Prevent duplicate posts across featured blocks

Prevents the same post or product from appearing twice on a page where multiple Latest Posts blocks or Hand Picked Products blocks can be used. In this example it applies just to the home page.

// Global Variable For Tracking Used Posts
$home_feature_posts = array();

// Load Posts From Each Query
add_filter( 'the_posts', function( $posts, $query ) {

	if( ! is_front_page() ) {
		return $posts;
	}

	global $home_feature_posts;

	foreach( $posts as $i => $post ) {
		$home_feature_posts[] = $post->ID;
	}

	return $posts;

}, 10, 2 );

// Exclude Posts From Previous Queries
add_action( 'parse_query', function( &$query ) {

	if( ! is_front_page() ) {
		return;
	}

	global $home_feature_posts;

	if( empty( $query->post__not_in ) ) {
		$query->set( 'post__not_in', $home_feature_posts );
	}

} );

Instructions for Prevent duplicate posts across featured blocks

  1. Log into a staging or locally hosted clone of your site.
  2. Install and activate Code Snippets plugin.
  3. WP Admin > Snippets > Add New
  4. Copy and paste the code from the section above.
  5. Check to ensure formatting came over properly.
  6. Customize the code as desired.
  7. Add a meaningful title.
  8. Select whether to run on front-end or back-end (or both).
  9. Click “Save and Activate”.
  10. Test your site to ensure it works.
  11. Disable if any problems, or recover.
  12. Repeat for live environment.

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License

All code snippets are licensed GPLv2 (or later) matching WordPress licensing.

Except when otherwise stated in writing the copyright holders and/or other parties provide the program as-is without warranty of any kind, either expressed or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose.

Disclaimer of warranty
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