Real-time collaboration: Add support for syncing post meta#72332
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Flaky tests detected in 36afbb3. 🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/18505483594
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pkevan
reviewed
Oct 21, 2025
| const shouldSync = Boolean( | ||
| applyFilters( | ||
| 'sync.shouldSyncMeta', | ||
| ! metaKey.startsWith( '_' ), |
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should we also consider meta which can be multiple? i.e. when single is false as per: https://developer.wordpress.org/reference/functions/register_meta/. Unsure how often this is used but given it's a default, it's probably worth considering, particularly if we are syncing the value.
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This will work as-is since the values are merged using our existing (recursive) mergeValues. Added a test for this in 6ec79a0
youknowriad
reviewed
Oct 23, 2025
| */ | ||
| const shouldSync = Boolean( | ||
| applyFilters( | ||
| 'sync.shouldSyncMeta', |
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Why do we need a filter, why can't we just sync everything? Also, why aren't we syncing private meta (that starts with _). I'm wondering if the security should be at another level, in other words, if a user is able to start a collaborative session for a given "document"/"post" than that user probably already has the right permissions to see the full object.
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Why do we need a filter, why can't we just sync everything?
It was initially committed because we implemented CRDT persistence in our plugin and needed a way to exempt it from syncing. If CRDT persistence is merged upstream it can be a single hardcoded exception in the Gutenberg codebase.
Since post meta intersects significantly with plugins, we did wonder if there might be very large post meta values or quirky implementations that need an opt-out filter. I'll remove it until specific examples materialize.
Also, why aren't we syncing private meta (that starts with _).
This is due to an overabundance of caution and an incomplete understanding of "hidden" post meta. The docs seem to indicate that they are used with "classic" meta boxes which might not be compatible with syncing anyway. Again, I'll remove it pending a stronger reason.
if a user is able to start a collaborative session for a given "document"/"post" than that user probably already has the right permissions to see the full object.
Agreed, thanks.
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youknowriad
reviewed
Oct 24, 2025
| // should be synced. | ||
| Object.entries( newValue ?? {} ).forEach( | ||
| ( [ metaKey, metaValue ] ) => { | ||
| if ( disallowedPostMetaKeys.has( metaKey ) ) { |
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This is an empty array, we can remove it as well.
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When I merge #72373, I will need to add the CRDT post meta to the set.
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chriszarate
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Oct 27, 2025
* Add support for syncing post meta * Sync all meta by default * Add test for non-single meta * Add CRDT persistence meta key to disallowed set
chriszarate
added a commit
that referenced
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Oct 27, 2025
* Add support for syncing post meta * Sync all meta by default * Add test for non-single meta * Add CRDT persistence meta key to disallowed set
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What?
Add support for syncing post
metafields in addition to core fields liketitle,blocks, etc.Why?
Post meta fields are central to the editing experience.
How?
In order to be synced, post meta must be registered with the
show_in_restargument set totrue. Otherwise, it is not available to thecore-datastore.Automatically syncing all post meta is probably not desirable behavior. As a default stance, we exclude "hidden" post meta fields (whose meta key begins with an underscore). This gives plugins a code-free path to opting out. We provide a filter that allows plugins to override that default stance.
Testing Instructions
Testing Instructions for Keyboard
No UI changes in this PR.
Screenshots or screencast
post-meta.mov