Editor: Fix parents argument validation for Query block.

Allow passing zero (`0`) via the `parents` argument. It is a valid value for hierarchical post types, often used to display top-level items.

Props mamaduka, audrasjb, peterwilsoncc.
Fixes #62901.

git-svn-id: https://develop.svn.wordpress.org/trunk@59761 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/blocks.php

@@ -2638,7 +2638,7 @@ function build_query_vars_from_query_block( $block, $page ) {
 			$query['s'] = $block->context['query']['search'];
 		}
 		if ( ! empty( $block->context['query']['parents'] ) && is_post_type_hierarchical( $query['post_type'] ) ) {
-			$query['post_parent__in'] = array_filter( array_map( 'intval', $block->context['query']['parents'] ) );
+			$query['post_parent__in'] = array_unique( array_map( 'intval', $block->context['query']['parents'] ) );
 		}
 	}
 

tests/phpunit/tests/blocks/wpBlock.php

@@ -714,6 +714,39 @@ class Tests_Blocks_wpBlock extends WP_UnitTestCase {
 		);
 	}
 
+	/**
+	 * @ticket 62901
+	 */
+	public function test_build_query_vars_from_query_block_with_top_level_parent() {
+		$this->registry->register(
+			'core/example',
+			array( 'uses_context' => array( 'query' ) )
+		);
+
+		$parsed_blocks = parse_blocks( '<!-- wp:example {"ok":true} -->a<!-- wp:example /-->b<!-- /wp:example -->' );
+		$parsed_block  = $parsed_blocks[0];
+		$context       = array(
+			'query' => array(
+				'postType' => 'page',
+				'parents'  => array( 0 ),
+			),
+		);
+		$block         = new WP_Block( $parsed_block, $context, $this->registry );
+		$query         = build_query_vars_from_query_block( $block, 1 );
+
+		$this->assertSame(
+			array(
+				'post_type'       => 'page',
+				'order'           => 'DESC',
+				'orderby'         => 'date',
+				'post__not_in'    => array(),
+				'tax_query'       => array(),
+				'post_parent__in' => array( 0 ),
+			),
+			$query
+		);
+	}
+
 	/**
 	 * @ticket 56467
 	 */