Support display of related posts using className related on the core/…

…post-template block #36

includes/post-template.php

@@ -16,14 +16,26 @@ function thisis_render_block_core_post_template( $attributes, $content, $block )
 }
 
 /**
- * Fiddles the query to support orderby=rand when the className is "rand".
+ * Fiddles the query depending on the value of the Additional Class(es) field.
  *
+ * Fiddles the query to support orderby=rand when the className is "rand".
+ * Fiddles the query to support display of posts in the related category/categories when the className is "related"
  */
 function thisis_post_template_fiddle( $attributes, $content, $block ) {
+
 	$className = isset( $attributes['className'])  ? $attributes['className'] : null;
 	if ( $className && 'rand' === $className ) {
 		$block->context['query']['orderBy'] = $className;
 	}
+
+	if ( $className && 'related' === $className ) {
+		bw_trace2();
+		$post = get_post();
+		bw_trace2( $post );
+		$terms = wp_get_post_categories( $post->ID, [ 'fields' => 'ids']);
+		bw_trace2( $terms, "terms", false );
+		$block->context['query']['taxQuery']['category'] = $terms;
+	}
 	//bw_trace2();
 	return $block;
 }