New Post: FluentValidation does not honour ModelMetadata.IsRequired

I'm using a custom ModelMetadataProvider to help build a dynamic UI. One thing that it does is to set ModelMetadata.IsRequired based on whether the property is required or not.

With the default DataAnnotationsModelValidatorProvider in MVC 4 this enough to set up the necessary client side validation to ensure text is entered e.g.

<input class="input-mini valid" data-val="true" data-val-required="The Background Color field is required." id="Styles_bodyBackground_" name="Styles[bodyBackground]" type="text" value="#ffffff">

However, with the FluentValidationModelValidatorProvider enabled I no longer get the client side required validation.

Here is my initialization code:

            FluentValidationModelValidatorProvider.Configure(cfg =>
            {
                cfg.ValidatorFactory = new StructureMapValidatorFactory();
                cfg.AddImplicitRequiredValidator = false;
            }););

Most of my validation is done using attributes, I'm only using FluentValidation to perform complex validation as it works well with DI.