add discriminator property support

end_to_end_tests/__init__.py

@@ -1 +1,4 @@
 """ Generate a complete client and verify that it is correct """
+import pytest
+
+pytest.register_assert_rewrite('end_to_end_tests.end_to_end_live_tests')

end_to_end_tests/baseline_openapi_3.0.json

@@ -2841,15 +2841,17 @@
           "modelType": {
             "type": "string"
           }
-        }
+        },
+        "required": ["modelType"]
       },
       "ADiscriminatedUnionType2": {
         "type": "object",
         "properties": {
           "modelType": {
             "type": "string"
           }
-        }
+        },
+        "required": ["modelType"]
       }
     },
     "parameters": {

end_to_end_tests/baseline_openapi_3.1.yaml

@@ -2835,15 +2835,17 @@ info:
         "modelType": {
           "type": "string"
         }
-      }
+      },
+      "required": ["modelType"]
     },
     "ADiscriminatedUnionType2": {
       "type": "object",
       "properties": {
         "modelType": {
           "type": "string"
         }
-      }
+      },
+      "required": ["modelType"]
     }
   }
   "parameters": {

end_to_end_tests/end_to_end_live_tests.py

@@ -0,0 +1,33 @@
+import importlib
+from typing import Any
+
+import pytest
+
+
+def live_tests_3_x():
+    _test_model_with_discriminated_union()
+
+
+def _import_model(module_name, class_name: str) -> Any:
+    module = importlib.import_module(f"my_test_api_client.models.{module_name}")
+    module = importlib.reload(module)  # avoid test contamination from previous import
+    return getattr(module, class_name)
+
+
+def _test_model_with_discriminated_union():
+    ModelType1Class = _import_model("a_discriminated_union_type_1", "ADiscriminatedUnionType1")
+    ModelType2Class = _import_model("a_discriminated_union_type_2", "ADiscriminatedUnionType2")
+    ModelClass = _import_model("model_with_discriminated_union", "ModelWithDiscriminatedUnion")
+
+    assert (
+        ModelClass.from_dict({"discriminated_union": {"modelType": "type1"}}) ==
+        ModelClass(discriminated_union=ModelType1Class.from_dict({"modelType": "type1"}))
+    )
+    assert (
+        ModelClass.from_dict({"discriminated_union": {"modelType": "type2"}}) ==
+        ModelClass(discriminated_union=ModelType2Class.from_dict({"modelType": "type2"}))
+    )
+    with pytest.raises(TypeError):
+        ModelClass.from_dict({"discriminated_union": {"modelType": "type3"}})
+    with pytest.raises(TypeError):
+        ModelClass.from_dict({"discriminated_union": {}})

end_to_end_tests/golden-record/my_test_api_client/models/a_discriminated_union_type_1.py

@@ -1,38 +1,38 @@
-from typing import Any, Dict, List, Type, TypeVar, Union
+from typing import Any, Dict, List, Type, TypeVar
 
 from attrs import define as _attrs_define
 from attrs import field as _attrs_field
 
-from ..types import UNSET, Unset
-
 T = TypeVar("T", bound="ADiscriminatedUnionType1")
 
 
 @_attrs_define
 class ADiscriminatedUnionType1:
     """
     Attributes:
-        model_type (Union[Unset, str]):
+        model_type (str):
     """
 
-    model_type: Union[Unset, str] = UNSET
+    model_type: str
     additional_properties: Dict[str, Any] = _attrs_field(init=False, factory=dict)
 
     def to_dict(self) -> Dict[str, Any]:
         model_type = self.model_type
 
         field_dict: Dict[str, Any] = {}
         field_dict.update(self.additional_properties)
-        field_dict.update({})
-        if model_type is not UNSET:
-            field_dict["modelType"] = model_type
+        field_dict.update(
+            {
+                "modelType": model_type,
+            }
+        )
 
         return field_dict
 
     @classmethod
     def from_dict(cls: Type[T], src_dict: Dict[str, Any]) -> T:
         d = src_dict.copy()
-        model_type = d.pop("modelType", UNSET)
+        model_type = d.pop("modelType")
 
         a_discriminated_union_type_1 = cls(
             model_type=model_type,

end_to_end_tests/golden-record/my_test_api_client/models/a_discriminated_union_type_2.py

@@ -1,38 +1,38 @@
-from typing import Any, Dict, List, Type, TypeVar, Union
+from typing import Any, Dict, List, Type, TypeVar
 
 from attrs import define as _attrs_define
 from attrs import field as _attrs_field
 
-from ..types import UNSET, Unset
-
 T = TypeVar("T", bound="ADiscriminatedUnionType2")
 
 
 @_attrs_define
 class ADiscriminatedUnionType2:
     """
     Attributes:
-        model_type (Union[Unset, str]):
+        model_type (str):
     """
 
-    model_type: Union[Unset, str] = UNSET
+    model_type: str
     additional_properties: Dict[str, Any] = _attrs_field(init=False, factory=dict)
 
     def to_dict(self) -> Dict[str, Any]:
         model_type = self.model_type
 
         field_dict: Dict[str, Any] = {}
         field_dict.update(self.additional_properties)
-        field_dict.update({})
-        if model_type is not UNSET:
-            field_dict["modelType"] = model_type
+        field_dict.update(
+            {
+                "modelType": model_type,
+            }
+        )
 
         return field_dict
 
     @classmethod
     def from_dict(cls: Type[T], src_dict: Dict[str, Any]) -> T:
         d = src_dict.copy()
-        model_type = d.pop("modelType", UNSET)
+        model_type = d.pop("modelType")
 
         a_discriminated_union_type_2 = cls(
             model_type=model_type,

end_to_end_tests/golden-record/my_test_api_client/models/model_with_discriminated_union.py

