WP-API
diff --git a/Collapse file
‎lib/endpoints/class-wp-rest-posts-controller.php‎
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+11Lines changed: 11 additions & 0 deletions b/Collapse file
‎lib/endpoints/class-wp-rest-posts-controller.php‎
Copy file name to clipboardExpand all lines: lib/endpoints/class-wp-rest-posts-controller.php
+11Lines changed: 11 additions & 0 deletions
diff --git a/Collapse file
‎tests/test-rest-pages-controller.php‎
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+37Lines changed: 37 additions & 0 deletions b/Collapse file
‎tests/test-rest-pages-controller.php‎
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+37Lines changed: 37 additions & 0 deletions
diff --git a/Collapse file
‎tests/test-rest-posts-controller.php‎
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+20Lines changed: 20 additions & 0 deletions b/Collapse file
‎tests/test-rest-posts-controller.php‎
Copy file name to clipboardExpand all lines: tests/test-rest-posts-controller.php
+20Lines changed: 20 additions & 0 deletions
@@ -1603,6 +1603,17 @@ public function get_collection_params() {
 				'slug',
 			),
 		);
+
+		$post_type_obj = get_post_type_object( $this->post_type );
+		if ( $post_type_obj->hierarchical ) {
+			$params['parent'] = array(
+				'description'       => _( 'Limit result set to that of a specific parent id.' ),
+				'type'              => 'integer',
+				'sanitize_callback' => 'absint',
+				'default'           => null,
+			);
+		}
+
 		$params['status'] = array(
 			'default'           => 'attachment' === $this->post_type ? 'inherit' : 'publish',
 			'description'       => __( 'Limit result set to posts assigned a specific status.' ),
 
@@ -43,10 +43,47 @@ public function test_context_param() {
 		$this->assertEquals( array( 'view', 'embed', 'edit' ), $data['endpoints'][0]['args']['context']['enum'] );
 	}
 
+	public function test_registered_query_params() {
+		$request = new WP_REST_Request( 'OPTIONS', '/wp/v2/pages' );
+		$response = $this->server->dispatch( $request );
+		$data = $response->get_data();
+		$keys = array_keys( $data['endpoints'][0]['args'] );
+		sort( $keys );
+		$this->assertEquals( array(
+			'author',
+			'context',
+			'filter',
+			'include',
+			'order',
+			'orderby',
+			'page',
+			'parent',
+			'per_page',
+			'search',
+			'status',
+			), $keys );
+	}
+
 	public function test_get_items() {
 
 	}
 
+	public function test_get_items_parent_query() {
+		$id1 = $this->factory->post->create( array( 'post_status' => 'publish', 'post_type' => 'page' ) );
+		$id2 = $this->factory->post->create( array( 'post_status' => 'publish', 'post_type' => 'page', 'post_parent' => $id1 ) );
+		// No parent
+		$request = new WP_REST_Request( 'GET', '/wp/v2/pages' );
+		$response = $this->server->dispatch( $request );
+		$data = $response->get_data();
+		$this->assertEquals( 2, count( $data ) );
+		// Filter to parent
+		$request->set_param( 'parent', $id1 );
+		$response = $this->server->dispatch( $request );
+		$data = $response->get_data();
+		$this->assertEquals( 1, count( $data ) );
+		$this->assertEquals( $id2, $data[0]['id'] );
+	}
+
 	public function test_get_items_private_filter_query_var() {
 		// Private query vars inaccessible to unauthorized users
 		wp_set_current_user( 0 );
 
@@ -50,6 +50,26 @@ public function test_context_param() {
 		$this->assertEquals( array( 'view', 'embed', 'edit' ), $data['endpoints'][0]['args']['context']['enum'] );
 	}
 
+	public function test_registered_query_params() {
+		$request = new WP_REST_Request( 'OPTIONS', '/wp/v2/posts' );
+		$response = $this->server->dispatch( $request );
+		$data = $response->get_data();
+		$keys = array_keys( $data['endpoints'][0]['args'] );
+		sort( $keys );
+		$this->assertEquals( array(
+			'author',
+			'context',
+			'filter',
+			'include',
+			'order',
+			'orderby',
+			'page',
+			'per_page',
+			'search',
+			'status',
+			), $keys );
+	}
+
 	public function test_get_items() {
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$response = $this->server->dispatch( $request );