Improvements

Classes/Utility/MigrationUtility.php

@@ -331,6 +331,7 @@ protected function copyTemplate(array $dceConfiguration, LoadedContentBlock $con
         }
 
         if ($templateContent) {
+            $templateContent = str_replace('field.', 'data.', $templateContent);
             GeneralUtility::writeFile(GeneralUtility::getFileAbsFileName($contentBlock->getExtPath() . '/' . $contentBlock->getPackage() . '/' . ContentBlockPathUtility::getFrontendTemplatePath()), $templateContent);
         }
     }

Classes/Utility/UpgradeUtility.php

@@ -54,7 +54,11 @@ public function migrateContentElements(Result $result, array $migrationInstructi
             foreach ($dceFields as $dceField) {
                 $oldField = $dceField['variable'];
                 $migrationInstruction = $migrationInstructions['fields'][$oldField] ?? [];
-                $newFieldName = $migrationInstruction['fieldName'] ?? $oldField;
+                if ($migrationInstruction['fieldName']) {
+                    $newFieldName = $migrationInstruction['fieldName'];
+                } else {
+                    $newFieldName = $dceField['map_to'] !== '' ? $dceField['map_to'] : UniqueIdentifierCreator::createContentTypeIdentifier($migrationInstructions['vendor'] . '/' . $migrationInstructions['identifier']) . '_' . $oldField;
+                }
 
                 if (($migrationInstruction['skip'] ?? false) || (int) $dceField['type'] === 1) {
                     continue;
@@ -232,7 +236,7 @@ protected function addDataForField(array &$data, array $record, string $oldField
                         'identifier' => [
                             'uid_foreign' => $record['uid'],
                             'tablenames' => $record['tableName'] ?? 'tt_content',
-                            'fieldname' => 'settings.' . $oldFieldName,
+                            'fieldname' => $oldFieldName,
                         ]
                     ]
                 ],

README.md

@@ -0,0 +1,22 @@
+# Minimal Configuration
+*<sitepackage>/Configuration/DceMigration.php*
+```php
+<?php
+
+
+/**
+ * @var \TYPO3\CMS\Core\Package\PackageManager $packageManager
+ */
+$packageManager = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(\TYPO3\CMS\Core\Package\PackageManager::class);
+$package = $packageManager->getPackage('<sitepackage>');
+
+return [
+    '<DCE IDENTIFIER>' => [
+        'vendor' => '<VENDOR>',
+        'identifier' => '<CONTENT BLOCKS IDENTIFIER>',
+        'package' => $package,
+    ],
+    // ... your dce_elements
+];
+
+```