Editor: Register emoji reactions comment meta for Notes

[adamsilverstein]

Summary

Register the _wp_note_reactions comment meta in wp_create_initial_comment_meta(), alongside the existing _wp_note_status meta. This meta stores emoji reaction data for the block editor's collaborative Notes feature.

Data Model

Each emoji key (e.g., "👍", "❤️") maps to an array of reaction objects:

{
  "👍": [
    { "userId": 1, "date": "2025-01-15T10:30:00" },
    { "userId": 2, "date": "2025-01-15T11:00:00" }
  ],
  "❤️": [
    { "userId": 1, "date": "2025-01-15T10:35:00" }
  ]
}

REST Schema

• Type: object
• Single: true
• Default: [] (empty array)
• additionalProperties: Each property is an array of objects with:
  • userId (integer) — The reacting user's ID
  • date (string|null, date-time format) — When the reaction was added

Auth

Uses the same edit_comment capability check as _wp_note_status.

Changes

• Updated wp_create_initial_comment_meta() in src/wp-includes/comment.php to register _wp_note_reactions meta.
• Updated docblock with @since 7.0.0 tag.
• Regenerated tests/qunit/fixtures/wp-api-generated.js.

References

• Gutenberg PR: ​#75148
• wordpress-develop PR: ​#10930

## Summary

Register the _wp_note_reactions comment meta in wp_create_initial_comment_meta(), alongside the existing _wp_note_status meta. This meta stores emoji reaction data for the block editor's collaborative Notes feature.

### Data Model

Each emoji key (e.g., "👍", "❤️") maps to an array of reaction objects:

{
  "👍": [
    { "userId": 1, "date": "2025-01-15T10:30:00" },
    { "userId": 2, "date": "2025-01-15T11:00:00" }
  ],
  "❤️": [
    { "userId": 1, "date": "2025-01-15T10:35:00" }
  ]
}

### REST Schema

• Type: object
• Single: true
• Default: [] (empty array)
• additionalProperties: Each property is an array of objects with:
  • userId (integer) — The reacting user's ID
  • date (string|null, date-time format) — When the reaction was added

### Auth

Uses the same edit_comment capability check as _wp_note_status.

## References

• Gutenberg PR: ​https://github.com/WordPress/gutenberg/pull/75148
• Trac ticket: (to be created)

---

[swissspidy]

Why store reactions like this and not as a separate comment type? Makes it more flexible and potentially useful for regular comments as well. See also ​https://wordpress.org/plugins/react/

I have updated this backport PR to apply the custom comment type approach for storage used in ​https://github.com/WordPress/gutenberg/pull/75549 which replaces the meta based approach in ​https://github.com/WordPress/gutenberg/issues/75144.

[audrasjb]

WP 7.0 pre-beta1 Triage:
Unfortunately this enhancement didn't make it before beta 1 code freeze. Thus, let's move it to milestone 7.1.