check if doi deleted

oarepo_doi/api.py

@@ -66,10 +66,9 @@ def edit_doi(service, record, event=None):
 
     mapping = obj_or_import_string(service.mapping[record.schema])()
     doi_value = mapping.get_doi(record)
-
+    if not check_if_correct_doi(doi_value, record):
+        return
     if doi_value:
-        if not check_if_correct_doi(doi_value, record):
-            return
         errors = mapping.metadata_check(record)
         record_service = get_record_service_for_record(record)
         record["links"] = record_service.links_item_tpl.expand(system_identity, record)
@@ -105,6 +104,10 @@ def edit_doi(service, record, event=None):
 def check_if_correct_doi(value, record):
     try:
         doi = PersistentIdentifier.get_by_object('doi', "rec", record.id) #object has no doi in database == doi was added via created form by user
+        if doi and not value: #doi deleted by user
+            raise ValidationError(
+                message="Datacite doi deleted by the user."
+            )
     except PIDDoesNotExistError as e:
         return False
     try: