Specs with vendor extensions might lead to invalid Python code

[hajs]

Users can add additional information with x-fields. But Python does not accept identifiers with dashses.

Here are some common vendor extensions documented: https://github.com/Redocly/redoc/blob/main/docs/redoc-vendor-extensions.md#x-logo

Here is example spec:

openapi: 3.0.0
info:
  title: Example
  version: 1.0.0
  x-audience: company-internal
  x-logo:
    url: https://www.example.com/company-logo.png

The generated code looks like this

app = FastAPI(
    title='Example',
    version='1.0.0',
    x - audience='company-internal',
    x - logo={'url': 'https://www.example.com/company-logo.png'},
)

I fixed it this way:

--- fastapi_code_generator/template/main.jinja2.orig    2023-02-13 16:11:00.677867572 +0100
+++ fastapi_code_generator/template/main.jinja2 2023-02-13 16:37:28.944897684 +0100
@@ -8,7 +8,9 @@
     {% if info %}
     {% for key,value in info.items() %}
     {% set info_value= value.__repr__() %}
+    {%- if not key.startswith("x-") -%} 
     {{ key }} = {{info_value}},
+    {%- endif -%}
     {% endfor %}
     {% endif %}
     )

First I tried to add all fields as a dict passed as kwargs:

app = FastAPI(**{
    'title': 'Example',
    'version':  '1.0.0',
    'x-audience': 'company-internal',
    'x-logo': {'url': 'https://www.example.com/company-logo.png'},
})

But ignoring these fields seems sufficient because FastAPI ignores them anyway.