使用父模型值进行子模型验证.流畅的验证.MVC4

Question

以下是我的问题的简化版本.

我不能压扁模型.我需要一个"孩子"列表来验证生日.

我似乎无法在Parent类中引用日期,并想知道如何在Fluent验证中完成此操作？

模型

[Validator(typeof(ParentValidator))]
public class Parent
{
    public string Name { get; set; }
    public DateTime Birthdate { get; set; }

    public List<Child> Children { get; set; }
}

public class Child
{
    public string ChildProperty{ get; set; }
    public DateTime Birthdate { get; set; }
}

验证器

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

public class ChildValidator : AbstractValidator<Child>
{
    public ChildValidator()
    {
        RuleFor(model => model.ChildProperty).NotEmpty();
        //Compare birthday to make sure date is < Parents birthday
    }
}

Answer 1

像这样创建一个自定义属性验证器

public class AllChildBirtdaysMustBeLaterThanParent : PropertyValidator
{
    public AllChildBirtdaysMustBeLaterThanParent()
        : base("Property {PropertyName} contains children born before their parent!")
    {
    }

    protected override bool IsValid(PropertyValidatorContext context)
    {
        var parent = context.ParentContext.InstanceToValidate as Parent;
        var list = context.PropertyValue as IList<Child>;

        if (list != null)
        {
            return ! (list.Any(c => parent.BirthDay > c.BirthDay));
        }

        return true;
    }
}

添加这样的规则

public class ParentValidator : AbstractValidator<Parent>
{
    public ParentValidator()
    {
        RuleFor(model => model.Name).NotEmpty();
        RuleFor(model => model.Children)
               .SetValidator(new AllChildBirtdaysMustBeLaterThanParent());

        // Collection validator
        RuleFor(model => model.Children).SetCollectionValidator(new ChildValidator());
    }
}

Custom Property验证器的替代方法是使用Custom方法:

    public ParentValidator()
    {
        RuleFor(model => model.Name).NotEmpty();
        RuleFor(model => model.Children).SetCollectionValidator(new ChildValidator());

        Custom(parent =>
        {
            if (parent.Children == null)
                return null;

            return parent.Children.Any(c => parent.BirthDay > c.BirthDay)
               ? new ValidationFailure("Children", "Child cannot be older than parent.")
               : null;
        });
    }

显示失败indicies的粗暴的方法:(也许应该是一些其他标识的名称)

public class ParentValidator : AbstractValidator<Parent>
{
    public ParentValidator()
    {
        RuleFor(m => m.Children).SetCollectionValidator(new ChildValidator());

        Custom(parent =>
        {
            if (parent.Children == null)
                return null;

            var failIdx = parent.Children.Where(c => parent.BirthDay > c.BirthDay).Select(c => parent.Children.IndexOf(c));
            var failList = string.Join(",", failIdx);

            return failIdx.Count() > 0
               ? new ValidationFailure("Children", "Child cannot be older than parent. Fail on indicies " + failList)
               : null;
        });
    }

}

Answer 2

使用set child validator有一种更简单的方法:

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

    }
}

public class ParentValidator : AbstractValidator<Parent>
{
    public ParentValidator()
    {
         RuleFor(model => model.Name).NotEmpty();
    }

    public override ValidationResult Validate(Parent parent)
    {
        RuleFor(model => model.Children).SetCollectionValidator(new ChildValidator(this));

        return base.Validate();
    }

}

Answer 3

基于@kristoffer-jalen 的回答，现在是：

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

如SetCollectionValidator已被弃用。

Answer 4

如今，通过使用扩展方法并将父对象传递给子验证器，可以进一步简化@ johnny-5 的答案SetCollectionValidator：

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

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