new: [meta-template] Improvement of the update system

- Changed default update strategy from `create_new` to `update_existing`
- Added mechanism to automatically migrate meta-fields to newest template
- Improved validation and conflict detection strategies
- Fixed various UI bugs and improved QoL

src/Controller/Component/Navigation/MetaTemplates.php

@@ -91,7 +91,7 @@ class MetaTemplatesNavigation extends BaseNavigation
             'url' => '/metaTemplates/prune_outdated_template',
         ]);
 
-        if (empty($this->viewVars['updateableTemplates']['up-to-date'])) {
+        if (empty($this->viewVars['templateStatus']['up-to-date'])) {
             $this->bcf->addAction('MetaTemplates', 'view', 'MetaTemplates', 'update', [
                 'label' => __('Update template'),
                 'url' => '/metaTemplates/update/{{id}}',

src/Controller/MetaTemplatesController.php

@@ -244,6 +244,55 @@ class MetaTemplatesController extends AppController
         $this->set('movedMetaTemplateFields', $movedMetaTemplateFields);
     }
 
+    public function migrateMetafieldsToNewestTemplate(int $template_id)
+    {
+        $oldMetaTemplate = $this->MetaTemplates->find()->where([
+            'id' => $template_id
+        ])->contain(['MetaTemplateFields'])->first();
+
+        if (empty($oldMetaTemplate)) {
+            throw new NotFoundException(__('Invalid {0} {1}.', $this->MetaTemplates->getAlias(), $template_id));
+        }
+        $newestMetaTemplate = $this->MetaTemplates->getNewestVersion($oldMetaTemplate, true);
+        if ($oldMetaTemplate->id == $newestMetaTemplate->id) {
+            throw new NotFoundException(__('Invalid {0} {1}. Template already the newest version', $this->MetaTemplates->getAlias(), $template_id));
+        }
+
+        if ($this->request->is('post')) {
+            $result = $this->MetaTemplates->migrateMetafieldsToNewestTemplate($oldMetaTemplate, $newestMetaTemplate);
+            if ($this->ParamHandler->isRest()) {
+                return $this->RestResponse->viewData($result, 'json');
+            } else {
+                if ($result['success']) {
+                    $message = __('{0} entities updated. {1} entities could not be automatically migrated.', $result['migrated_count'], $result['conflicting_entities']);
+                } else {
+                    $message = __('{0} entities updated. {1} entities could not be automatically migrated. {2} entities could not be updated due to errors', $result['migrated_count'], $result['conflicting_entities'], $result['migration_errors']);
+                }
+                $this->CRUD->setResponseForController('update', $result['success'], $message, $result, $result['migration_errors'], ['redirect' => $this->referer()]);
+                $responsePayload = $this->CRUD->getResponsePayload();
+                if (!empty($responsePayload)) {
+                    return $responsePayload;
+                }
+            }
+        } else {
+            $entities = $this->MetaTemplates->getEntitiesHavingMetaFieldsFromTemplate($oldMetaTemplate->id, null);
+            $conflictingEntities = [];
+            foreach ($entities as $entity) {
+                $conflicts = $this->MetaTemplates->getMetaFieldsConflictsUnderTemplate($entity->meta_fields, $newestMetaTemplate);
+                if (!empty($conflicts)) {
+                    $conflictingEntities[] = $entity;
+                }
+            }
+
+            if (!$this->ParamHandler->isRest()) {
+                $this->set('oldMetaTemplate', $oldMetaTemplate);
+                $this->set('newestMetaTemplate', $newestMetaTemplate);
+                $this->set('conflictingEntities', $conflictingEntities);
+                $this->set('entityCount', count($entities));
+            }
+        }
+    }
+
     public function index()
     {
         $templatesUpdateStatus = $this->MetaTemplates->getUpdateStatusForTemplates();

src/Model/Table/MetaFieldsTable.php

@@ -39,8 +39,6 @@ class MetaFieldsTable extends AppTable
             ->notEmptyString('value')
             ->notEmptyString('meta_template_id')
             ->notEmptyString('meta_template_field_id')
-            // ->requirePresence(['scope', 'field', 'value', 'uuid', 'meta_template_id', 'meta_template_field_id'], 'create');
-            // ->requirePresence(['scope', 'field', 'value', 'uuid',], 'create');
             ->notEmptyString('meta_template_directory_id')
             ->requirePresence(['scope', 'field', 'value', 'uuid', 'meta_template_directory_id', ], 'create');
 
@@ -53,10 +51,9 @@ class MetaFieldsTable extends AppTable
         return $validator;
     }
 
-    public function beforeMarshal(EventInterface $event, ArrayObject $data, ArrayObject $options)
-    {
-        if (!isset($data['meta_template_directory_id'])) {
-            $data['meta_template_directory_id'] = $this->getTemplateDirectoryIdFromMetaTemplate($data['meta_template_id']);
+    public function afterMarshal(EventInterface $event, \App\Model\Entity\MetaField $entity, ArrayObject $data, ArrayObject $options) {
+        if (!isset($entity->meta_template_directory_id)) {
+            $entity->set('meta_template_directory_id', $this->getTemplateDirectoryIdFromMetaTemplate($entity->meta_template_id));
         }
     }
 
@@ -89,6 +86,9 @@ class MetaFieldsTable extends AppTable
         if (!empty($metaTemplateField['regex'])) {
             return $this->isValidRegex($value, $metaTemplateField);
         }
+        if (!empty($metaTemplateField['values_list'])) {
+            return $this->isValidValuesList($value, $metaTemplateField);
+        }
         return true;
     }
 
