Sonata\Exporter\Handler uses deprecated interface SourceIteratorInterface

[jderusse]

Environment

Sonata packages

show

$ composer show --latest 'sonata-project/*'
Color legend:
- patch or minor release available - update recommended
- major release available - update possible
- up to date version
sonata-project/admin-bundle              4.2.1  4.2.2  The missing Symfony Admin Generator
sonata-project/block-bundle              4.8.0  4.8.0  Symfony SonataBlockBundle
sonata-project/cache                     2.2.0  2.2.0  Cache library
sonata-project/datagrid-bundle           3.4.2  3.4.2  Symfony SonataDatagridBundle
sonata-project/doctrine-extensions       1.15.0 1.15.0 Doctrine2 behavioral extensions
sonata-project/doctrine-orm-admin-bundle 4.1.0  4.1.0  Integrate Doctrine ORM into the SonataAdminBundle
sonata-project/exporter                  2.9.0  2.9.1  Lightweight Exporter library
sonata-project/form-extensions           1.12.1 1.12.1 Symfony form extensions
sonata-project/twig-extensions           1.9.0  1.9.0  Sonata twig extensions

Subject

In #532 the SourceIteratorInterface interface has been deprecated, but the class Sonata\Exporter\Handler still expect an instance of SourceIteratorInterface.

So we don't have any way to fix the deprecation.

[VincentLanglet]

Do you want to make the PR @jderusse ?
SourceIteratorInterface is deprecated in favor of \Iterator, so changing the typehint to \Iterator would solve the issue.