OpenAPI: how to get string marked as Required

[ArryMatt]

Firstly, I'm still on version 3.0.17 and will be here for a while on this project. I do want to upgrade, just it's not the correct time for this project.

I have a delete command that has a string of SerialNumber that I want to be marked in the OpenAPI as required and I can't make it so.

I tried:
[Required]
[Key]
Fluent validator of NotNull & NotEmpty
[JsonProperty(Required = Required.Always)]

I've been through the code and am at a loss.

What am I missing?

[MarkusBernhardt]

Hi Arry,

3.0.17 is too old for that.

This was merged in with #102 into v4.0.56-beta.4.
#142 would bring more OpenAPI functionality, but not merged in right now.

Cheers,
Markus