This does the trick, in case anyone else needs the code, here it is.
/// <summary>
/// The fluent validation model validator provider ex.
/// </summary>
internal class FluentValidationModelValidatorProviderEx : FluentValidationModelValidatorProvider
{
/// <summary>
/// Initialises a new instance of the <see cref="FluentValidationModelValidatorProviderEx"/> class.
/// </summary>
/// <param name="validatorFactory">
/// The validator factory.
/// </param>
public FluentValidationModelValidatorProviderEx(IValidatorFactory validatorFactory) : base(validatorFactory)
{
}
/// <summary>
/// get the fluent validators.
/// </summary>
/// <param name="metadata">The metadata.</param>
/// <param name="context">The context.</param>
/// <returns>the set of validators, if any validators are resolved.</returns>
/// <remarks>If the fluent validator(s) are supplied, then clear the current set of model errors.</remarks>
public override IEnumerable<ModelValidator> GetValidators(ModelMetadata metadata, ControllerContext context)
{
var validators = base.GetValidators(metadata, context);
var modelValidators = validators as ModelValidator[] ?? validators.ToArray();
if (modelValidators.Any())
context.Controller.ViewData.ModelState.Clear();
return modelValidators;
}
/// <summary>
/// configure fluent validation.
/// </summary>
/// <param name="configurationExpression">The configuration expression.</param>
internal static void ConfigureFluentValidation(Action<FluentValidationModelValidatorProvider> configurationExpression = null)
{
configurationExpression = configurationExpression ?? (Action<FluentValidationModelValidatorProvider>)(param0 => { });
FluentValidationModelValidatorProvider validatorProvider = new FluentValidationModelValidatorProviderEx((IValidatorFactory)null);
configurationExpression(validatorProvider);
DataAnnotationsModelValidatorProvider.AddImplicitRequiredAttributeForValueTypes = false;
ModelValidatorProviders.Providers.Add((ModelValidatorProvider)validatorProvider);
}
}