GetTaskByIdQuery.cs

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using MediatR;
using TaskManagement.Application.Interfaces;
using TaskManagement.Domain.Common;
 
namespace TaskManagement.Application.Queries;
 
public sealed class GetTaskByIdQuery : IRequest<Result<TaskDto>>
{
    public Guid TaskId { get; init; }
 
    public GetTaskByIdQuery(Guid taskId)
    {
        TaskId = taskId;
    }
}
 
public sealed class GetTaskByIdQueryHandler : IRequestHandler<GetTaskByIdQuery, Result<TaskDto>>
{
    private readonly ITaskReadRepository _readRepository;
    public GetTaskByIdQueryHandler(ITaskReadRepository readRepository)
    {
        _readRepository = readRepository;
    }
    public async Task<Result<TaskDto>> Handle(
        GetTaskByIdQuery request,
        CancellationToken cancellationToken)
    {
        ArgumentNullException.ThrowIfNull(request);
 
        var task = await _readRepository.GetByIdAsync(request.TaskId, cancellationToken).ConfigureAwait(false);
        if (task is null)
            return Result.Failure<TaskDto>(TaskErrors.NotFound(request.TaskId));
        return Result.Success(task);
    }
}
// DTO optimizado para lecturas. Mantenerlo como tipo basado en propiedades para que Dapper pueda
// materializar sin requerir una firma de constructor exacta de tipos de proveedor.
public sealed class TaskDto
{
    public string Id { get; init; } = string.Empty;
    public string Title { get; init; } = string.Empty;
    public string Description { get; init; } = string.Empty;
    public string Status { get; init; } = string.Empty;
    public string Priority { get; init; } = string.Empty;
    public DateTime? DueDate {
        get; init;
    }
    public DateTime CreatedAt {
        get; init;
    }
    public string CreatedBy { get; init; } = string.Empty;
    public string? AssignedTo {
        get; init;
    }
}