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Core data: getEditedEntityRecord: do not return empty object #60988

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merged 7 commits into from
Apr 23, 2024

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ellatrix
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What?

There's a bug in getEditedEntityRecord: when neither its dependencies are defined, it's returning an empty object, which causes the editor to think there's an entity while there is not. This causes a bunch of code to the executed while there's no data, and wrong requests to be made (for example a template lookup for page because there's no slug yet, while later another is made for page-slug).

Why?

How?

Testing Instructions

Testing Instructions for Keyboard

Screenshots or screencast

@ellatrix ellatrix added the [Type] Performance Related to performance efforts label Apr 23, 2024
@ellatrix ellatrix requested a review from nerrad as a code owner April 23, 2024 09:29
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github-actions bot commented Apr 23, 2024

The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs. You can also manually ask me to refresh this list by adding the props-bot label.

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Co-authored-by: ellatrix <[email protected]>
Co-authored-by: Mamaduka <[email protected]>

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@ellatrix ellatrix added [Package] Core data /packages/core-data [Feature] Site Editor Related to the overarching Site Editor (formerly "full site editing") labels Apr 23, 2024
@@ -846,10 +846,18 @@ export const getEditedEntityRecord = createSelector(
kind: string,
name: string,
recordId: EntityRecordKey
): ET.Updatable< EntityRecord > | undefined => ( {
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It's interesting how the type and docs already accounted for undefined.

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github-actions bot commented Apr 23, 2024

Size Change: -954 B (0%)

Total Size: 1.74 MB

Filename Size Change
build/block-editor/index.min.js 256 kB +16 B (0%)
build/components/index.min.js 220 kB -133 B (0%)
build/core-data/index.min.js 72.5 kB +11 B (0%)
build/edit-post/index.min.js 16.9 kB -1.07 kB (-6%)
build/edit-site/index.min.js 224 kB -761 B (0%)
build/edit-site/style-rtl.css 13.9 kB +42 B (0%)
build/edit-site/style.css 14 kB +44 B (0%)
build/editor/index.min.js 78.8 kB +901 B (+1%)
ℹ️ View Unchanged
Filename Size
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compressed-size-action

} ),
): ET.Updatable< EntityRecord > | undefined => {
const raw = getRawEntityRecord( state, kind, name, recordId );
const edited = getEntityRecordEdits( state, kind, name, recordId );
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We could probably avoid the getEntityRecordEdits call if the raw entity is not defined yet?

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@ellatrix ellatrix requested a review from ajitbohra as a code owner April 23, 2024 12:23
@Mamaduka
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The proposal makes sense, but I'm afraid it will break any third-party consumer code that relied on previous behavior.

@ellatrix
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@Mamaduka The documentation says it can be undefined 🫠

@ellatrix
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Ok, @Mamaduka, I fixed it in 3087897. Let's return false instead so trying to read properties doesn't error.

@Mamaduka
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@ellatrix, true, but some of the updates in this PR highlight that sometimes people refer to returned values instead of the docs :(

A couple more examples from a GitHub search:

P.S. Sorry for popping up in your PRs like a "ghost of Gutenberg's past" 😅

@ellatrix
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@Mamaduka The new changes will fix that. const { meta_data: metadata } = false will not error. This way we can easily both return early for optimisation while also allowing reading properties without errors.

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Thank you, @ellatrix!

@ellatrix ellatrix enabled auto-merge (squash) April 23, 2024 13:37
@ellatrix ellatrix merged commit 4ec0363 into trunk Apr 23, 2024
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@ellatrix ellatrix deleted the fix/get-edited-entity-record branch April 23, 2024 13:39
@github-actions github-actions bot added this to the Gutenberg 18.3 milestone Apr 23, 2024
@jsnajdr
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jsnajdr commented Apr 25, 2024

I think that the backward compatibility concerns are much smaller than it looks.

First, the contract for getEditedEntityRecord was always that it can return undefined. All the other selectors in the same family (getEntityRecord, getEntityRecords, getRawEntityRecord, ...) also declare undefined as possible return value and in practice they also return it. We are not breaking backward compatibility, and the API user has no legitimate expectation for getEditedEntityRecord to not return undefined.

Sure, we don't want to be legalistic, we just want to be nice and not break people's code. But the two practical examples that @Mamaduka shared also don't pass closer scrutiny:

  • the useProductMetadata hook in Woo is very recent, and I haven't found any usage of it. It looks like @nathanss still has time to fix it before it's really used 🙂
  • in the MaxiBlocks plugin, unchecked getEditedEntityRecord is called when traversing through existing blocks, and when reading the wp_template_part entity in core/template-part. However, we are traversing through blocks that are already mounted, and when core/template-part mounts, it also calls getEditedEntityRecord for the same entity. Therefore, it's very unlikely that the entity wouldn't be already loaded when MaxiBlocks asks for it.

I propose that we simply return undefined from getEditedEntityRecord. The return values of the selectors are already messy enough, where some return undefined and some return null.

By the way, there is also the getEntityRecordNonTransientEdits selector that should return undefined when the entity doesn't exist, but it returns {} instead. Compare that to the getEntityRecordEdits selector which correctly returns undefined.

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I'd be ok with that, if we get some reports of breakage with the plugin, we could revert?

@@ -178,7 +178,7 @@ _Parameters_

_Returns_

- `undefined< EntityRecord > | undefined`: The entity record, merged with its edits.
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This undefined< EntityRecord > type exposes a bug in the docgen tool. The type in the source is ET.Updatable<EntityRecord>, and is imported with import type * as ET from './types';. Apparently the tool is unable to follow the wildcard references.

After I change the import to be non-wildcard (import { Updatable, ... } from './types') then docgen can process it correctly.

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Fixing this in #61097.

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@jsnajdr, there's always a private code that can't be found on GitHub or via wpdirectory.net.

Maybe we could share an early dev note to give people time to update the code if needed.

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jsnajdr commented Apr 25, 2024

I'd be ok with that, if we get some reports of breakage with the plugin, we could revert?

Yes, in this case I'd rather help plugins fix their code while the next WordPress/Gutenberg is still in alpha/beta.

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