ServiceStack - FluentValidation

Question

I have a question about using a FluentValidation with ServiceStack.

For example:

[Route("/customers/{Id}", "PUT")]
public class UpdateCustomer : IReturn<Customer>
{
    public int Id { get; set; }

    public string FirstName { get; set; }
    public string LastName { get; set; }
}

[Route("/customers/{Id}", "DELETE")]
public class DeleteCustomer : IReturnVoid
{
    public int Id { get; set; }
}

public class Customer
{
    public int Id { get; set; }

    public string FirstName { get; set; }
    public string LastName { get; set; }
}

When I'm updating customer info, I want to validate for example all params, but when deleting it for example, I just want to make sure that Id is for example positive int. So, FirstName, LastName, etc. everything else I don't care in that case.

If I implement FluentValidator on Customer class, I will have to put all the logic inside the validator for that (to apply different rules based on request route)? Or there's more elegant way for doing that?

Answer 1

The validators should only be on the Request DTO's, e.g:

public class UpdateCustomerValidator : AbstractValidator<UpdateCustomer>
{
    public UpdateCustomerValidator()
    {
        RuleFor(r => r.Id).GreaterThan(0);
        RuleFor(r => r.FirstName).NotEmpty();
        RuleFor(r => r.LastName).NotEmpty();
    }
}

and likewise for DeleteCustomer, e.g:

public class DeleteCustomerValidator : AbstractValidator<DeleteCustomer>
{
    public DeleteCustomerValidator()
    {
        RuleFor(r => r.Id).GreaterThan(0);
    }
}

Although creating a whole validator for a single field can be overkill so you could instead just add the validation in your Service, e.g:

public class CustomerServices : Service
{
    public void Any(DeleteCustomer request)
    {
        if (request.Id <= 0)
            throw new ArgumentException("Id Required", "Id")

        Db.DeleteById<Customer>(request.Id);
    }
}