constellation-api/CH.CQRS/Command/Energy/UpdateEnergyRateCommand.cs

using System.Data;
using CH.CQRS.Service.Energy;
using CH.CQRS.Service.Energy.Options;
using CH.Dal;
using CH.Dal.DbEntity;
using CH.Dal.Validators;
using FluentValidation;
using Microsoft.EntityFrameworkCore;
using OpenHarbor.CQRS.Abstractions;

namespace CH.CQRS.Command.Energy;

public class UpdateEnergyRateCommand
{
  public long RateId { get; set; }
  public string? Name { get; set; }
  public DateTime? StartedAt { get; set; }
  public decimal? Rate { get; set; }
}
public class UpdateEnergyRateCommandHandler(EnergyService energyService) : ICommandHandler<UpdateEnergyRateCommand>
{
  public Task HandleAsync(UpdateEnergyRateCommand command, CancellationToken cancellationToken = new CancellationToken())
  {
    return energyService.UpdateEnergyRateAsync(new UpdateEnergyRateCommandOptions
    {
      RateId = command.RateId,
      Name = command.Name,
      StartedAt = command.StartedAt,
      Rate = command.Rate
    }, cancellationToken);
  }
}

public class UpdateEnergyRateCommandValidator : AbstractValidator<UpdateEnergyRateCommand>
{
  public UpdateEnergyRateCommandValidator(CHDbContext dbContext)
  {
    RuleFor(command => command.Name)
      .NotEmpty()
      .MinimumLength(3)
      .When(command => false == String.IsNullOrWhiteSpace(command.Name))
      .MustAsync(async (name, cancellationToken) =>
      {
        var nameInUse = await dbContext.EnergyRates.AnyAsync(energyRate => energyRate.Name == name, cancellationToken);
        return false == nameInUse;
      })
      .WithMessage("This Name is already in use by another energy rate.");
    
    RuleFor(command => command.RateId)
      .NotEmpty()
      .SetValidator(new DbEntityExistValidator<EnergyRate,long>(dbContext))
      .WithMessage("The provided Rate Id is invalid.");

    RuleFor(command => command.Rate)
      .GreaterThanOrEqualTo(0);
  }
}