(fix): register related collection ID mappings and update migration lib

- getDatabasesDB now registers mappings for related collections from
  relationship attributes, not just the primary collection. This fixes
  testOneToOneRelationship where nested documents showed internal names.
- Update utopia-php/migration to handle Index objects in createCollection.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/init/resources.php

@@ -776,12 +776,40 @@ Http::setResource('getDatabasesDB', function (Group $pools, Cache $cache, Docume
 
         // Register collection ID mapping if collection document is provided
         if ($collection !== null && !$collection->isEmpty()) {
+            $dbSeq = $originalDatabase->getSequence();
+            $dbPrefix = 'database_' . $dbSeq;
             $seq = $collection->getSequence();
             if ($seq !== null) {
-                $dbPrefix = 'database_' . $originalDatabase->getSequence();
                 $metadata->setCollectionId('collection_' . $seq, $collection->getId());
                 $metadata->setCollectionId($dbPrefix . '_collection_' . $seq, $collection->getId());
             }
+
+            // Also register related collections from relationship attributes
+            $attributes = $collection->getAttribute('attributes', []);
+            foreach ($attributes as $attr) {
+                if ($attr->getAttribute('type') !== \Utopia\Query\Schema\ColumnType::Relationship->value) {
+                    continue;
+                }
+                $options = $attr->getAttribute('options', []);
+                $relatedId = \is_array($options) ? ($options['relatedCollection'] ?? null) : null;
+                $relatedId ??= $attr->getAttribute('relatedCollection');
+                if ($relatedId === null) {
+                    continue;
+                }
+                // Look up the related collection from dbForProject
+                $relatedCol = $authorization->skip(
+                    fn () => $dbForProject->silent(
+                        fn () => $dbForProject->getDocument($dbPrefix, $relatedId)
+                    )
+                );
+                if (!$relatedCol->isEmpty()) {
+                    $relSeq = $relatedCol->getSequence();
+                    if ($relSeq !== null) {
+                        $metadata->setCollectionId('collection_' . $relSeq, $relatedCol->getId());
+                        $metadata->setCollectionId($dbPrefix . '_collection_' . $relSeq, $relatedCol->getId());
+                    }
+                }
+            }
         }
 
         $database

composer.lock

@@ -4708,12 +4708,12 @@
             "source": {
                 "type": "git",
                 "url": "https://github.com/utopia-php/migration.git",
-                "reference": "7c0e2d4f065c72f8b8424bbc06cb4aecbf28915a"
+                "reference": "1bc59979ee7a1af5f98333f277cad27785ef30c1"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/utopia-php/migration/zipball/7c0e2d4f065c72f8b8424bbc06cb4aecbf28915a",
-                "reference": "7c0e2d4f065c72f8b8424bbc06cb4aecbf28915a",
+                "url": "https://api.github.com/repos/utopia-php/migration/zipball/1bc59979ee7a1af5f98333f277cad27785ef30c1",
+                "reference": "1bc59979ee7a1af5f98333f277cad27785ef30c1",
                 "shasum": ""
             },
             "require": {
@@ -4773,7 +4773,7 @@
                 "source": "https://github.com/utopia-php/migration/tree/feat-query-lib",
                 "issues": "https://github.com/utopia-php/migration/issues"
             },
-            "time": "2026-03-31T11:14:26+00:00"
+            "time": "2026-04-01T14:01:14+00:00"
         },
         {
             "name": "utopia-php/mongo",