@@ -118,4 +118,11 @@ class MetaFieldsTable extends AppTable
         }
         return true;
     }
+
+    public function isValidValuesList($value, $metaTemplateField)
+    {
+
+        $valuesList = $metaTemplateField['values_list'];
+        return in_array($value, $valuesList);
+    }
 }

src/Model/Table/MetaTemplatesTable.php

@@ -24,8 +24,12 @@ class MetaTemplatesTable extends AppTable
     public const UPDATE_STRATEGY_KEEP_BOTH = 'keep_both';
     public const UPDATE_STRATEGY_DELETE = 'delete_all';
 
-    public const DEFAULT_STRATEGY = MetaTemplatesTable::UPDATE_STRATEGY_CREATE_NEW;
-    public const ALLOWED_STRATEGIES = [MetaTemplatesTable::UPDATE_STRATEGY_CREATE_NEW];
+    public const DEFAULT_STRATEGY = MetaTemplatesTable::UPDATE_STRATEGY_UPDATE_EXISTING;
+    public const ALLOWED_STRATEGIES = [
+        MetaTemplatesTable::UPDATE_STRATEGY_CREATE_NEW,
+        MetaTemplatesTable::UPDATE_STRATEGY_UPDATE_EXISTING,
+        MetaTemplatesTable::UPDATE_STRATEGY_KEEP_BOTH,
+    ];
 
     private $templatesOnDisk = null;
 
@@ -73,6 +77,41 @@ class MetaTemplatesTable extends AppTable
      * @return array The update result containing potential errors and the successes
      */
     public function updateAllTemplates(): array
+    {
+        // Create new template found on the disk
+        $newTemplateResult = $this->createAllNewTemplates();
+        $files_processed = $newTemplateResult['files_processed'];
+        $updatesErrors = $newTemplateResult['update_errors'];
+
+        $templatesUpdateStatus = $this->getUpdateStatusForTemplates();
+
+        // Update all existing templates
+        foreach ($templatesUpdateStatus as $uuid => $templateUpdateStatus) {
+            if (!empty($templateUpdateStatus['existing_template'])) {
+                $metaTemplate = $templateUpdateStatus['existing_template'];
+                $result = $this->update($metaTemplate, null);
+                if ($result['success']) {
+                    $files_processed[] = $metaTemplate->uuid;
+                }
+                if (!empty($result['errors'])) {
+                    $updatesErrors[] = $result['errors'];
+                }
+            }
+        }
+        $results = [
+            'update_errors' => $updatesErrors,
+            'files_processed' => $files_processed,
+            'success' => !empty($files_processed),
+        ];
+        return $results;
+    }
+
+    /**
+     * Load the templates stored on the disk update and create them in the database without touching at the existing ones
+     *
+     * @return array The update result containing potential errors and the successes
+     */
+    public function createAllNewTemplates(): array
     {
         $updatesErrors = [];
         $files_processed = [];
@@ -106,7 +145,7 @@ class MetaTemplatesTable extends AppTable
      * @param string|null $strategy The strategy to be used when updating templates with conflicts
      * @return array The update result containing potential errors and the successes
      */
-    public function update($metaTemplate, $strategy = null): array
+    public function update(\App\Model\Entity\MetaTemplate $metaTemplate, $strategy = null): array
     {
         $files_processed = [];
         $updatesErrors = [];
@@ -114,6 +153,25 @@ class MetaTemplatesTable extends AppTable
         $templateStatus = $this->getStatusForMetaTemplate($templateOnDisk, $metaTemplate);
         $updateStatus = $this->computeFullUpdateStatusForMetaTemplate($templateStatus, $metaTemplate);
         $errors = [];
+
+        $result = $this->doUpdate($updateStatus, $templateOnDisk, $metaTemplate, $strategy);
+        if ($result['success']) {
+            $files_processed[] = $templateOnDisk['uuid'];
+        }
+        if (!empty($result['errors'])) {
+            $updatesErrors[] = $errors;
+        }
+        $results = [
+            'update_errors' => $updatesErrors,
+            'files_processed' => $files_processed,
+            'success' => !empty($files_processed),
+        ];
+        return $results;
+    }
+
+    private function doUpdate(array $updateStatus, array $templateOnDisk, \App\Model\Entity\MetaTemplate $metaTemplate, string $strategy = null): array
+    {
+        $errors = [];
         $success = false;
         if ($updateStatus['up-to-date']) {
             $errors['message'] = __('Meta-template already up-to-date');
@@ -126,22 +184,17 @@ class MetaTemplatesTable extends AppTable
             $errors['message'] = __('Cannot update meta-template, update strategy not allowed');
         } else if (!$updateStatus['up-to-date']) {
             $strategy = is_null($strategy) ? MetaTemplatesTable::DEFAULT_STRATEGY : $strategy;
+            if ($strategy == MetaTemplatesTable::UPDATE_STRATEGY_UPDATE_EXISTING && !$updateStatus['automatically-updateable']) {
+                $strategy = MetaTemplatesTable::UPDATE_STRATEGY_KEEP_BOTH;
+            }
             $success = $this->updateMetaTemplateWithStrategyRouter($metaTemplate, $templateOnDisk, $strategy, $errors);
         } else {
             $errors['message'] = __('Could not update. Something went wrong.');
         }
-        if ($success) {
-            $files_processed[] = $templateOnDisk['uuid'];
-        }
-        if (!empty($errors)) {
-            $updatesErrors[] = $errors;
-        }
-        $results = [
-            'update_errors' => $updatesErrors,
-            'files_processed' => $files_processed,
-            'success' => !empty($files_processed),
+        return [
+            'success' => $success,
+            'errors' => $errors,
         ];
-        return $results;
     }
 
     /**
@@ -764,13 +817,27 @@ class MetaTemplatesTable extends AppTable
             $errors[] = new UpdateError(false, $metaTemplate);
             return false;
         }
-        $metaTemplate = $this->patchEntity($metaTemplate, $template, [
-            'associated' => ['MetaTemplateFields']
-        ]);
+        $metaTemplate = $this->patchEntity($metaTemplate, $template);
+        foreach ($template['metaFields'] as $newMetaField) {
+            $newMetaField['__patched'] = true;
+            foreach($metaTemplate->meta_template_fields as $i => $oldMetaField) {
+                if ($oldMetaField->field == $newMetaField['field']) {
+                    $metaTemplate->meta_template_fields[$i] = $this->MetaTemplateFields->patchEntity($oldMetaField, $newMetaField);
+                    continue 2;
+                }
+            }
+            $metaTemplate->meta_template_fields[] = $this->MetaTemplateFields->newEntity($newMetaField);
+        }
+        $metaTemplate->setDirty('meta_template_fields', true);
         $metaTemplate = $this->save($metaTemplate, [
             'associated' => ['MetaTemplateFields']
         ]);
-        if (!empty($metaTemplate)) {
+        foreach ($metaTemplate->meta_template_fields as $savedMetafield) {
+            if (empty($savedMetafield['__patched'])) {
+                $this->MetaTemplateFields->delete($savedMetafield);
+            }
+        }
+        if (empty($metaTemplate)) {
             $errors[] = new UpdateError(false, __('Could not save the template.'), $metaTemplate->getErrors());
             return false;
         }
@@ -797,8 +864,8 @@ class MetaTemplatesTable extends AppTable
         }
         if ($strategy == MetaTemplatesTable::UPDATE_STRATEGY_KEEP_BOTH) {
             $result = $this->executeStrategyKeep($template, $metaTemplate);
-        } else if ($strategy == MetaTemplatesTable::UPDATE_STRATEGY_DELETE) {
-            $result = $this->executeStrategyDeleteAll($template, $metaTemplate);
+        } else if ($strategy == MetaTemplatesTable::UPDATE_STRATEGY_UPDATE_EXISTING) {
+            $result = $this->updateMetaTemplate($metaTemplate, $template);
         } else if ($strategy == MetaTemplatesTable::UPDATE_STRATEGY_CREATE_NEW) {
             $result = $this->executeStrategyCreateNew($template, $metaTemplate);
         } else {
@@ -830,6 +897,7 @@ class MetaTemplatesTable extends AppTable
             $errors[] = new UpdateError(false, __('Could not save the template. A template with this UUID and version already exists'), ['A template with UUID and version already exists']);
         }
         $conflicts = $this->getMetaTemplateConflictsForMetaTemplate($metaTemplate, $template);
+        $conflictingEntities = Hash::combine($conflicts, '{s}.conflictingEntities.{n}.parent_id', '{s}.conflictingEntities.{n}.parent_id');
         $blockingConflict = Hash::extract($conflicts, '{s}.conflicts');
         $errors = [];
         if (empty($blockingConflict)) { // No conflict, everything can be updated without special care
@@ -838,7 +906,6 @@ class MetaTemplatesTable extends AppTable
         }
         $entities = $this->getEntitiesHavingMetaFieldsFromTemplate($metaTemplate->id, null);
 
-        $conflictingEntities = [];
         foreach ($entities as $entity) {
             $conflicts = $this->getMetaFieldsConflictsUnderTemplate($entity['meta_fields'], $template);
             if (!empty($conflicts)) {
@@ -849,8 +916,9 @@ class MetaTemplatesTable extends AppTable
             $this->updateMetaTemplate($metaTemplate, $template, $errors);
             return !empty($errors) ? $errors[0] : true;
         }
-        $template['is_default'] = $metaTemplate['is_default'];
-        $template['enabled'] = $metaTemplate['enabled'];
+        $template['is_default'] = $metaTemplate->is_default;
+        $template['enabled'] = $metaTemplate->enabled;
+        $metaTemplate->set('enabled', false);
         if ($metaTemplate->is_default) {
             $metaTemplate->set('is_default', false);
             $this->save($metaTemplate);
@@ -858,13 +926,9 @@ class MetaTemplatesTable extends AppTable
         $savedMetaTemplate = null;
         $this->saveNewMetaTemplate($template, $errors, $savedMetaTemplate);
         if (!empty($savedMetaTemplate)) {
-            $savedMetaTemplateFieldByName = Hash::combine($savedMetaTemplate['meta_template_fields'], '{n}.field', '{n}');
             foreach ($entities as $entity) {
                 if (empty($conflictingEntities[$entity->id])) { // conflicting entities remain untouched
-                    foreach ($entity['meta_fields'] as $metaField) {
-                        $savedMetaTemplateField = $savedMetaTemplateFieldByName[$metaField->field];
-                        $this->supersedeMetaFieldWithMetaTemplateField($metaField, $savedMetaTemplateField);
-                    }
+                    $this->supersedeMetaFieldsWithMetaTemplateField($entity['meta_fields'], $savedMetaTemplate);
                 }
             }
         } else {
@@ -873,6 +937,44 @@ class MetaTemplatesTable extends AppTable
         return true;
     }
 
