Add support for nested paragraphs

Proposed Resolution

Refactors the The \Drupal\quick_node_clone\Entity\QuickNodeCloneEntityFormBuilder::cloneParagraphs function to be recursive so that the logic can be applied to nested paragraphs as well.

Closes #3183249

src/Entity/QuickNodeCloneEntityFormBuilder.php

@@ -3,6 +3,7 @@
 namespace Drupal\quick_node_clone\Entity;
 
 use Drupal\Core\Config\ConfigFactoryInterface;
+use Drupal\Core\Entity\ContentEntityInterface;
 use Drupal\Core\Entity\EntityFormBuilder;
 use Drupal\Core\Entity\EntityInterface;
 use Drupal\Core\Entity\EntityTypeBundleInfoInterface;
@@ -205,25 +206,25 @@ class QuickNodeCloneEntityFormBuilder extends EntityFormBuilder {
   }
 
   /**
-   * Clone the paragraphs of a node.
+   * Clone the paragraphs of an entity.
    *
-   * If we do not clone the paragraphs attached to the node, the linked
-   * paragraphs would be linked to two nodes which is not ideal.
+   * If we do not clone the paragraphs attached to the entity, the linked
+   * paragraphs would be linked to two entities which is not ideal.
    *
-   * @param \Drupal\node\Entity\Node $node
-   *   The node to clone.
+   * @param \Drupal\Core\Entity\ContentEntityInterface $entity
+   *   The entity to clone paragraphs for.
    *
-   * @return \Drupal\node\Entity\Node
-   *   The node with cloned paragraph fields.
+   * @return \Drupal\Core\Entity\ContentEntityInterface $entity
+   *   The entity with cloned paragraph fields.
    */
-  public function cloneParagraphs(Node $node) {
-    foreach ($node->getFieldDefinitions() as $field_definition) {
+  public function cloneParagraphs(ContentEntityInterface $entity) {
+    foreach ($entity->getFieldDefinitions() as $field_definition) {
       $field_storage_definition = $field_definition->getFieldStorageDefinition();
       $field_settings = $field_storage_definition->getSettings();
       $field_name = $field_storage_definition->getName();
       if (isset($field_settings['target_type']) && $field_settings['target_type'] == "paragraph") {
-        if (!$node->get($field_name)->isEmpty()) {
-          foreach ($node->get($field_name) as $value) {
+        if (!$entity->get($field_name)->isEmpty()) {
+          foreach ($entity->get($field_name) as $value) {
             if ($value->entity) {
               $value->entity = $value->entity->createDuplicate();
               foreach ($value->entity->getFieldDefinitions() as $field_definition) {
@@ -237,6 +238,11 @@ class QuickNodeCloneEntityFormBuilder extends EntityFormBuilder {
                 }
 
                 $this->moduleHandler->alter('cloned_node_paragraph_field', $value->entity, $pfield_name, $pfield_settings);
+
+                if (isset($pfield_settings['target_type']) && $pfield_settings['target_type'] == "paragraph" && !empty($value->entity->{$pfield_name})) {
+                  // Do the same for any nested paragraphs.
+                  self::cloneParagraphs($value->entity);
+                }
               }
             }
           }
@@ -244,7 +250,7 @@ class QuickNodeCloneEntityFormBuilder extends EntityFormBuilder {
       }
     }
 
-    return $node;
+    return $entity;
   }
 
   /**