WDSBT-23 - modify query for related posts block, exclude current post from the related posts list

Author: khleomix

inc/functions/related-posts-query.php

@@ -0,0 +1,61 @@
+<?php
+/**
+ * Related Posts Query
+ *
+ * @package wdsbt
+ */
+
+namespace WebDevStudios\wdsbt;
+
+/**
+ * Modify the query variables for the related posts block to exclude the current post.
+ *
+ * @param array    $query_vars The array of query variables.
+ * @param WP_Block $block The current block instance being rendered.
+ * @return array Modified query variables with the current post excluded.
+ */
+function related_posts_query( $query_vars, $block ) {
+
+	// Get the current post ID and its categories.
+	$current_id = get_the_ID();
+	$category   = get_the_category();
+
+	// Initialize variables.
+	$cat_id = '';
+
+	// Check if categories are assigned to the post.
+	if ( ! empty( $category ) ) {
+		if ( class_exists( '\WPSEO_Primary_Term' ) ) {
+			// Show the post's 'Primary' category if this Yoast feature is available and one is set.
+			$primary_term    = new \WPSEO_Primary_Term( 'category', $current_id );
+			$primary_term_id = $primary_term->get_primary_term();
+			$term            = get_term( $primary_term_id );
+
+			if ( is_wp_error( $term ) || ! $term ) {
+				// Default to first category (not Yoast) if an error is returned.
+				$cat_id = $category[0]->term_id;
+			} else {
+				// Set variables for cat_display & cat_slug based on Primary Yoast Term.
+				$cat_id = $term->term_id;
+			}
+		} else {
+			// Default, display the first category in WP's list of assigned categories.
+			$cat_id = $category[0]->term_id;
+		}
+	}
+
+	// Check if the block has the class 'related-posts-query'.
+	if ( isset( $block->parsed_block['attrs']['className'] ) && 'related-posts-query' === $block->parsed_block['attrs']['className'] ) {
+		$query_vars['post_type']      = 'post';
+		$query_vars['cat']            = $cat_id;
+		$query_vars['posts_per_page'] = 3;
+		$query_vars['post__not_in']   = array( get_the_ID() );
+		$query_vars['orderBy']        = 'date';
+		$query_vars['order']          = 'desc';
+		$query_vars['nopaging']       = 'true';
+	}
+
+	// Return the modified query variables.
+	return $query_vars;
+}
+add_filter( 'query_loop_block_query_vars', __NAMESPACE__ . '\related_posts_query', 10, 2 );