fluentvalidation-rules.cs

using System.Net.Http;
using FluentValidation;
using WidgetApi.Models;

namespace WidgetApi.FunctionHelpers
{
  public class BaseValidator<T> : AbstractValidator<T> where T : ModelBase
  {
    public BaseValidator()
    {
      RuleSet(HttpMethod.Post.Method, () =>
      {
        RuleFor(x => x.Id).Empty()
          .WithMessage($"Id field cannot be specified when POSTing a new item '{typeof(T).Name}'");
      });

      RuleSet(HttpMethod.Patch.Method, () =>
      {
        RuleFor(x => x.Id).NotEmpty();
      });

      RuleSet("audit", () =>
      {
        RuleFor(x => x.CreatedBy).Empty();
        RuleFor(x => x.CreatedOn).Empty();
        RuleFor(x => x.UpdatedBy).Empty();
        RuleFor(x => x.UpdatedOn).Empty();
      });
    }
  }
  
  public class WidgetValidator : BaseValidator<Widget>
  {
    public WidgetValidator()
    {
      RuleSet(HttpMethod.Post.Method, () =>
      {
        RuleFor(x => x.Title).NotEmpty();
        RuleFor(x => x.Description).NotEmpty();
      });
    }
  }
  
  public class UserValidator : BaseValidator<User> { }
}