Question

目前，我对从父ID中获取子数据并用硬编码文本更新子数据有一些了解。家长班： `

public class Ride
    {
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public int Id { get; set; }
        public DateTime RideStartTime { get; set; }
        public string DestinationLongitude { get; set; }
        public string DestinationLatitude { get; set; }
        public int SeatAvailable { get; set; }
        public Double TotalCost { get; set; } = 0;
        public Double TotalDistance { get; set; } = 0;

        //Ride has Many Request
        public ICollection<Request> Requests { get; set; }


    }

`

儿童班

  public class Request : IEntity
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int Id { get; set; }

    [Required]
    public string PickupLongitude { get; set; }
    [Required]
    public string PickupLatitude { get; set; }

    public Double? EstimatedCost { get; set; } = 0;
    public Double? Rating { get; set; } = 0;
    public int RideId { get; set; }
    public Ride Ride { get; set; }


}

情况是，当我需要将所有子状态列更新为“确认”时，我需要先通过搜索rideId来找到父类，如果找到了游乐设施，它将更新其子类属性。我正在使用EF核心保存数据。

  // PUT api/<controller>/5
    [HttpPut("{id}/confirm")]
    public IActionResult ConfirmRide(int id, [FromBody]Ride ride)
    {
        try
        {
            if (ride.IsObjectNull())
            {
                _logger.LogError("Ride object sent from client is null.");
                return BadRequest("Ride object is null");
            }

            if (!ModelState.IsValid)
            {
                _logger.LogError("Invalid ride object sent from client.");
                return BadRequest("Invalid model object");
            }

            var dbRide = _repository.Ride.GetRideById(id);
            if (dbRide == null)
            {
                _logger.LogError($"Ride with id: {id}, hasn't been found in db.");
                return NotFound();
            }

            _repository.Ride.ConfirmRide(dbRide, ride, id, "Confirmed");
            //_repository.Ride.
            _repository.Save();

            return NoContent();
        }
        catch (Exception ex)
        {
            _logger.LogError($"Something went wrong inside UpdateRide action: {ex.Message}");
            return StatusCode(500, "Internal server error");
        }
    }

当前，这是我保存或更新数据的逻辑，你们可以帮助我如何基于父ID更新子类。

Answer 1

How to add/update child entities when updating a parent entity in EF

我得到了这个解决方案，并用其他资源对其进行了修改。

 public void ConfirmRide(Ride dbRide, int id, string status)
    {
        dbRide.MapStatus(status);
        Update(dbRide);
        var existingParent = RepositoryContext.Rides
                             .Where(p => p.Id == id)
                             .Include(p => p.Requests).Where(r => r.Requests.Any( request => request.Status == "Approved"))
                             .SingleOrDefault();
        if (existingParent != null)
        {

            foreach (var existingChild in existingParent.Requests.ToList())
            {
                existingChild.Status = "Confirmed";
            }

        }
        RepositoryContext.SaveChanges();


    }

如何使用父级ID

1 个答案: