'Conditionally executing rule with FluentValidation for .NET

I'm using FluentValidation for .NET

I have these three rules:

RuleFor(customer => customer.Name).NotEmpty();
RuleFor(customer => customer.Phone).NotEmpty();
RuleFor(customer => customer.Birthday).NotEmpty();

And I want to execute this one only if the three others are validated successfully.

RuleFor(customer => customer).Must(IsUnique).WithMessage("...");

My requirement is not to use Chaining Validators like here because the first three will not be evaluated if the previous of each one failed validation.

What I want is if one of the first three are empty, to display to the user the required fields. If all three are not empty, then I want to validate the last one.

c++sharpasp.net-mvcfluentvalidation


Solution 1:[1]

RuleFor(customer => customer)
.Must(IsUnique)
.WithMessage("...")
.When(x => !string.IsNullOrEmpty(x.Name) && !string.IsNullOrEmpty(x.Phone) &&!string.IsNullOrEmpty(x.Birthday));

Solution 2:[2]

Given your reply to Tomas's answer, I came up with the following solution:

public class CustomerValidator : AbstractValidator<Customer>
{
    private class CustomerFieldsValidator : AbstractValidator<Customer>
    {
        public CustomerFieldsValidator()
        {
            RuleFor(customer => customer.Name).NotEmpty();
            RuleFor(customer => customer.Phone).NotEmpty();
            RuleFor(customer => customer.Birthday).NotEmpty();
        }
    }

    public CustomerValidator()
    {
        Include(new CustomerFieldsValidator());
        RuleFor(customer => customer)
           .Must(IsUnique)
           .When(customer => new CustomerFieldsValidator().Validate(customer).IsValid)
           .WithMessage("...");
    }
}

If CustomerValidator has only two rules (counting nested validator as 1 rule), you can get rid of .When() clause to shorten the code further.

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Tomas Grosup
Solution 2 KifoPL

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