Form field is required even if not defined so-CodePudding

I am using Net 6 with Fluent Validation and I have a form with the field:

  <form method="post" asp-controller="Product" asp-action="Create" asp-antiforgery="true" autocomplete="off">
    <label asp-for="Description">Description</label>
    <input asp-for="Description" type="text"> 
    <span asp-validation-for="Description" ></span>
    ...
    <button  name="button">Create</button>   
  </form>

The ProductModel is:

public class ProductModel {

  public String Description { get; set; }

  // ...
}

And the ProductModel Fluent Validator is:

public class ModelValidator : AbstractValidator {

public ModelValidator() {

  RuleFor(x => x.Description)
    .Length(0, 200).WithMessage("Do not exceed 200 characters");

  // ...

}

}

When I submit the form I get an error on description if I let it empty:

The Description field is required.

But my validator is not requiring the description.

This happens to all fields. When not filled I get a similar error.

What am I missing?

CodePudding user response：

Did a little bit of digging, this seems to be due to a problem relating to model validation changes; specifically in ASP Net 6. I found a documentation link that can explain it better than me but I'll give a code implementation also: Microsoft docs

builder.Services.AddControllers(
    options => options.SuppressImplicitRequiredAttributeForNonNullableReferenceTypes = true);

//Removes the required attribute for non-nullable reference types.

Hope this helps, I've taken this code straight from the MS docs, so if it doesn't fix your issue, there is likely another cause.

CodePudding user response：

Here is very detailed explaintion about this issue in the MC document:

Gets or sets a value that determines if the inference of RequiredAttribute for properties and parameters of non-nullable reference types is suppressed. If false (the default), then all non-nullable reference types will behave as-if [Required] has been applied. If true, this behavior will be suppressed; nullable reference types and non-nullable reference types will behave the same for the purposes of validation.

There are two methods to solve this problem, one global and one partial.

You can set:

builder.Services.AddControllersWithViews(options => options.SuppressImplicitRequiredAttributeForNonNullableReferenceTypes = true)

In your Program.cs (.Net6), After using this method, all properties can be null.

Another method is in your model, you can set properties like this:

public class ProductModel {

  public String? Description { get; set; }

  // ...
}

? means this property can be null, in this method, You can specify which properties can be null.