+    public function migrateMetafieldsToNewestTemplate(\App\Model\Entity\MetaTemplate $oldMetaTemplate, \App\Model\Entity\MetaTemplate $newestMetaTemplate): array
+    {
+        $result = [
+            'success' => true,
+            'migrated_count' => 0,
+            'conflicting_entities' => 0,
+            'migration_errors' => 0,
+        ];
+
+        $entities = $this->getEntitiesHavingMetaFieldsFromTemplate($oldMetaTemplate->id, null);
+        if (empty($entities)) {
+            return $result;
+        }
+
+        $successfullyMigratedEntities = 0;
+        $migrationErrors = 0;
+        $conflictingEntities = [];
+        foreach ($entities as $entity) {
+            $conflicts = $this->getMetaFieldsConflictsUnderTemplate($entity->meta_fields, $newestMetaTemplate);
+            if (!empty($conflicts)) {
+                $conflictingEntities[] = $entity->id;
+            } else {
+                $success = $this->supersedeMetaFieldsWithMetaTemplateField($entity->meta_fields, $newestMetaTemplate);
+                if ($success) {
+                    $successfullyMigratedEntities += 1;
+                } else {
+                    $migrationErrors += 1;
+                }
+            }
+        }
+
+        $result['success'] = $migrationErrors == 0;
+        $result['migrated_count'] = $successfullyMigratedEntities;
+        $result['conflicting_entities'] = count($conflictingEntities);
+        $result['migration_errors'] = $migrationErrors;
+        return $result;
+    }
+
     /**
      * Execute the `delete_all` update strategy by updating the meta-template and deleting all conflicting meta-fields.
      * Strategy:
@@ -941,16 +1043,20 @@ class MetaTemplatesTable extends AppTable
     /**
      * Supersede a meta-fields's meta-template-field with the provided one.
      *
-     * @param \App\Model\Entity\MetaField $metaField
+     * @param array $metaFields
      * @param \App\Model\Entity\MetaTemplateField $savedMetaTemplateField
      * @return bool True if the replacement was a success, False otherwise
      */
-    public function supersedeMetaFieldWithMetaTemplateField(\App\Model\Entity\MetaField $metaField,  \App\Model\Entity\MetaTemplateField $savedMetaTemplateField): bool
+    public function supersedeMetaFieldsWithMetaTemplateField(array $metaFields,  \App\Model\Entity\MetaTemplate $savedMetaTemplate): bool
     {
-        $metaField->set('meta_template_id', $savedMetaTemplateField->meta_template_id);
-        $metaField->set('meta_template_field_id', $savedMetaTemplateField->id);
-        $metaField = $this->MetaTemplateFields->MetaFields->save($metaField);
-        return !empty($metaField);
+        $savedMetaTemplateFieldByName = Hash::combine($savedMetaTemplate['meta_template_fields'], '{n}.field', '{n}');
+        foreach ($metaFields as $i => $metaField) {
+            $savedMetaTemplateField = $savedMetaTemplateFieldByName[$metaField->field];
+            $metaField->set('meta_template_id', $savedMetaTemplateField->meta_template_id);
+            $metaField->set('meta_template_field_id', $savedMetaTemplateField->id);
+        }
+        $entities = $this->MetaTemplateFields->MetaFields->saveMany($metaFields);
+        return !empty($entities);
     }
 
     /**
@@ -977,13 +1083,14 @@ class MetaTemplatesTable extends AppTable
             $metaTemplateFieldByName[$metaTemplateField['field']] = $this->MetaTemplateFields->newEntity($metaTemplateField);
         }
         foreach ($metaFields as $metaField) {
-            if ($existingMetaTemplate && $metaField->meta_template_id != $template->id) {
-                continue;
+            if (empty($metaTemplateFieldByName[$metaField->field])) { // Meta-field was removed from the template
+                $isValid = false;
+            } else {
+                $isValid = $this->MetaTemplateFields->MetaFields->isValidMetaFieldForMetaTemplateField(
+                    $metaField->value,
+                    $metaTemplateFieldByName[$metaField->field]
+                );
             }
-            $isValid = $this->MetaTemplateFields->MetaFields->isValidMetaFieldForMetaTemplateField(
-                $metaField->value,
-                $metaTemplateFieldByName[$metaField->field]
-            );
             if ($isValid !== true) {
                 $conflicting[] = $metaField;
             }
@@ -1027,27 +1134,12 @@ class MetaTemplatesTable extends AppTable
                 $result['conflictingEntities'] = Hash::extract($conflictingStatus, '{n}.parent_id');
             }
         }
-        if (!empty($templateField['regex']) && $templateField['regex'] != $metaTemplateField->regex) {
-            $entitiesWithMetaFieldQuery = $this->MetaTemplateFields->MetaFields->find();
-            $entitiesWithMetaFieldQuery
-                ->enableHydration(false)
-                ->select([
-                    'parent_id',
-                ])
-                ->where([
-                    'meta_template_field_id' => $metaTemplateField->id,
-                ]);
-            $entitiesTable = $this->getTableForMetaTemplateScope($scope);
-            $entities = $entitiesTable->find()
-                ->where(['id IN' => $entitiesWithMetaFieldQuery])
-                ->contain([
-                    'MetaFields' => [
-                        'conditions' => [
-                            'MetaFields.meta_template_field_id' => $metaTemplateField->id
-                        ]
-                    ]
-                ])
-                ->all()->toList();
+
+        if (
+            (!empty($templateField['regex']) && $templateField['regex'] != $metaTemplateField->regex) ||
+            !empty($templateField['values_list'])
+        ) {
+            $entities = $this->getEntitiesForMetaTemplateField($scope, $metaTemplateField->id, true);
             $conflictingEntities = [];
             foreach ($entities as $entity) {
                 foreach ($entity['meta_fields'] as $metaField) {
@@ -1056,7 +1148,10 @@ class MetaTemplatesTable extends AppTable
                         $templateField
                     );
                     if ($isValid !== true) {
-                        $conflictingEntities[] = $entity->id;
+                        $conflictingEntities[] = [
+                            'parent_id' => $entity->id,
+                            'meta_template_field_id' => $metaTemplateField->id,
+                        ];
                         break;
                     }
                 }
@@ -1064,13 +1159,50 @@ class MetaTemplatesTable extends AppTable
 
             if (!empty($conflictingEntities)) {
                 $result['automatically-updateable'] = $result['automatically-updateable'] && false;
-                $result['conflicts'][] = __('This field is instantiated with values not passing the validation anymore');
+                $result['conflicts'][] = __('This field is instantiated with values not passing the validation anymore.');
                 $result['conflictingEntities'] = array_merge($result['conflictingEntities'], $conflictingEntities);
             }
         }
         return $result;
     }
 
