/**
  * {@inheritdoc}
  */
 public function preUpdate()
 {
     $entityConfigs = $this->extendConfigProvider->getConfigs();
     foreach ($entityConfigs as $entityConfig) {
         if (!$entityConfig->is('is_extend')) {
             continue;
         }
         $fieldConfigs = $this->extendConfigProvider->getConfigs($entityConfig->getId()->getClassName());
         foreach ($fieldConfigs as $fieldConfig) {
             if (!$fieldConfig->is('state', ExtendScope::STATE_NEW)) {
                 continue;
             }
             // @todo: we need to find a way to use this extension to process OWNER_SYSTEM relations as well
             // currently we have several problems here:
             // - collision with associations
             // - no support unidirectional relations
             if (!$fieldConfig->is('owner', ExtendScope::OWNER_CUSTOM)) {
                 continue;
             }
             /** @var FieldConfigId $fieldConfigId */
             $fieldConfigId = $fieldConfig->getId();
             if (in_array($fieldConfigId->getFieldType(), RelationType::$anyToAnyRelations)) {
                 $this->createRelation($fieldConfig);
             }
         }
     }
 }