code: public function addFilterConstraint(ClassMetadata $targetEntity, $targetTableAlias)
      {
          if (!$targetEntity->reflClass->implementsInterface(Tenantable::class)) {
              return '';
          }
  
          $tenant = trim($this->getParameter('tenant'), '\'');
  
          if ('' === $tenant) {
              $constraint = sprintf('%s.tenant is NULL', $targetTableAlias);
          } else {
              $constraint = sprintf('%s.tenant = \'%s\'', $targetTableAlias, $tenant);
          }
  
          return $constraint;
      }
docs: Add a tenant sql condition if the entity is tenantable
  
  @param \Doctrine\ORM\Mapping\ClassMetadata $targetEntity
  @param string $targetTableAlias
  @return string