+    /**
+     * Return all entities having the meta-fields using the provided meta-template-field.
+     *
+     * @param string $scope
+     * @param integer $metaTemplateFieldID The ID of the matching meta-template-field
+     * @param boolean $includeMatchingMetafields Should the entities also include the matching meta-fields
+     * @return array
+     */
+    private function getEntitiesForMetaTemplateField(string $scope, int $metaTemplateFieldID, bool $includeMatchingMetafields=true): array
+    {
+        $entitiesTable = $this->getTableForMetaTemplateScope($scope);
+        $entitiesWithMetaFieldQuery = $this->MetaTemplateFields->MetaFields->find();
+        $entitiesWithMetaFieldQuery
+            ->enableHydration(false)
+            ->select([
+                'parent_id',
+            ])
+            ->where([
+                'meta_template_field_id' => $metaTemplateFieldID,
+            ]);
+
+        $entitiesQuery = $entitiesTable->find()
+            ->where(['id IN' => $entitiesWithMetaFieldQuery]);
+
+        if ($includeMatchingMetafields) {
+            $entitiesQuery->contain([
+                'MetaFields' => [
+                    'conditions' => [
+                        'MetaFields.meta_template_field_id' => $metaTemplateFieldID,
+                    ]
+                ]
+            ]);
+        }
+
+        return $entitiesQuery->all()->toList();
+    }
+
     /**
      * Check the conflict that would be introduced if the metaTemplate would be updated to the provided template
      *
@@ -1087,7 +1219,7 @@ class MetaTemplatesTable extends AppTable
             $templateMetaFields = $template['metaFields'];
         }
         $conflicts = [];
-        $existingMetaTemplateFields = Hash::combine($metaTemplate->toArray(), 'meta_template_fields.{n}.field');
+        $existingMetaTemplateFields = Hash::combine($metaTemplate->toArray(), 'meta_template_fields.{n}.field', 'meta_template_fields.{n}');
         foreach ($templateMetaFields as $newMetaField) {
             foreach ($metaTemplate->meta_template_fields as $metaField) {
                 if ($newMetaField['field'] == $metaField->field) {
@@ -1103,10 +1235,23 @@ class MetaTemplatesTable extends AppTable
             }
         }
         if (!empty($existingMetaTemplateFields)) {
-            foreach ($existingMetaTemplateFields as $field => $tmp) {
-                $conflicts[$field] = [
+            foreach ($existingMetaTemplateFields as $metaTemplateField) {
+                $query = $this->MetaTemplateFields->MetaFields->find();
+                $query
+                    ->enableHydration(false)
+                    ->select([
+                        'parent_id',
+                        'meta_template_field_id',
+                    ])
+                    ->where([
+                        'meta_template_field_id' => $metaTemplateField['id'],
+                    ])
+                    ->group(['parent_id']);
+                $entityWithMetafieldToBeRemoved = $query->all()->toList();
+                $conflicts[$metaTemplateField['field']] = [
                     'automatically-updateable' => false,
                     'conflicts' => [__('This field is intended to be removed')],
+                    'conflictingEntities' => $entityWithMetafieldToBeRemoved,
                 ];
             }
         }
@@ -1159,9 +1304,9 @@ class MetaTemplatesTable extends AppTable
         $updateStatus['current_version'] = $metaTemplate->version;
         $updateStatus['next_version'] = $template['version'];
         $updateStatus['new'] = false;
+        $updateStatus['automatically-updateable'] = false;
         if ($metaTemplate->version >= $template['version']) {
             $updateStatus['up-to-date'] = true;
-            $updateStatus['automatically-updateable'] = false;
             $updateStatus['conflicts'][] = __('Could not update the template. Local version is equal or newer.');
             return $updateStatus;
         }
@@ -1169,6 +1314,17 @@ class MetaTemplatesTable extends AppTable
         $conflicts = $this->getMetaTemplateConflictsForMetaTemplate($metaTemplate, $template);
         if (!empty($conflicts)) {
             $updateStatus['conflicts'] = $conflicts;
+            $updateStatus['automatically-updateable'] = false;
+            $emptySum = 0;
+            foreach ($conflicts as $fieldname => $fieldStatus) {
+                if (!empty($fieldStatus['conflictingEntities'])) {
+                    break;
+                }
+                $emptySum += 1;
+            }
+            if ($emptySum == count($conflicts)) {
+                $updateStatus['automatically-updateable'] = true;
+            }
         } else {
             $updateStatus['automatically-updateable'] = true;
         }

templates/MetaTemplates/index.php

@@ -198,10 +198,22 @@ echo $this->element('genericElements/IndexTable/index_table', [
                     }
                 ]
             ],
+            [
+                'open_modal' => '/metaTemplates/migrateMetafieldsToNewestTemplate/[onclick_params_data_path]',
+                'modal_params_data_path' => 'id',
+                'title' => __('Update meta-fields to the newest version of this meta-template'),
+                'icon' => 'arrow-circle-up',
+                'variant' => 'success',
+                'complex_requirement' => [
+                    'function' => function ($row, $options) {
+                        return !empty($row['updateStatus']['to-existing']) && empty($row['updateStatus']['can-be-removed']);
+                    }
+                ]
+            ],
             [
                 'open_modal' => '/metaTemplates/delete/[onclick_params_data_path]',
                 'modal_params_data_path' => 'id',
-                'title' => __('Get meta-fields that should be moved to the newest version of this meta-template'),
+                'title' => __('This meta-template doesn\'t have any meta-fields and can be safely removed.'),
                 'icon' => 'trash',
                 'variant' => 'success',
                 'complex_requirement' => [

