fix: import Optional when properties are nullable or not required

CHANGELOG.md

@@ -8,6 +8,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## 0.5.5 - Unreleased
 ### Fixes
 - Improved trailing comma handling in endpoint generation (#178 & #179). Thanks @dtkav!
+- `Optional` is now properly imported for `nullable` fields (#177 & #180). Thanks @dtkav!
 
 
 ## 0.5.4 - 2020-08-29

end_to_end_tests/fastapi_app/__init__.py

@@ -6,7 +6,7 @@
 from typing import Dict, List, Union
 
 from fastapi import APIRouter, Body, FastAPI, File, Header, Query, UploadFile
-from pydantic import BaseModel
+from pydantic import BaseModel, Field
 from starlette.responses import FileResponse
 
 app = FastAPI(title="My Test API", description="An API for testing openapi-python-client",)
@@ -44,7 +44,7 @@ class AModel(BaseModel):
 
     an_enum_value: AnEnum
     nested_list_of_enums: List[List[DifferentEnum]] = []
-    some_dict: Dict[str, str]
+    some_dict: Dict[str, str] = Field(..., nullable=True)
     aCamelDateTime: Union[datetime, date]
     a_date: date
 

end_to_end_tests/fastapi_app/openapi.json

@@ -493,7 +493,8 @@
                         "type": "object",
                         "additionalProperties": {
                             "type": "string"
-                        }
+                        },
+                        "nullable": true
                     },
                     "aCamelDateTime": {
                         "title": "Acameldatetime",

end_to_end_tests/golden-master/my_test_api_client/models/a_model.py

@@ -13,7 +13,7 @@ class AModel:
     """ A Model for testing all the ways custom objects can be used  """
 
     an_enum_value: AnEnum
-    some_dict: Dict[Any, Any]
+    some_dict: Optional[Dict[Any, Any]]
     a_camel_date_time: Union[datetime.datetime, datetime.date]
     a_date: datetime.date
     nested_list_of_enums: Optional[List[List[DifferentEnum]]] = field(

openapi_python_client/parser/properties.py

@@ -63,7 +63,7 @@ def get_imports(self, *, prefix: str) -> Set[str]:
         Args:
             prefix: A prefix to put before any relative (local) module names.
         """
-        if not self.required:
+        if self.nullable or not self.required:
             return {"from typing import Optional"}
         return set()