithm uses the core's defaults https://github.com/WordPress/gutenberg/blob/trunk/lib/experimental-default-theme.json#L4 I wonder if there's a bigger issue, something we landed that have broken this.

@oandregal oandregal mentioned this pull request Mar 23, 2021
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@aristath
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@nosolosw it started happening today for themes that are missing gradients in theme.json, so it must have been a recent commit.
I agree we should find the root cause, but regardless of that, having an extra check is not a bad thing and can only make things a bit more stable... 😉

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oandregal commented Mar 23, 2021

I agree we should find the root cause, but regardless of that, having an extra check is not a bad thing and can only make things a bit more stable... wink

My point is that to avoid having those checks all over the codebase in every place that data is accessed, we centralize the sanitization logic in the constructor of WP_Theme_JSON, so the other methods know the data is safe to process and don't need to do this check again.

@aristath
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@nosolosw you are correct. With git bisect it looks like #29828 is the culprit 👀

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gziolo commented Mar 24, 2021

#30171 might fix it but we need better test coverage for theme.json to be able to iterate with more confidence.

@aristath
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I'll go ahead and close this one since #30171 fixes the issue correctly 👍

@aristath aristath closed this Mar 24, 2021
@aristath aristath deleted the fix/null-presets branch March 24, 2021 08:52
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3 participants