templates/MetaTemplates/migrate_metafields_to_newest_template.php

@@ -0,0 +1,102 @@
+<?php
+
+use Cake\Utility\Inflector;
+use Cake\Routing\Router;
+
+$urlNewestMetaTemplate = Router::url([
+    'controller' => 'metaTemplates',
+    'action' => 'view',
+    $newestMetaTemplate->id
+]);
+
+$bodyHtml = '';
+$bodyHtml .= sprintf('<div><span>%s: </span><span class="font-monospace">%s</span></div>', __('Current version'), h($oldMetaTemplate->version));
+$bodyHtml .= sprintf('<div><span>%s: </span><a href="%s" target="_blank" class="font-monospac">%s</a></div>', __('Newest version'), $urlNewestMetaTemplate, h($newestMetaTemplate->version));
+$bodyHtml .= sprintf('<h4 class="my-2">%s</h4>', __('{0} Entities with meta-fields for the meta-template version <span class="font-monospace">{1}</span>', h($entityCount), h($oldMetaTemplate->version)));
+
+// debug($conflictingEntities);
+
+if (empty($conflictingEntities)) {
+    $bodyHtml .= $this->Bootstrap->alert([
+        'text' => __('All entities can updated automatically', count($conflictingEntities)),
+        'variant' => 'success',
+        'dismissible' => false,
+    ]);
+} else {
+    $bodyHtml .= $this->Bootstrap->alert([
+        'html' => sprintf(
+            '<ul>%s%s</ul>',
+            $this->Bootstrap->node('li', [], __('{0} entities can be updated automatically', $entityCount - count($conflictingEntities))),
+            $this->Bootstrap->node('li', [], __('{0} entities cannot be updated automatically and require manual migration', count($conflictingEntities)))
+        ),
+        'variant' => 'warning',
+        'dismissible' => false,
+    ]);
+    $bodyHtml .= '<ul>';
+    foreach ($conflictingEntities as $entity) {
+        $url = Router::url([
+            'controller' => 'metaTemplates',
+            'action' => 'migrateOldMetaTemplateToNewestVersionForEntity',
+            $oldMetaTemplate->id,
+            $entity->id,
+        ]);
+        $bodyHtml .= sprintf(
+            '<li><a href="%s" target="_blank">%s</a> <span class="fw-light">%s<span></li>',
+            $url,
+            __('{0}::{1}', h(Inflector::humanize($oldMetaTemplate->scope)), $entity->id),
+            __('has {0} meta-fields to update', count($entity->meta_fields))
+        );
+    }
+    if (count($conflictingEntities) > 10) {
+        $bodyHtml .= sprintf('<li class="list-inline-item fw-light fs-7">%s</li>', __('{0} more entities', h(10 - count($conflictingEntities))));
+    }
+    $bodyHtml .= '</ul>';
+}
+$form = sprintf(
+    '<div class="d-none hidden-form-container">%s%s</div>',
+    $this->Form->create(null, [
+        'url' => [
+            'controller' => 'MetaTemplates',
+            'action' => 'migrateMetafieldsToNewestTemplate',
+            $oldMetaTemplate->id,
+        ]
+    ]),
+    $this->Form->end()
+);
+$bodyHtml .= $form;
+
+$title = __('{0} has a new meta-template and meta-fields to be updated', sprintf('<i class="me-1">%s</i>', h($oldMetaTemplate->name)));
+if (!empty($ajax)) {
+    echo $this->Bootstrap->modal([
+        'titleHtml' => $title,
+        'bodyHtml' => $bodyHtml,
+        'size' => 'lg',
+        'type' => 'confirm',
+        'confirmButton' => [
+            'text' => __('Migrate meta-fields'),
+            'variant' => 'success',
+        ],
+        'confirmFunction' => 'migrateMetafieldsToNewestTemplate',
+    ]);
+} else {
+    echo $this->Bootstrap->node('h1', [], $title);
+    echo $bodyHtml;
+    echo $this->Bootstrap->button([
+        'text' => __('Migrate meta-fields'),
+        'variant' => 'success',
+        'onclick' => '$(".hidden-form-container form").submit()',
+    ]);
+}
+?>
+
+<script>
+    function migrateMetafieldsToNewestTemplate(modalObject, tmpApi) {
+        const $form = modalObject.$modal.find('form')
+        return tmpApi.postForm($form[0]).catch((errors) => {
+            const formHelper = new FormValidationHelper($form[0])
+            const errorHTMLNode = formHelper.buildValidationMessageNode(errors, true)
+            modalObject.$modal.find('div.form-error-container').append(errorHTMLNode)
+            return errors
+        })
+    }
+</script>

