Record: Improve handling of draft classes in RecordCommunitiesService

* Records: catch PIDUnregistered error
* Add draft class to RecordCommunitiesService
* Closes inveniosoftware/invenio-app-rdm#2857

Author: Samk13

invenio_rdm_records/services/communities/service.py

@@ -1,7 +1,8 @@
 # -*- coding: utf-8 -*-
 #
 # Copyright (C) 2023-2024 CERN.
-# Copyright (C) 2024 Graz University of Technology.
+# Copyright (C) 2024      Graz University of Technology.
+# Copyright (C) 2024      KTH Royal Institute of Technology.
 #
 # Invenio-RDM-Records is free software; you can redistribute it and/or modify
 # it under the terms of the MIT License; see LICENSE file for more details.
@@ -17,7 +18,7 @@
 )
 from invenio_i18n import lazy_gettext as _
 from invenio_notifications.services.uow import NotificationOp
-from invenio_pidstore.errors import PIDDoesNotExistError
+from invenio_pidstore.errors import PIDDoesNotExistError, PIDUnregistered
 from invenio_records_resources.services import (
     RecordIndexerMixin,
     Service,
@@ -67,6 +68,11 @@ def record_cls(self):
         """Factory for creating a record class."""
         return self.config.record_cls
 
+    @property
+    def draft_cls(self):
+        """Factory for creating a draft class."""
+        return self.config.draft_cls
+
     def _exists(self, community_id, record):
         """Return the request id if an open request already exists, else None."""
         results = current_requests_service.search(
@@ -264,7 +270,10 @@ def search(
         **kwargs,
     ):
         """Search for record's communities."""
-        record = self.record_cls.pid.resolve(id_)
+        try:
+            record = self.record_cls.pid.resolve(id_)
+        except PIDUnregistered:
+            record = self.draft_cls.pid.resolve(id_, registered_only=False)
         self.require_permission(identity, "read", record=record)
 
         communities_ids = record.parent.communities.ids

invenio_rdm_records/services/config.py

@@ -4,7 +4,8 @@
 # Copyright (C) 2020-2021 Northwestern University.
 # Copyright (C)      2021 TU Wien.
 # Copyright (C) 2021-2023 Graz University of Technology.
-# Copyright (C) 2022 Universität Hamburg
+# Copyright (C) 2022      Universität Hamburg
+# Copyright (C) 2024      KTH Royal Institute of Technology.
 #
 # Invenio-RDM-Records is free software; you can redistribute it and/or modify
 # it under the terms of the MIT License; see LICENSE file for more details.
@@ -260,6 +261,7 @@ class RDMRecordCommunitiesConfig(ServiceConfig, ConfiguratorMixin):
     service_id = "record-communities"
 
     record_cls = FromConfig("RDM_RECORD_CLS", default=RDMRecord)
+    draft_cls = FromConfig("RDM_DRAFT_CLS", default=RDMDraft)
     permission_policy_cls = FromConfig(
         "RDM_PERMISSION_POLICY", default=RDMRecordPermissionPolicy, import_string=True
     )