Model Validation using Data Annotations not working on Mac VS.NET - macos

Question

I created a new Web API Application on MacOS with VS.NET. I added a model with the following code:
public class PersonAddRequest {
[Required]
public string FirstName { get; set; }
public string LastName { get; set; }
}
Then I created a Web API Controller like so:
[Route("api/[controller]")]
[ApiController]
public class PeopleController : ControllerBase {
[HttpPost]
public IActionResult Post(PersonAddRequest model) {
return base.Ok(model);
}
}
When using PostMan I post JSON as so (note firstName is missing):
{
"lastName":"McDonalds"
}
When I run this code on a Web API Application created on a Windows OS validation works as expected. However, when I create the project in MacOS validation doesn't work.
When I create the project in Windows OS then open and run it on MacOS, validation works!
So my question, is this a feature that is missing as part of the scaffolding on VS.NET for Mac?

Answer 1

You require the FromBody attribute for the body argument:
[Route("api/[controller]")]
[ApiController]
public class PeopleController : Controller
{
[HttpPost]
public IActionResult Post([FromBody]PersonAddRequest model)
{
return Ok(model);
}
}
This is required for model validation.
Here's an example git repo using this form of model validation that is confirmed working on MacOS Mojave 10.14.4

Answer 2

I want to thank #nelsontruran for helping me explore VS.NET on Mac. I'm actually running a later version of the Mac (10.14.5 Mojave). However, the version had nothing to do with the original problem.
Thru the patients and persistent help of #nelsontruran I recreated the project but instead of using the suggested templates I dug around a little for the correct application (don't trust the suggested applications in VS.NET). Here's the step-by-step instructions on how to create an API that automatically performs model validation:
Open VS.NET for Mac
Create a new project
When prompted to "Choose a template for your new project", select "App" under the ".Net Core" section on the left side pane.
On the right side pane, select API
From there you can review #nelsontruran's example on git to see the magic of Model Validation.
I believe I might have been choosing "Web Application" thinking that it would be the same in Mac as it is in Windows.
A simple oversight on my part. I hope this helps someone who was confused and struggling like me.
Thank you again to #nelsontruran!!!