templates/MetaTemplates/update.php

@@ -18,6 +18,11 @@ if ($updateStatus['up-to-date']) {
             'html' => __('This meta-template can be updated to version {0} (current: {1}).', sprintf('<strong>%s</strong>', h($templateOnDisk['version'])), h($metaTemplate->version)),
             'dismissible' => false,
         ]);
+        $bodyHtml .= $this->Bootstrap->alert([
+            'variant' => 'success',
+            'text' => __('All meta-fields will be migrated to the newest version.'),
+            'dismissible' => false,
+        ]);
         $form = $this->element('genericElements/Form/genericForm', [
             'entity' => null,
             'ajax' => false,
@@ -28,9 +33,9 @@ if ($updateStatus['up-to-date']) {
                     [
                         'field' => 'update_strategy',
                         'type' => 'checkbox',
-                        'value' => MetaTemplatesTable::UPDATE_STRATEGY_CREATE_NEW,
+                        'value' => MetaTemplatesTable::UPDATE_STRATEGY_UPDATE_EXISTING,
                         'checked' => true,
-                    ]
+                    ],
                 ],
                 'submit' => [
                     'action' => $this->request->getParam('action')
@@ -42,7 +47,7 @@ if ($updateStatus['up-to-date']) {
         $modalSize = 'xl';
         $bodyHtml .= $this->Bootstrap->alert([
             'variant' => 'warning',
-            'text' => __('Updating to version {0} cannot be done automatically as it introduces some conflicts.', h($templateOnDisk['version'])),
+            'html' => __('Updating to version {0} cannot be done automatically as it introduces some conflicts.', sprintf('<strong>%s</strong>', h($templateOnDisk['version']))),
             'dismissible' => false,
         ]);
         $conflictTable = $this->element('MetaTemplates/conflictTable', [
@@ -50,8 +55,11 @@ if ($updateStatus['up-to-date']) {
             'metaTemplate' => $metaTemplate,
             'templateOnDisk' => $templateOnDisk,
         ]);
+        $conflictCount = array_reduce($templateStatus['conflicts'], function ($carry, $conflict) {
+            return $carry + count($conflict['conflictingEntities']);
+        }, 0);
         $bodyHtml .= $this->Bootstrap->collapse([
-            'text' => __('View conflicts'),
+            'text' => __('View conflicts ({0})', $conflictCount),
             'open' => false
         ], $conflictTable);
         $bodyHtml .= $this->element('MetaTemplates/conflictResolution', [

templates/MetaTemplates/update_all.php

@@ -40,12 +40,19 @@ foreach ($templatesUpdateStatus as $uuid => $status) {
     if (!empty($status['new'])) {
         $tableHtml .= sprintf('<td>%s</td>', __('N/A'));
     } else {
-        $tableHtml .= sprintf(
-            '<td>%s %s %s</td>',
-            h($status['current_version']),
-            $this->Bootstrap->icon('arrow-right', ['class' => 'fs-8']),
-            h($status['next_version'])
-        );
+        if ($status['current_version'] == $status['next_version']) {
+            $tableHtml .= sprintf(
+                '<td>%s</td>',
+                h($status['current_version'])
+            );
+        } else {
+            $tableHtml .= sprintf(
+                '<td>%s %s %s</td>',
+                h($status['current_version']),
+                $this->Bootstrap->icon('arrow-right', ['class' => 'fs-8']),
+                h($status['next_version'])
+            );
+        }
     }
     if (!empty($status['new'])) {
         $numberOfUpdates += 1;
@@ -60,6 +67,8 @@ foreach ($templatesUpdateStatus as $uuid => $status) {
     }
     if (!empty($status['new'])) {
         $tableHtml .= sprintf('<td>%s</td>', __('N/A'));
+    } elseif (!empty($status['up-to-date'])) {
+        $tableHtml .= sprintf('<td>%s</td>', __('N/A'));
     } else {
         $tableHtml .= sprintf('<td>%s</td>', !empty($status['conflicts']) ? $this->Bootstrap->icon('check') : $this->Bootstrap->icon('times'));
     }

templates/element/MetaTemplates/conflictResolution.php

@@ -1,9 +1,10 @@
 <?php
 $create_new_allowed = true;
-$keep_all_allowed = false;
+$update_allowed = true;
 $delete_all_allowed = false;
-$totalAllowed = $create_new_allowed + $keep_all_allowed + $delete_all_allowed;
-$maxWidth = 99 - ($create_new_allowed ? 33 : 0) - ($keep_all_allowed ? 33 : 0) - ($delete_all_allowed ? 33 : 0);
+$totalAllowed = $create_new_allowed + $update_allowed + $delete_all_allowed;
+$maxWidth = 99 - ($create_new_allowed ? 33 : 0) - ($update_allowed ? 33 : 0) - ($delete_all_allowed ? 33 : 0);
+$defaultStrategy = 'update_existing';
 
 $form = $this->element('genericElements/Form/genericForm', [
     'entity' => null,
@@ -17,7 +18,7 @@ $form = $this->element('genericElements/Form/genericForm', [
                 'type' => 'radio',
                 'options' => [
                     ['value' => 'create_new', 'text' => 'create_new', 'id' => 'radio_create_new'],
-                    ['value' => 'keep_both', 'text' => 'keep_both', 'id' => 'radio_keep_both'],
+                    ['value' => 'update_existing', 'text' => 'update', 'id' => 'radio_update'],
                     ['value' => 'delete', 'text' => 'delete', 'id' => 'radio_delete'],
                 ],
             ]
@@ -33,10 +34,13 @@ $form = $this->element('genericElements/Form/genericForm', [
     <div class="mt-3 d-flex justify-content-center">
         <div class="btn-group justify-content-center" role="group" aria-label="Basic radio toggle button group">
             <?php if ($create_new_allowed) : ?>
-                <input type="radio" class="btn-check" name="btnradio" id="btnradio1" autocomplete="off" value="create_new" checked>
-                <label class="btn btn-outline-primary mw-<?= $maxWidth ?>" for="btnradio1">
+                <input type="radio" class="btn-check" name="btnradio" id="btnradio1" autocomplete="off" value="create_new" <?= $defaultStrategy == 'create_new' ? 'checked' : '' ?>>
+                <label class="btn btn-outline-warning mw-<?= $maxWidth ?>" for="btnradio1">
                     <div>
-                        <h5 class="mb-3"><?= __('Create new template') ?></h5>
+                        <h5 class="mb-3">
+                            <?= $defaultStrategy == 'create_new' ? $this->Bootstrap->badge(['text' => 'recommended', 'variant' => 'success', 'class' => ['mb-3', 'fs-8']]) : '' ?>
+                            <?= __('Create new template') ?>
+                        </h5>
                         <ul class="text-start fs-7">
                             <li><?= __('A new meta-template will be created and made default.') ?></li>
                             <li><?= __('The old meta-template will remain untouched.') ?></li>
@@ -46,14 +50,17 @@ $form = $this->element('genericElements/Form/genericForm', [
                 </label>
             <?php endif; ?>
 
