errors: introduce an error for drafts not found when publish record e…

…xists

* closes inveniosoftware/invenio-app-rdm#2694

invenio_drafts_resources/resources/records/errors.py

@@ -12,6 +12,7 @@
 import json
 
 from flask_resources.errors import HTTPJSONException
+from invenio_pidstore.errors import PIDDoesNotExistError
 
 
 class RedirectException(HTTPJSONException):
@@ -42,3 +43,7 @@ def get_body(self, environ=None, scope=None):
             "location": self.location,
         }
         return json.dumps(body)
+
+
+class DraftNotCreatedError(PIDDoesNotExistError):
+    """Draft is not created for published record error."""

invenio_drafts_resources/services/records/service.py

@@ -27,6 +27,7 @@
 from sqlalchemy.orm.exc import NoResultFound
 from werkzeug.local import LocalProxy
 
+from ...resources.records.errors import DraftNotCreatedError
 from .uow import ParentRecordCommitOp
 
 
@@ -205,7 +206,7 @@ def read_draft(self, identity, id_, expand=False):
             # with object id exists for the published record, but object
             # getter fails to get the draft object because only the record
             # object exists).
-            raise PIDDoesNotExistError(self.draft_cls.pid.field._pid_type, id_)
+            raise DraftNotCreatedError(self.draft_cls.pid.field._pid_type, id_)
 
         self.require_permission(identity, "read_draft", record=draft)