feat!: oneOf Union variants use Title names instead of indices

Changed behavior from using the term `x_type_0` to `x_type_y` if x is a Schema that defines a Title property string `y`.

This provides an easier interface for understanding what users are importing, as well as less reliance on the ordering of the schema.

BREAKING CHANGE: The name of imports will change if the Schema they were built on previously used Title properties on fields within a oneOf Union.

openapi_python_client/parser/properties/union.py

@@ -28,7 +28,14 @@ class UnionProperty(PropertyProtocol):
 
     @classmethod
     def build(
-        cls, *, data: oai.Schema, name: str, required: bool, schemas: Schemas, parent_name: str, config: Config
+        cls,
+        *,
+        data: oai.Schema,
+        name: str,
+        required: bool,
+        schemas: Schemas,
+        parent_name: str,
+        config: Config,
     ) -> tuple[UnionProperty | PropertyError, Schemas]:
         """
         Create a `UnionProperty` the right way.
@@ -55,16 +62,25 @@ def build(
                 type_list_data.append(data.model_copy(update={"type": _type, "default": None}))
 
         for i, sub_prop_data in enumerate(chain(data.anyOf, data.oneOf, type_list_data)):
+            # If a schema has a title property, we can use that to carry forward a descriptive instead of "type_0"
+            subscript: int | str = i
+            is_oneOf = i >= len(data.anyOf) and i < (len(data.anyOf) + len(data.oneOf))
+            if isinstance(sub_prop_data, oai.Schema) and sub_prop_data.title is not None and is_oneOf:
+                subscript = sub_prop_data.title
+
             sub_prop, schemas = property_from_data(
-                name=f"{name}_type_{i}",
+                name=f"{name}_type_{subscript}",
                 required=True,
                 data=sub_prop_data,
                 schemas=schemas,
                 parent_name=parent_name,
                 config=config,
             )
             if isinstance(sub_prop, PropertyError):
-                return PropertyError(detail=f"Invalid property in union {name}", data=sub_prop_data), schemas
+                return (
+                    PropertyError(detail=f"Invalid property in union {name}", data=sub_prop_data),
+                    schemas,
+                )
             sub_properties.append(sub_prop)
 
         prop = UnionProperty(
@@ -97,7 +113,12 @@ def convert_value(self, value: Any) -> Value | None | PropertyError:
 
     def _get_inner_type_strings(self, json: bool, multipart: bool) -> set[str]:
         return {
-            p.get_type_string(no_optional=True, json=json, multipart=multipart, quoted=not p.is_base_type)
+            p.get_type_string(
+                no_optional=True,
+                json=json,
+                multipart=multipart,
+                quoted=not p.is_base_type,
+            )
             for p in self.inner_properties
         }
 

tests/conftest.py

@@ -3,7 +3,7 @@
 
 import pytest
 
-from openapi_python_client import Config, MetaType
+from openapi_python_client import Config, MetaType, utils
 from openapi_python_client import schema as oai
 from openapi_python_client.config import ConfigFile
 from openapi_python_client.parser.properties import (
@@ -267,5 +267,5 @@ def _common_kwargs(kwargs: Dict[str, Any]) -> Dict[str, Any]:
         **kwargs,
     }
     if not kwargs.get("python_name"):
-        kwargs["python_name"] = kwargs["name"]
+        kwargs["python_name"] = utils.PythonIdentifier(value=kwargs["name"], prefix="")
     return kwargs

tests/test_parser/test_properties/test_init.py

@@ -423,7 +423,7 @@ def test_property_from_data_str_enum_with_null(
         # None / null is removed from enum, and property is now nullable
         assert isinstance(prop, UnionProperty), "Enums with None should be converted to UnionProperties"
         enum_prop = enum_property_factory(
-            name="my_enum_type_1",
+            name="my_enum_type_AnEnum",
             required=required,
             values={"A": "A", "B": "B", "C": "C"},
             class_info=Class(name="ParentAnEnum", module_name="parent_an_enum"),

tests/test_parser/test_properties/test_union.py

@@ -81,3 +81,51 @@ def test_not_required_in_path(config):
 
     err = prop.validate_location(ParameterLocation.PATH)
     assert isinstance(err, ParseError)
+
+
+def test_union_oneOf_descriptive_type_name(
+    union_property_factory, date_time_property_factory, string_property_factory, config
+):
+    from openapi_python_client.parser.properties import Schemas, property_from_data
+
+    nested_schema_variant_A = oai.Schema(type=DataType.STRING, title="A")
+    nested_schema_variant_B = oai.Schema(type=DataType.STRING, title="B")
+    nested_schema_variant_2 = oai.Schema(type=DataType.STRING)
+    nested_schema_variant_C = oai.Schema(type=DataType.STRING, title="C")
+    nested_schema_variant_4 = oai.Schema(type=DataType.STRING)
+
+    name = "union_prop"
+    required = True
+    data = oai.Schema(
+        anyOf=[
+            # AnyOf retains the old naming convention
+            nested_schema_variant_C,
+            nested_schema_variant_4,
+        ],
+        oneOf=[
+            # OneOf fields that define their own titles will have those titles as their Type names
+            nested_schema_variant_A,
+            nested_schema_variant_B,
+            nested_schema_variant_2,
+            oai.Schema(type=DataType.STRING, schema_format="date-time"),
+        ],
+    )
+    expected = union_property_factory(
+        name=name,
+        required=required,
+        inner_properties=[
+            string_property_factory(name=f"{name}_type_0"),
+            string_property_factory(name=f"{name}_type_1"),
+            string_property_factory(name=f"{name}_type_A"),
+            string_property_factory(name=f"{name}_type_B"),
+            string_property_factory(name=f"{name}_type_4"),
+            date_time_property_factory(name=f"{name}_type_5"),
+        ],
+    )
+
+    p, s = property_from_data(
+        name=name, required=required, data=data, schemas=Schemas(), parent_name="parent", config=config
+    )
+
+    assert p == expected
+    assert s == Schemas()