fix : get custom fields for the respective category in dropdown

Author: shahzan01

plugins/system/opengraph/src/Extension/opengraph.php

@@ -15,17 +15,13 @@
 use Joomla\CMS\Event\Model\PrepareFormEvent;
 use Joomla\CMS\Plugin\CMSPlugin;
 use Joomla\Event\SubscriberInterface;
-use Joomla\CMS\Form\Form;
 use Joomla\CMS\Document\HtmlDocument;
-use Joomla\CMS\Table\Table;
 use Joomla\Registry\Registry;
 use Joomla\CMS\Document\Document;
 use Joomla\CMS\Opengraph\OpengraphServiceInterface;
 use Joomla\CMS\Uri\Uri;
 use Exception;
 use Joomla\CMS\Component\ComponentHelper;
-use Joomla\CMS\Table\Content;
-use Joomla\Database\DatabaseInterface;
 use Joomla\CMS\Menu\MenuItem;
 use Joomla\Component\Fields\Administrator\Helper\FieldsHelper;
 use Joomla\Component\Content\Site\Model\ArticleModel;

plugins/system/opengraph/src/Field/OpengraphField.php

@@ -90,7 +90,18 @@ protected function getGroups()
 
         $allowedTypes = $allowedFieldTypes[$fieldType] ?? [];
 
-        $customFields = FieldsHelper::getFields('com_content.article', null);
+
+
+        $catId = (int) $this->form->getValue('id');        // editing existing cat
+        if (!$catId) {
+            // Creating a new category: use the chosen parent so assignments still work
+            $catId = (int) $this->form->getValue('parent_id');
+        }
+
+        // Dummy item with catid so FieldsService filters by assignment
+        $scopeItem = $catId ? (object) ['catid' => $catId] : null;
+
+        $customFields = FieldsHelper::getFields('com_content.article', $scopeItem);
         $customOptions = [];
 
         foreach ($customFields as $field) {