FromBody does not ignore properties decorated with JsonIgnore on POST

I’m building a controller that should recerive a Workflow type via the request’s body, but it doesn’t respect the JsonIgore attribute and throws a model validation error that says:

"The Name field is required."

When I look into what body Swagger suggests then it’s what one would expect:

{
  "schedule": "string",
}

But even when I explicitly specify name in my request, it still does throw the same exception. Why?

This is my test setup:

public class Workflow
{
    [JsonIgnore]
    public string Name { get; set; }

    public string Schedule { get; set; }

    // ...
}

[ApiController]
[Route("api/[controller]")]
public class WorkflowsController : ControllerBase
{    

    [HttpPut("{workflowName}")]
    public async Task<int> CreateWorkflow(string workflowName, [FromBody] Workflow workflow)
    {
        return await Task.FromResult(0);
    }
}

Do I have to create another class for the body or is there a way to fix that strange behavior?

>Solution :

JsonIgnore will just ignore that property for serialisation, meaning it won’t set it. Since you’re using nullable reference types, the property Name is expected to have a value & model validation will take this into account.

You can either give it a default value

public string Name { get; set; } = string.Empty;

Or make it nullable

public string? Name { get; set; }