fix: remove datacite schema31 support

* it has been removed from inveniosoftware/datacite package too

Author: utnapischtim

invenio_records_rest/serializers/datacite.py

@@ -2,13 +2,14 @@
 #
 # This file is part of Invenio.
 # Copyright (C) 2016-2018 CERN.
+# Copyright (C) 2025 Graz University of Technology.
 #
 # Invenio is free software; you can redistribute it and/or modify it
 # under the terms of the MIT License; see LICENSE file for more details.
 
 """Marshmallow based DataCite serializer for records."""
 
-from datacite import schema31, schema40, schema41
+from datacite import schema40, schema41
 from invenio_records.api import Record
 from lxml import etree
 from lxml.builder import E
@@ -72,19 +73,6 @@ def serialize_oaipmh(self, pid, record):
         return self.schema.dump_etree(obj)
 
 
-class DataCite31Serializer(BaseDataCiteSerializer):
-    """Marshmallow DataCite serializer v3.1 for records.
-
-    Note: This serializer is not suitable for serializing large number of
-    records.
-    """
-
-    schema = schema31
-    """Class variable to define which schema use."""
-    version = "3.1"
-    """Class variable to tell the version of the schema."""
-
-
 class DataCite40Serializer(BaseDataCiteSerializer):
     """Marshmallow DataCite serializer v4.0 for records.
 

tests/test_serializer_datacite.py

@@ -2,6 +2,7 @@
 #
 # This file is part of Invenio.
 # Copyright (C) 2016-2018 CERN.
+# Copyright (C) 2025 Graz University of Technology.
 #
 # Invenio is free software; you can redistribute it and/or modify it
 # under the terms of the MIT License; see LICENSE file for more details.
@@ -15,7 +16,6 @@
 from marshmallow import fields
 
 from invenio_records_rest.serializers.datacite import (
-    DataCite31Serializer,
     DataCite40Serializer,
     DataCite41Serializer,
     OAIDataCiteSerializer,
@@ -35,9 +35,7 @@ class SimpleSchema(Schema):
     identifier = fields.Nested(DOISchema, attribute="metadata")
 
 
-@pytest.mark.parametrize(
-    "serializer", [DataCite31Serializer, DataCite40Serializer, DataCite41Serializer]
-)
+@pytest.mark.parametrize("serializer", [DataCite40Serializer, DataCite41Serializer])
 def test_serialize(serializer):
     pid = PersistentIdentifier(pid_type="recid", pid_value="2")
     record = Record({"doi": "10.1234/foo"})
@@ -55,9 +53,7 @@ def test_serialize(serializer):
     assert len(tree.xpath("/oai_datacite/datacentreSymbol")) == 1
 
 
-@pytest.mark.parametrize(
-    "serializer", [DataCite31Serializer, DataCite40Serializer, DataCite41Serializer]
-)
+@pytest.mark.parametrize("serializer", [DataCite40Serializer, DataCite41Serializer])
 def test_serialize_search(serializer):
     """Test JSON serialize."""