REST API: Allow querying for multiple `slug` values.

Props jnylen0, rachelbaker.
Fixes #38579.

Built from https://develop.svn.wordpress.org/trunk@39093


git-svn-id: http://core.svn.wordpress.org/trunk@39035 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php

@@ -169,7 +169,7 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 			'parent'         => 'post_parent__in',
 			'parent_exclude' => 'post_parent__not_in',
 			'search'         => 's',
-			'slug'           => 'name',
+			'slug'           => 'post_name__in',
 			'status'         => 'post_status',
 		);
 
@@ -882,6 +882,7 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 			'post_parent__not_in',
 			'posts_per_page',
 			'date_query',
+			'post_name__in',
 		);
 
 		$valid_vars = array_merge( $valid_vars, $rest_valid );
@@ -2112,9 +2113,9 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 		}
 
 		$params['slug'] = array(
-			'description'       => __( 'Limit result set to posts with a specific slug.' ),
-			'type'              => 'string',
-			'validate_callback' => 'rest_validate_request_arg',
+			'description'       => __( 'Limit result set to posts with one or more specific slugs.' ),
+			'type'              => 'array',
+			'sanitize_callback' => 'wp_parse_slug_list',
 		);
 
 		$params['status'] = array(

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.7-beta1-39092';
+$wp_version = '4.7-beta1-39093';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.