Fix mypy issue with generated from_dict on reference properties

Author: dbanty

CHANGELOG.md

@@ -5,7 +5,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## 0.1.1 - 2020-03-06
-- Fix mypy issue in generated models with datetime properties
+- Fix mypy issue in generated models `from_dict` with datetime or reference properties
 
 ## 0.1.0 - 2020-02-28
 - Initial Release

openapi_python_client/templates/ref_property.pyi

@@ -3,5 +3,5 @@
 {% else %}
         {{ property.name }} = None
         if ({{ property.name }}_data := d.get("{{ property.name }}")) is not None:
-            {{ property.name }} = {{ property.reference.class_name }}.from_dict({{ property.name }}_data)
+            {{ property.name }} = {{ property.reference.class_name }}.from_dict(cast(Dict, {{ property.name }}_data))
 {% endif %}