[6.x] Give reference updater fields the item being updated as their parent

src/Data/DataReferenceUpdater.php

@@ -85,7 +85,23 @@ public function updateReferences($originalValue, $newValue)
      */
     protected function getTopLevelFields()
     {
-        return $this->item->blueprint()->fields()->all();
+        return $this->fieldsWithItemAsParent($this->item->blueprint()->fields());
+    }
+
+    /**
+     * While updating references, the parent of every field is the item being updated.
+     *
+     * Blueprints hand back a Fields instance that's cached globally by handle, and nested fields
+     * are constructed without a parent at all, so neither can be relied upon to have the right
+     * one. The fields are cloned rather than mutated in place, otherwise the item would leak
+     * into every other consumer of that blueprint for the rest of the request.
+     *
+     * @param  \Statamic\Fields\Fields  $fields
+     * @return \Illuminate\Support\Collection
+     */
+    private function fieldsWithItemAsParent($fields)
+    {
+        return $fields->all()->map(fn ($field) => (clone $field)->setParent($this->item));
     }
 
     /**
@@ -120,7 +136,7 @@ protected function fieldsWithReferenceUpdates($fields)
      */
     public function processNestedFields($fields, $dottedPrefix): void
     {
-        $this->recursivelyUpdateFields($fields->all(), $dottedPrefix);
+        $this->recursivelyUpdateFields($this->fieldsWithItemAsParent($fields), $dottedPrefix);
     }
 
     /**

tests/Data/DataReferenceUpdaterTest.php

@@ -0,0 +1,120 @@
+<?php
+
+namespace Tests\Data;
+
+use PHPUnit\Framework\Attributes\Test;
+use Statamic\Assets\AssetReferenceUpdater;
+use Statamic\Facades;
+use Statamic\Fields\Fieldtype;
+use Statamic\Fieldtypes\UpdatesReferences;
+use Tests\PreventSavingStacheItemsToDisk;
+use Tests\TestCase;
+
+class DataReferenceUpdaterTest extends TestCase
+{
+    use PreventSavingStacheItemsToDisk;
+
+    public function setUp(): void
+    {
+        parent::setUp();
+
+        ParentRecorderFieldtype::register();
+        ParentRecorderFieldtype::$parents = [];
+
+        tap(Facades\Collection::make('articles'))->save();
+    }
+
+    #[Test]
+    public function it_gives_top_level_fields_the_item_being_updated_as_their_parent()
+    {
+        $this->setInBlueprints('collections/articles', [
+            'fields' => [
+                ['handle' => 'hero', 'field' => ['type' => 'parent_recorder']],
+            ],
+        ]);
+
+        $one = tap(Facades\Entry::make()->collection('articles')->slug('one')->data(['hero' => 'hoff.jpg']))->save();
+        $two = tap(Facades\Entry::make()->collection('articles')->slug('two')->data(['hero' => 'hoff.jpg']))->save();
+
+        $this->updateReferences($one);
+        $this->updateReferences($two);
+
+        $this->assertCount(2, ParentRecorderFieldtype::$parents);
+        $this->assertSame($one, ParentRecorderFieldtype::$parents[0]);
+        $this->assertSame($two, ParentRecorderFieldtype::$parents[1]);
+    }
+
+    #[Test]
+    public function it_gives_nested_fields_the_item_being_updated_as_their_parent()
+    {
+        $this->setInBlueprints('collections/articles', [
+            'fields' => [
+                [
+                    'handle' => 'grid',
+                    'field' => [
+                        'type' => 'grid',
+                        'fields' => [
+                            ['handle' => 'hero', 'field' => ['type' => 'parent_recorder']],
+                        ],
+                    ],
+                ],
+            ],
+        ]);
+
+        $entry = tap(Facades\Entry::make()->collection('articles')->slug('one')->data([
+            'grid' => [['hero' => 'hoff.jpg']],
+        ]))->save();
+
+        $this->updateReferences($entry);
+
+        $this->assertCount(1, ParentRecorderFieldtype::$parents);
+        $this->assertSame($entry, ParentRecorderFieldtype::$parents[0]);
+    }
+
+    #[Test]
+    public function it_doesnt_leave_the_item_on_the_blueprints_shared_fields()
+    {
+        $this->setInBlueprints('collections/articles', [
+            'fields' => [
+                ['handle' => 'hero', 'field' => ['type' => 'parent_recorder']],
+            ],
+        ]);
+
+        $entry = tap(Facades\Entry::make()->collection('articles')->slug('one')->data(['hero' => 'hoff.jpg']))->save();
+
+        $blueprint = Facades\Collection::find('articles')->entryBlueprint();
+        $blueprint->setParent(null);
+
+        $this->updateReferences($entry);
+
+        $this->assertNull($blueprint->fields()->get('hero')->parent());
+    }
+
+    private function setInBlueprints($namespace, $blueprintContents)
+    {
+        $blueprint = tap(Facades\Blueprint::make('set-in-blueprints')->setContents($blueprintContents))->save();
+
+        Facades\Blueprint::shouldReceive('in')->with($namespace)->andReturn(collect([$blueprint]));
+    }
+
+    private function updateReferences($item)
+    {
+        AssetReferenceUpdater::item($item)
+            ->filterByContainer('test_container')
+            ->updateReferences('hoff.jpg', 'norris.jpg');
+    }
+}
+
+class ParentRecorderFieldtype extends Fieldtype
+{
+    use UpdatesReferences;
+
+    public static $parents = [];
+
+    public function replaceAssetReferences($data, ?string $newValue, string $oldValue, string $container)
+    {
+        static::$parents[] = $this->field->parent();
+
+        return $data;
+    }
+}