code: protected function loadMetaModel($nameOrId)
      {
          if (is_numeric($nameOrId)) {
              // ID.
              $tableName = $this->getServiceContainer()->getFactory()->translateIdToMetaModelName($nameOrId);
          } elseif (is_string($nameOrId)) {
              // Name.
              $tableName = $nameOrId;
          }
  
          if (isset($tableName)) {
              return $this->getServiceContainer()->getFactory()->getMetaModel($tableName);
          }
  
          // Unknown.
          return null;
      }
docs: Try to load the MetaModel by id or name.
  
  @param mixed $nameOrId Name or id of the MetaModel.
  
  @return IMetaModel|null