Swagger UI OpenAPI nullable model properties not nullable in latest stable 5.16.0

[Seramis]

I just recently upgraded from earlier version of FastEndpoints to the latest version of 5.16.0 and noticed that all request model properties have some default values in my swagger-ui. I then dug into it a bit and found that this bug has been introduced in 5.16.0 as it is working as expected in 5.15.0.

The swagger.json seems to be correct in both versions as the property is marked with "nullable": true. So i suspect the bug to reside in the swagger-ui part.

To reproduce:

• Have FastEndpoint with model containing QueryParam property that is nullable. I recommend something, that defaults to some human-visible value, like int (0) or datetime (current time or 0000-... date)
• Generated OpenAPI definition and Swagger UI.
  • 5.15.0 -> the input box for query parameter is empty
  • 5.16.0 -> the input box is prefilled with default value of datatype

[dj-nitehawk]

changelog mentions how to turn it off:

FastEndpoints/Src/Library/changelog.md

Lines 90 to 99 in 80f6cc5

	This behavior can be turned off like so:
	```cs
	builder.Services.SwaggerDocument(o =>
	{
	o.DocumentSettings = s =>
	{
	s.GenerateExamples = false;
	};
	});
	```

let me know if that sorts it out. if not i'll look in to it further.

thanks!

[Seramis]

@dj-nitehawk Thanks! It did, thank you!
Maybe having it turned on by default causes too much confusion, as the engineer puts the questionmark on a property deliberately to make it nullable and then confusingly sees some values in SwaggerUI?

Thanks again! I can now continue to use the latest version. It's a great library!

[dj-nitehawk]

this is now fixed in 5.16.0.3-beta

you can get rid of:

     o.DocumentSettings = s => 
     { 
         s.GenerateExamples = false; 
     };

see changelog.

thanks for reporting the issue 🙏