Support exporting entity reference revisions

After using this for a good while without problems, I run into a problem with revisions. I am adding an updated patch with some code from \Drupal\entity_reference_revisions\Plugin\Field\FieldFormatter\EntityReferenceRevisionsFormatterBase::prepareView()

I haven't touched this module in a while, and am currently trying to relearn the structure.

I see there is already rest_views_revisions submodule with an entity_reference_revisions_export field formatter that its PHPdoc comment claims "exports the rendered entity" of an entity_reference_revisions field.

Does that one not fulfil the functionality needed here? As far as I can tell, the inheritance chain here is:

- core EntityReferenceFormatterBase (ERFB) is the base class for entity reference formatters.
- core EntityReferenceEntityFormatter (EREF) extends ERFB and is the base class for displaying entity reference as rendered entity.
- rest_views EntityReferenceExportFormatter (ERXF) extends EREF.
- entity_reference_revisions EntityReferenceRevisionsEntityFormatter (ERREF) extends EREF.
- rest_views_revisions EntityReferenceRevisionsExportFormatter (ERRXF) extends ERXF, *and* simultaneously wraps an instance of ERREF, as an adapter. It does this to delegate the ::prepareView() call to entity_reference_revisions' ERREF (similar to what this patch copy-pastes into the main ERXF), while allowing its actual parent ERXF to handle the ::view() call.

@cburschka I think what you're saying is right - the sub-module should cover entity reference revisions, however in my case, on the export nothing is printing for this type of entity. I'm not sure if it's best to create a new issue for it?

I am moving support to version 3, can you please confirm if this issue still exists in version 3.
If it does still exist please change the version dropdown to 3.0.x and set the status to Needs Work.

There is a submodule in version 3 for this that should cover your use case.

Thank you!

I've confirmed that paragraphs work in version 3. Please reopen this if you experience this on the latest version.