-            <?php if ($keep_all_allowed) : ?>
-                <input type="radio" class="btn-check" name="btnradio" id="btnradio2" autocomplete="off" value="keep_both">
-                <label class="btn btn-outline-warning mw-<?= $maxWidth ?>" for="btnradio2">
+            <?php if ($update_allowed) : ?>
+                <input type="radio" class="btn-check" name="btnradio" id="btnradio2" autocomplete="off" value="update_existing" <?= $defaultStrategy == 'update_existing' ? 'checked' : '' ?>>
+                <label class="btn btn-outline-primary mw-<?= $maxWidth ?>" for="btnradio2">
                     <div>
-                        <h5 class="mb-3"><?= __('Update non-conflicting') ?></h5>
+                        <div><?= $defaultStrategy == 'update_existing' ? $this->Bootstrap->badge(['text' => 'recommended', 'variant' => 'success', 'class' => ['mb-3']]) : '' ?></div>
+                        <h5 class="mb-3">
+                            <?= __('Update non-conflicting') ?>
+                        </h5>
                         <ul class="text-start fs-7">
-                            <li><?= __('Meta-fields not having conflicts will be migrated to the new  meta-template.') ?></li>
-                            <li><?= __('Meta-fields having a conflicts will stay on their current meta-template.') ?></li>
+                            <li><?= __('Entities not having conflicts will have their meta-fields migrated to the new meta-template.') ?></li>
+                            <li><?= __('Entities having a conflicts will stay on their current meta-template.') ?></li>
                             <li><?= __('Conflicts can be taken care of manually via the UI.') ?></li>
                         </ul>
                     </div>
@@ -61,10 +68,13 @@ $form = $this->element('genericElements/Form/genericForm', [
             <?php endif; ?>
 
             <?php if ($delete_all_allowed) : ?>
-                <input type="radio" class="btn-check" name="btnradio" id="btnradio3" autocomplete="off" value="delete">
+                <input type="radio" class="btn-check" name="btnradio" id="btnradio3" autocomplete="off" value="delete" <?= $defaultStrategy == 'delete' ? 'checked' : '' ?>>
                 <label class="btn btn-outline-danger mw-<?= $maxWidth ?>" for="btnradio3">
                     <div>
-                        <h5 class="mb-3"><?= __('Delete conflicting fields') ?></h5>
+                        <h5 class="mb-3">
+                            <?= $defaultStrategy == 'delete' ? $this->Bootstrap->badge(['text' => 'recommended', 'variant' => 'success', 'class' => ['mb-3', 'fs-8']]) : '' ?>
+                            <?= __('Delete conflicting fields') ?>
+                        </h5>
                         <ul class="text-start fs-7">
                             <li><?= __('Meta-fields not satisfying the new meta-template definition will be deleted.') ?></li>
                             <li><?= __('All other meta-fields will be upgraded to the new meta-template.') ?></li>
@@ -84,18 +94,18 @@ $form = $this->element('genericElements/Form/genericForm', [
     (function() {
         const $form = $('.conflict-resolution-form-container form')
         const $create = $form.find('input#radio_create_new')
-        const $keep = $form.find('input#radio_keep_both')
+        const $keep = $form.find('input#radio_update')
         const $delete = $form.find('input#radio_delete')
 
         $(document).ready(function() {
             $('.conflict-resolution-picker').find('input[type="radio"]').change(function() {
                 updateSelected($(this).val())
             })
-            updateSelected('create_new')
+            updateSelected('<?= $defaultStrategy ?>')
         })
 
         function updateSelected(choice) {
-            if (choice == 'keep_both') {
+            if (choice == 'update_existing') {
                 $keep.prop('checked', true)
             } else if (choice == 'delete') {
                 $delete.prop('checked', true)

templates/element/MetaTemplates/conflictTable.php

@@ -21,7 +21,7 @@ use Cake\Routing\Router;
                     </td>
                     <td>
                         <?php
-                        foreach ($fieldConflict['conflictingEntities'] as $i => $id) {
+                        foreach ($fieldConflict['conflictingEntities'] as $i => $metaEntity) {
                             if ($i > 0) {
                                 echo ', ';
                             }
@@ -32,9 +32,9 @@ use Cake\Routing\Router;
                             $url = Router::url([
                                 'controller' => Inflector::pluralize($templateStatus['existing_template']->scope),
                                 'action' => 'view',
-                                $id
+                                $metaEntity['parent_id']
                             ]);
-                            echo sprintf('<a href="%s" target="_blank">%s</a>', $url, __('{0} #{1}', h(Inflector::humanize($templateStatus['existing_template']->scope)),  h($id)));
+                            echo sprintf('<a href="%s" target="_blank">%s</a>', $url, __('{0} #{1}', h(Inflector::humanize($templateStatus['existing_template']->scope)),  h($metaEntity['parent_id'])));
                         }
                         ?>
                     </td>