FluentValidation MVC Required Foreign Key

Question

I'm creating UserValidator to validate UserViewModel using FluentValidation MVC 5

public class UserValidator : AbstractValidator<UserViewModel>
{
    public UserValidator()
    {
        RuleFor(u => u.UserName)
            .NotEmpty()
            .Length(1, 50);
        RuleFor(u => u.Password)
            .NotEmpty()
            .Length(6, 20);
        // How to validate Role must be selected from dropdownlist?
    }
}

UserViewModel
- UserID - int
- Username - varchar(50)
- Password - varchar(20)
- RoleID - int

How to create RuleFor for RoleID, that user must select the role before submit? If using DataAnnotation, I can simply use [Required] attribute.

RuleFor(x => x.RoleID).NotEqual(0).WithMessage("Rold ID is required"); — Bhasyakarulu Kottakota, Oct 02 '14 at 11:27
What type is `RoleID`? You can use `NotNull` or `NotEmpty` [validators](https://fluentvalidation.codeplex.com/wikipage?title=Validators). — Zabavsky, Oct 02 '14 at 11:27

score 1 · Accepted Answer · answered Oct 02 '14 at 11:35

1

Check the documentation for Built in Validators.

You can use NotEmpty:

Ensures that the specified property is not null, an empty string or whitespace (or the default value for value types, eg 0 for int)

RuleFor(u => u.RoleID).NotEmpty()

or make the property nullable and use NotNull:

Ensures that the specified property is not null.

RuleFor(u => u.RoleID).NotNull()

answered Oct 02 '14 at 11:35

Zabavsky

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Should we also check if specific ID exists in the database? So that FK is not violated? – Ish Thomas Mar 25 '20 at 16:53

FluentValidation MVC Required Foreign Key

1 Answers1