fix: pydantic warnings

PydanticDeprecatedSince211: Accessing this attribute on the instance is deprecated, and will be removed in Pydantic V3. Instead, you should access this attribute from the model class. Deprecated in Pydantic V2.11 to be removed in V3.0.

Author: azmeuk

doc/changelog.rst

@@ -1,6 +1,13 @@
 Changelog
 =========
 
+[0.3.2] - Unreleased
+--------------------
+
+Fixed
+^^^^^
+- Pydantic warning.
+
 [0.3.1] - 2025-03-07
 --------------------
 

scim2_models/base.py

@@ -649,14 +649,14 @@ def mark_with_schema(self):
         """
         from scim2_models.rfc7643.resource import Resource
 
-        for field_name in self.model_fields:
+        for field_name in self.__class__.model_fields:
             attr_type = self.get_field_root_type(field_name)
             if not is_complex_attribute(attr_type):
                 continue
 
             main_schema = (
                 getattr(self, "_schema", None)
-                or self.model_fields["schemas"].default[0]
+                or self.__class__.model_fields["schemas"].default[0]
             )
 
             separator = ":" if isinstance(self, Resource) else "."
@@ -847,8 +847,10 @@ def get_attribute_urn(self, field_name: str) -> str:
 
         See :rfc:`RFC7644 §3.10 <7644#section-3.10>`.
         """
-        main_schema = self.model_fields["schemas"].default[0]
-        alias = self.model_fields[field_name].serialization_alias or field_name
+        main_schema = self.__class__.model_fields["schemas"].default[0]
+        alias = (
+            self.__class__.model_fields[field_name].serialization_alias or field_name
+        )
 
         # if alias contains a ':' this is an extension urn
         full_urn = alias if ":" in alias else f"{main_schema}:{alias}"
@@ -865,7 +867,9 @@ def get_attribute_urn(self, field_name: str) -> str:
 
         See :rfc:`RFC7644 §3.10 <7644#section-3.10>`.
         """
-        alias = self.model_fields[field_name].serialization_alias or field_name
+        alias = (
+            self.__class__.model_fields[field_name].serialization_alias or field_name
+        )
         return f"{self._schema}.{alias}"