@@ -59,23 +59,34 @@ def _parse_discriminated_union(
                 return data
             if isinstance(data, Unset):
                 return data
-            try:
-                if not isinstance(data, dict):
-                    raise TypeError()
-                componentsschemas_a_discriminated_union_type_0 = ADiscriminatedUnionType1.from_dict(data)
-
-                return componentsschemas_a_discriminated_union_type_0
-            except:  # noqa: E722
-                pass
-            try:
-                if not isinstance(data, dict):
-                    raise TypeError()
-                componentsschemas_a_discriminated_union_type_1 = ADiscriminatedUnionType2.from_dict(data)
-
-                return componentsschemas_a_discriminated_union_type_1
-            except:  # noqa: E722
-                pass
-            return cast(Union["ADiscriminatedUnionType1", "ADiscriminatedUnionType2", None, Unset], data)
+            if not isinstance(data, dict):
+                raise TypeError()
+            if "modelType" in data:
+                _discriminator_value = data["modelType"]
+
+                def _parse_componentsschemas_a_discriminated_union_type_1(data: object) -> ADiscriminatedUnionType1:
+                    if not isinstance(data, dict):
+                        raise TypeError()
+                    componentsschemas_a_discriminated_union_type_1 = ADiscriminatedUnionType1.from_dict(data)
+
+                    return componentsschemas_a_discriminated_union_type_1
+
+                def _parse_componentsschemas_a_discriminated_union_type_2(data: object) -> ADiscriminatedUnionType2:
+                    if not isinstance(data, dict):
+                        raise TypeError()
+                    componentsschemas_a_discriminated_union_type_2 = ADiscriminatedUnionType2.from_dict(data)
+
+                    return componentsschemas_a_discriminated_union_type_2
+
+                _discriminator_mapping = {
+                    "type1": _parse_componentsschemas_a_discriminated_union_type_1,
+                    "type2": _parse_componentsschemas_a_discriminated_union_type_2,
+                }
+                if _parse_fn := _discriminator_mapping.get(_discriminator_value):
+                    return cast(
+                        Union["ADiscriminatedUnionType1", "ADiscriminatedUnionType2", None, Unset], _parse_fn(data)
+                    )
+            raise TypeError("unrecognized value for property modelType")
 
         discriminated_union = _parse_discriminated_union(d.pop("discriminated_union", UNSET))
 

end_to_end_tests/test_end_to_end.py

@@ -1,13 +1,17 @@
+import os
 import shutil
 from filecmp import cmpfiles, dircmp
 from pathlib import Path
-from typing import Dict, List, Optional, Set
+import sys
+from typing import Callable, Dict, List, Optional, Set
 
 import pytest
 from click.testing import Result
 from typer.testing import CliRunner
 
 from openapi_python_client.cli import app
+from .end_to_end_live_tests import live_tests_3_x
+
 
 
 def _compare_directories(
@@ -83,6 +87,7 @@ def run_e2e_test(
     golden_record_path: str = "golden-record",
     output_path: str = "my-test-api-client",
     expected_missing: Optional[Set[str]] = None,
+    live_tests: Optional[Callable[[str], None]] = None,
 ) -> Result:
     output_path = Path.cwd() / output_path
     shutil.rmtree(output_path, ignore_errors=True)
@@ -97,6 +102,13 @@ def run_e2e_test(
     _compare_directories(
         gr_path, output_path, expected_differences=expected_differences, expected_missing=expected_missing
     )
+    if live_tests:
+        old_path = sys.path.copy()
+        sys.path.insert(0, str(output_path))
+        try:
+            live_tests()
+        finally:
+            sys.path = old_path
 
     import mypy.api
 
@@ -131,11 +143,11 @@ def _run_command(command: str, extra_args: Optional[List[str]] = None, openapi_d
 
 
 def test_baseline_end_to_end_3_0():
-    run_e2e_test("baseline_openapi_3.0.json", [], {})
+    run_e2e_test("baseline_openapi_3.0.json", [], {}, live_tests=live_tests_3_x)
 
 
 def test_baseline_end_to_end_3_1():
-    run_e2e_test("baseline_openapi_3.1.yaml", [], {})
+    run_e2e_test("baseline_openapi_3.1.yaml", [], {}, live_tests=live_tests_3_x)
 
 
 def test_3_1_specific_features():

openapi_python_client/parser/properties/schemas.py

@@ -46,6 +46,13 @@ def parse_reference_path(ref_path_raw: str) -> Union[ReferencePath, ParseError]:
     return cast(ReferencePath, parsed.fragment)
 
 
+def get_reference_simple_name(ref_path: str) -> str:
+    """
+    Takes a path like `/components/schemas/NameOfThing` and returns a string like `NameOfThing`.
+    """
+    return ref_path.split("/", 3)[-1]
+
+
 @define
 class Class:
     """Represents Python class which will be generated from an OpenAPI schema"""