adds min lengh in patch

Author: pcrespov

packages/models-library/src/models_library/api_schemas_webserver/users.py

@@ -141,7 +141,7 @@ def from_domain_model(
 class MyProfilePatch(InputSchemaWithoutCamelCase):
     first_name: FirstNameStr | None = None
     last_name: LastNameStr | None = None
-    user_name: Annotated[IDStr | None, Field(alias="userName")] = None
+    user_name: Annotated[IDStr | None, Field(alias="userName", min_length=4)] = None
 
     privacy: MyProfilePrivacyPatch | None = None
 

services/web/server/tests/unit/isolated/test_users_models.py

@@ -18,7 +18,7 @@
 from models_library.generics import Envelope
 from models_library.users import UserThirdPartyToken
 from models_library.utils.fastapi_encoders import jsonable_encoder
-from pydantic import BaseModel
+from pydantic import BaseModel, ValidationError
 from pytest_simcore.pydantic_models import (
     assert_validation_model,
     iter_model_examples_in_class,
@@ -185,3 +185,23 @@ def test_mapping_update_models_from_rest_to_db():
         "name": "foo1234",
         "privacy_hide_fullname": False,
     }
+
+
+def test_my_profile_patch_username_validation():
+    # minimum length username is 4
+    with pytest.raises(ValidationError) as err_info:
+        MyProfilePatch.model_validate({"userName": "abc"})
+
+    assert err_info.value.error_count() == 1
+    assert err_info.value.errors()[0]["type"] == "too_short"
+
+    MyProfilePatch.model_validate({"userName": "abcd"})
+
+    # Ensure valid characters (alphanumeric + . _ -)
+    with pytest.raises(ValidationError, match="start with a letter") as err_info:
+        MyProfilePatch.model_validate({"userName": "1234"})
+
+    assert err_info.value.error_count() == 1
+    assert err_info.value.errors()[0]["type"] == "value_error"
+
+    MyProfilePatch.model_validate({"userName": "u1234"})