Child Model Validation using Parent Model Values. Fluent Validation. MVC4

Question

Below is a simplified version of my problem.

I can not flatten the model. There is a List of \"children\" that I need to validate a birthday.

I can not seem

Answer 1

Building on the answer of @kristoffer-jalen it is now:

public class ParentValidator : AbstractValidator
{
    public ParentValidator()
    {
         RuleFor(model => model.Name).NotEmpty();
         //RuleFor(model => model.Children)
         //    .SetCollectionValidator(model => new ChildValidator(model))
         RuleForEach(model => model.Children)
                .SetValidator(model => new ChildValidator(model));
    }
}

public class ChildValidator : AbstractValidator
{
    public ChildValidator(Parent parent)
    {
        RuleFor(model => model.ChildProperty).NotEmpty();
        RuleFor(model => model.Birthday).Must(birthday => parent.Birthday < birthday);
    }
}

as SetCollectionValidator is deprecated.