jambo/parser/const_type_parser.py

@@ -9,6 +9,11 @@ from typing_extensions import Annotated, Any, Unpack
 class ConstTypeParser(GenericTypeParser):
     json_schema_type = "const"
 
+    default_mappings = {
+        "const": "default",
+        "description": "description",
+    }
+
     def from_properties_impl(
         self, name, properties, **kwargs: Unpack[TypeParserOptions]
     ):
@@ -23,10 +28,7 @@ class ConstTypeParser(GenericTypeParser):
             )
 
         const_type = self._build_const_type(const_value)
-        parsed_properties = {
+        parsed_properties = self.mappings_properties_builder(properties, **kwargs)
-            "default": const_value,
-            "description": properties.get("description"),
-        }
 
         return const_type, parsed_properties
 
@@ -38,9 +40,4 @@ class ConstTypeParser(GenericTypeParser):
                 )
             return value
 
-        return Annotated[
+        return Annotated[type(const_value), AfterValidator(_validate_const_value)]
-            type(const_value),
-            AfterValidator(
-                _validate_const_value
-            )
-        ]

jambo/parser/object_type_parser.py

@@ -1,7 +1,7 @@
 from jambo.parser._type_parser import GenericTypeParser
 from jambo.types.type_parser_options import TypeParserOptions
 
-from pydantic import BaseModel, Field, create_model
+from pydantic import BaseModel, ConfigDict, Field, create_model
 from typing_extensions import Any, Unpack
 
 
@@ -43,8 +43,10 @@ class ObjectTypeParser(GenericTypeParser):
         :param required_keys: List of required keys in the schema.
         :return: A Pydantic model class.
         """
+        model_config = ConfigDict(validate_assignment=True)
         fields = cls._parse_properties(schema, required_keys, **kwargs)
-        return create_model(name, **fields)
+
+        return create_model(name, __config__=model_config, **fields)
 
     @classmethod
     def _parse_properties(

tests/parser/test_const_type_parser.py

@@ -1,23 +1,49 @@
-from typing_extensions import Annotated, get_args, get_origin
-from webbrowser import get
 from jambo.parser import ConstTypeParser
 
+from typing_extensions import Annotated, get_args, get_origin
+
 from unittest import TestCase
 
 
 class TestConstTypeParser(TestCase):
-    def test_parse_const_type(self):
+    def test_const_type_parser(self):
         parser = ConstTypeParser()
 
         expected_const_value = "United States of America"
-        properties = {
+        properties = {"const": expected_const_value}
-            "const": expected_const_value
-        }
 
-        parsed_type, parsed_properties = parser.from_properties(
+        parsed_type, parsed_properties = parser.from_properties_impl(
             "country", properties
         )
 
         self.assertEqual(get_origin(parsed_type), Annotated)
-
         self.assertIn(str, get_args(parsed_type))
+
+        self.assertEqual(parsed_properties["default"], expected_const_value)
+
+    def test_const_type_parser_invalid_properties(self):
+        parser = ConstTypeParser()
+
+        expected_const_value = "United States of America"
+        properties = {"notConst": expected_const_value}
+
+        with self.assertRaises(ValueError) as context:
+            parser.from_properties_impl("invalid_country", properties)
+
+        self.assertIn(
+            "Const type invalid_country must have 'const' property defined",
+            str(context.exception),
+        )
+
+    def test_const_type_parser_invalid_const_value(self):
+        parser = ConstTypeParser()
+
+        properties = {"const": {}}
+
+        with self.assertRaises(ValueError) as context:
+            parser.from_properties_impl("invalid_country", properties)
+
+        self.assertIn(
+            "Const type invalid_country must have 'const' value of allowed types",
+            str(context.exception),
+        )

tests/test_schema_converter.py

@@ -634,3 +634,26 @@ class TestSchemaConverter(TestCase):
 
         obj = Model()
         self.assertEqual(obj.status.value, "active")
+
+    def test_const_type_parser(self):
+        schema = {
+            "title": "Country",
+            "type": "object",
+            "properties": {
+                "name": {
+                    "const": "United States of America",
+                }
+            },
+            "required": ["name"],
+        }
+
+        Model = SchemaConverter.build(schema)
+
+        obj = Model()
+        self.assertEqual(obj.name, "United States of America")
+
+        with self.assertRaises(ValueError):
+            obj.name = "Canada"
+
+        with self.assertRaises(ValueError):
+            Model(name="Canada")