identifiers: relax deduplication rules on Identifiers

CHANGES.rst

@@ -10,6 +10,10 @@
 Changes
 =======
 
+Version 0.10.0 (released 2024-11-11)
+
+- add IdentifierValueSet to require scheme and value to be unique
+
 Version v0.9.3 (released 2024-11-05)
 
 - setup: upgrade babel-edtf to 1.2.0 and edtf to 5.0.0 and fix bug with dates and times with hour 23

marshmallow_utils/__init__.py

@@ -44,6 +44,6 @@
   `arrow <https://pypi.org/project/arrow/>`_ for date parsing.
 """
 
-__version__ = "0.9.3"
+__version__ = "0.10.0"
 
 __all__ = ("__version__",)

marshmallow_utils/fields/__init__.py

@@ -17,7 +17,7 @@
 from .contrib import Function, Method
 from .edtfdatestring import EDTFDateString, EDTFDateTimeString
 from .generated import GenFunction, GenMethod
-from .identifier import IdentifierSet
+from .identifier import IdentifierSet, IdentifierValueSet
 from .isodate import ISODateString
 from .isolanguage import ISOLangString
 from .links import Link, Links
@@ -43,6 +43,7 @@
     "GenFunction",
     "GenMethod",
     "IdentifierSet",
+    "IdentifierValueSet",
     "ISODateString",
     "ISOLangString",
     "Link",

marshmallow_utils/fields/identifier.py

@@ -23,5 +23,24 @@ class IdentifierSet(List):
     def _validate(self, value):
         """Validates the list of identifiers."""
         schemes = [identifier["scheme"] for identifier in value]
-        if not len(value) == len(set(schemes)):
+        if len(value) != len(set(schemes)):
+            raise self.make_error(key="multiple_values")
+
+
+class IdentifierValueSet(List):
+    """Identifier list with deduplication.
+
+    It assumes the items of the list contain a *scheme* property.
+    """
+
+    default_error_messages = {
+        "multiple_values": "Duplicated identifier entry is not allowed.",
+    }
+
+    def _validate(self, value):
+        """Validates the list of identifiers."""
+        identifiers = [
+            (identifier["scheme"], identifier["identifier"]) for identifier in value
+        ]
+        if len(value) != len(set(identifiers)):
             raise self.make_error(key="multiple_values")