Don't normalize fields typed with Any

doc/changelog.rst

@@ -13,6 +13,7 @@ Fixed
 ^^^^^
 - When using ``model_dump``, ignore invalid ``attributes`` and ``excluded_attributes``
   as suggested by RFC7644.
+- Don't normalize attributes typed with :data:`Any`. :issue:`20`
 
 [0.3.7] - 2025-07-17
 --------------------

scim2_models/base.py

@@ -23,11 +23,11 @@
 from scim2_models.annotations import Required
 from scim2_models.annotations import Returned
 from scim2_models.context import Context
+from scim2_models.utils import UNION_TYPES
+from scim2_models.utils import find_field_name
 from scim2_models.utils import normalize_attribute_name
 from scim2_models.utils import to_camel
 
-from .utils import UNION_TYPES
-
 
 def contains_attribute_or_subattributes(
     attribute_urns: list[str], attribute_urn: str
@@ -152,15 +152,44 @@ def normalize_attribute_names(
         transformed in lowercase so any case is handled the same way.
         """
 
-        def normalize_value(value: Any) -> Any:
-            if isinstance(value, dict):
-                return {
-                    normalize_attribute_name(k): normalize_value(v)
-                    for k, v in value.items()
-                }
-            return value
+        def normalize_dict_keys(
+            input_dict: dict, model_class: type["BaseModel"]
+        ) -> dict:
+            """Normalize dictionary keys, preserving case for Any fields."""
+            result = {}
+
+            for key, val in input_dict.items():
+                field_name = find_field_name(model_class, key)
+                field_type = (
+                    model_class.get_field_root_type(field_name) if field_name else None
+                )
+
+                # Don't normalize keys for attributes typed with Any
+                # This way, agnostic dicts such as PatchOp.operations.value
+                # are preserved
+                if field_name and field_type == Any:
+                    result[key] = normalize_value(val)
+                else:
+                    result[normalize_attribute_name(key)] = normalize_value(
+                        val, field_type
+                    )
+
+            return result
+
+        def normalize_value(
+            val: Any, model_class: Optional[type["BaseModel"]] = None
+        ) -> Any:
+            """Normalize input value based on model class."""
+            if not isinstance(val, dict):
+                return val
+
+            # If no model_class, preserve original keys
+            if not model_class:
+                return {k: normalize_value(v) for k, v in val.items()}
+
+            return normalize_dict_keys(val, model_class)
 
-        normalized_value = normalize_value(value)
+        normalized_value = normalize_value(value, cls)
         obj = handler(normalized_value)
         assert isinstance(obj, cls)
         return obj

tests/test_model_attributes.py

@@ -13,6 +13,7 @@
 from scim2_models.rfc7643.resource import Resource
 from scim2_models.rfc7643.user import User
 from scim2_models.rfc7644.error import Error
+from scim2_models.rfc7644.patch_op import PatchOp
 from scim2_models.urn import validate_attribute_urn
 
 
@@ -303,3 +304,47 @@ def test_scim_object_model_dump_coverage():
     # Test model_dump_json coverage
     json_result = error.model_dump_json(scim_ctx=None)
     assert isinstance(json_result, str)
+
+
+def test_patch_op_preserves_case_in_value_fields():
+    """Test that PatchOp preserves original case in operation values."""
+    # Test data from the GitHub issue
+    patch_data = {
+        "schemas": ["urn:ietf:params:scim:api:messages:2.0:PatchOp"],
+        "Operations": [
+            {
+                "op": "replace",
+                "value": {
+                    "streetAddress": "911 Universal City Plaza",
+                },
+            }
+        ],
+    }
+
+    patch_op = PatchOp[User].model_validate(patch_data)
+    result = patch_op.model_dump()
+
+    value = result["Operations"][0]["value"]
+    assert value["streetAddress"] == "911 Universal City Plaza"
+
+
+def test_patch_op_preserves_case_in_sub_value_fields():
+    """Test that nested objects within Any fields are still normalized according to their schema."""
+    patch_data = {
+        "schemas": ["urn:ietf:params:scim:api:messages:2.0:PatchOp"],
+        "Operations": [
+            {
+                "op": "replace",
+                "value": {
+                    "name": {"givenName": "John"},
+                },
+            }
+        ],
+    }
+
+    patch_op = PatchOp[User].model_validate(patch_data)
+    result = patch_op.model_dump()
+
+    value = result["Operations"][0]["value"]
+
+    assert value["name"]["givenName"] == "John"