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FluentValidation–Validating collections

On one of my projects we are using FluentValidation. After upgrading to FluentValidation 8 the way we had to validate our collections changed.

Before we were using this:

RuleFor(m => m.ToAddresses).SetCollectionValidator(new MailAddressValidator());
view raw SetCollectionValidator.cs hosted with ❤ by GitHub

Now we had to use the RuleForEach method:

RuleForEach(m => m.ToAddresses).SetValidator(new MailAddressValidator());
view raw RuleForEach.cs hosted with ❤ by GitHub

But what if you also want to validate if the collection itself is empty or not. This is still possible through RuleFor:

RuleFor(m => m.ToAddresses).NotEmpty().WithMessage("You need to set at least one to address");
view raw RuleFor.cs hosted with ❤ by GitHub

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