EFCore：寻找不存在的列？

Question

编辑：如果我删除

RelatedItems

属性，问题就不存在。

创建实体类型

PlayerFurnitureItemPlacementData

的记录后，它会尝试使用不存在的列进行插入。

生成签名：

INSERT INTO `player_furniture_item_placement_data` (`created_at`, `direction`, `player_furniture_item_id`, `player_furniture_item_wired_data_id`, `position_x`, `position_y`, `position_z`, `room_id`, `wall_position`)

player_furniture_item_wired_data_id

从来不存在，EF从哪里得到这个？

完整代码：

new PlayerFurnitureItemPlacementData
{
    RoomId = room.Id,
    PlayerFurnitureItemId = playerItem.Id,
    PlayerFurnitureItem = playerItem,
    PositionX = x,
    PositionY = y,
    PositionZ = z,
    WallPosition = string.Empty,
    Direction = (HDirection) direction,
    CreatedAt = DateTime.Now
};

dbContext.Entry(roomFurnitureItem.PlayerFurnitureItem).State = EntityState.Unchanged;
dbContext.RoomFurnitureItems.Add(roomFurnitureItem);

实体（如果不相关则被截断）：

public class PlayerFurnitureItemPlacementData
{
    [Key] public int Id { get; init; }
    public int PlayerFurnitureItemId { get; init; }
    public required PlayerFurnitureItem PlayerFurnitureItem { get; init; }
    public int RoomId { get; init; }
    public Room? Room { get; init; }
}

public class PlayerFurnitureItem
{
    public int Id { get; init; }
    public int PlayerId { get; set; }
    public Player? Player { get; set; }
    public FurnitureItem? FurnitureItem { get; init; }
    public PlayerFurnitureItemPlacementData? PlacementData { get; set; }
    public PlayerFurnitureItemWiredData? WiredData { get; set; }
    public DateTime CreatedAt { get; init; }
}

public class PlayerFurnitureItemWiredData
{
    [Key] public int Id { get; init; }
    public int PlayerFurnitureItemId { get; init; }
    public required PlayerFurnitureItem PlayerFurnitureItem { get; init; }
    public required ICollection<PlayerFurnitureItemPlacementData> RelatedItems { get; init; }
}

Answer 1

实体框架（EF）自动从导航属性及其相关实体构造外键和连接，因此通过显式定义，它应该可以解决问题。

PlayerFurnitureItemPlacementData class

public int? PlayerFurnitureItemWiredDataId { get; set; }
public PlayerFurnitureItemWiredData? PlayerFurnitureItemWiredData { get; set; }

在 OnModelBinding 方法上显式定义关系

modelBuilder.Entity<PlayerFurnitureItemPlacementData>()
    .HasOne(p => p.PlayerFurnitureItemWiredData)
    .WithMany(w => w.RelatedItems)
    .HasForeignKey(p => p.PlayerFurnitureItemWiredDataId);