Latest Posts Block: Include posts from child categories when parent is selected #69793
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Mamaduka
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[Type] Enhancement
Mamaduka
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Mamaduka
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I think it would be better to handle this at the REST API/WP_Query level, as suggested in this comment, instead of trying to enhance the categories list on the client side.
| let catIds = [ ...selectedCatIds ]; | ||
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| if ( allCategories && selectedCatIds.length > 0 ) { | ||
| const childrenMap = {}; | ||
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| allCategories.forEach( ( category ) => { | ||
| const parentId = category.parent; | ||
| if ( parentId ) { | ||
| if ( ! childrenMap[ parentId ] ) { | ||
| childrenMap[ parentId ] = []; | ||
| } | ||
| childrenMap[ parentId ].push( category.id ); | ||
| } | ||
| } ); | ||
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| const getAllDescendants = ( parentIds ) => { | ||
| let descendants = []; | ||
| parentIds.forEach( ( parentId ) => { | ||
| const children = childrenMap[ parentId ] || []; | ||
| descendants = [ ...descendants, ...children ]; | ||
| if ( children.length > 0 ) { | ||
| descendants = [ | ||
| ...descendants, | ||
| ...getAllDescendants( children ), | ||
| ]; | ||
| } | ||
| } ); | ||
| return descendants; | ||
| }; | ||
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| const childCatIds = getAllDescendants( selectedCatIds ); | ||
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| catIds = [ | ||
| ...new Set( [ ...selectedCatIds, ...childCatIds ] ), | ||
| ]; | ||
| } |
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It's not recommended to iterate over values inside the useSelect hook callback. For additional details, see: https://make.wordpress.org/core/2025/03/12/data-a-helpful-performance-warning-for-developers-in-the-useselect-hook./
2 participants
Closes #65332
What?
This PR updates the Latest Posts Block to display posts from both parent and child categories when filtering by a parent category.
Why?
Currently, when using the Latest Posts Block with a Category filter, posts assigned only to child categories are not displayed when filtering by their parent category. This is inconsistent with WordPress's default behavior on category archive pages, where parent category pages display posts from both the parent and all child categories.
This change makes the Latest Posts Block behavior match the expected WordPress category hierarchy behavior, providing a more intuitive experience for users.
Testing Instructions
Screenshots or screencast
Latest.Posts.Block.mov