v1.3

index.php

@@ -2,15 +2,15 @@
 
 /**
  * @package REST_API_Custom_Fields
- * @version 1.2
+ * @version 1.3
  */
 
 /*
 Plugin Name: REST API Custom Fields
 Description: Enhances Wordpress REST API v2 about metadata
 Author: Integromat
 Author URI: https://www.integromat.com/
-Version: 1.2
+Version: 1.3
 */
 
 define('IMAPIE_FIELD_PREFIX', 'integromat_api_field_');

readme.txt

@@ -2,16 +2,15 @@
 Contributors: integromat
 Tags: rest, api, rest api, endpoint, endpoints, meta, data, meta_data, integromat
 Requires at least: 5.0
-Tested up to: 5.3
+Tested up to: 5.5
 Requires PHP: 5.6
-Stable tag: 1.2
+Stable tag: 1.3
 License: GPLv2 or later
 
 This plugin enhances Wordpress REST API v2 responses about metadata
 
 == Description ==
 This plugin enhances Wordpress REST API v2 responses about metadata.
-The metadata enhancement is available only for this wordpress core object types: post, comment, user, term
 
 == Installation ==
 1. Upload "rest-api-custom-fields" folder to the "/wp-content/plugins/" directory.
@@ -20,6 +19,9 @@ The metadata enhancement is available only for this wordpress core object types:
 
 == Changelog ==
 
+= 1.3 =
+* It is now possible to expose custom fields of custom post types
+
 = 1.2 =
 * Exposed values can now contain arrays
 * Attributes representing custom fields moved directly under the top-level node in the response

response/response.php

@@ -1,25 +1,77 @@
 <?php defined( 'ABSPATH' ) or die( 'No direct access allowed' );
 
 add_action('rest_api_init', function () {
-	$objectTypes = ['post', 'comment', 'user', 'term'];
 
-	foreach ($objectTypes as $objectType) {
-		$objectTypeMetaItems = get_option('integromat_api_options_' . $objectType);
+	$mainObjectTypes = ['post', 'comment', 'user', 'term'];
+	$metaPostTypes = getMetafieldsWithPostTypes();
+
+	foreach ($mainObjectTypes as $mainObjectType) {
+		$mainObjectTypeMetaItems = get_option('integromat_api_options_' . $mainObjectType);
+
+		if (!empty($mainObjectTypeMetaItems)) {
+			foreach ($mainObjectTypeMetaItems as $metaItemFull => $val) {
 
-		if (!empty($objectTypeMetaItems)) {
-			foreach ($objectTypeMetaItems as $metaItemFull => $val) {
 				$metaItem = str_replace(IMAPIE_FIELD_PREFIX, '', $metaItemFull);
 
-				register_rest_field(
-					$objectType,
-					$metaItem,
-					[
-						'get_callback' => function ($object, $field_name, $request) use ($objectType) {
-							return get_metadata($objectType, $object['id'], $field_name, true);
+				if ($mainObjectType == 'post') {
+					if (isset($metaPostTypes[$metaItem])) {
+						foreach ($metaPostTypes[$metaItem] as $postTypeOfTheMetafield) {
+							register_rest_field(
+								$postTypeOfTheMetafield,
+								$metaItem,
+								[
+									'get_callback' => function ($object, $fieldName, $request) use ($mainObjectType) {
+										return get_metadata($mainObjectType, $object['id'], $fieldName, true);
+									}
+								]
+							);
 						}
-					]
-				);
+					}
+				} else {
+					register_rest_field(
+						$mainObjectType,
+						$metaItem,
+						[
+							'get_callback' => function ($object, $fieldName, $request) use ($mainObjectType) {
+								return get_metadata($mainObjectType, $object['id'], $fieldName, true);
+							}
+						]
+					);
+				}
+
+
 			}
 		}
 	}
-});
+});
+
+
+/**
+ * Gets all metafields with array of post types it is related to.
+ * @return array
+ */
+function getMetafieldsWithPostTypes()
+{
+	global $wpdb;
+	$query = "
+		SELECT
+			p.post_type,
+			m.meta_key
+		FROM ". $wpdb->base_prefix ."postmeta m
+		INNER JOIN ". $wpdb->base_prefix ."posts p ON p.ID = m.post_id
+		ORDER BY
+			post_type,
+			meta_key
+	";
+	$metaItems = $wpdb->get_results($query);
+
+	$out = [];
+	if (!empty($metaItems)) {
+		foreach ($metaItems as $metaItem) {
+			if (!isset($out[$metaItem->meta_key]) || !in_array($metaItem->post_type, $out[$metaItem->meta_key])) {
+				$out[$metaItem->meta_key][] = $metaItem->post_type;
+			}
+	    }
+	}
+	return $out;
+}