处理挂单测试问题

web/App_Code/api/regionRoomController.cs

@@ -38,6 +38,15 @@ public class regionRoomController : ApiController
         {
             return BadRequest("請輸入床位數量");
         }
+        var region = _db.Region.Find(room.RegionUuid);
+        if(region == null)
+        {
+            return BadRequest("未找到客房所屬的區域");
+        }
+        if(region.Room.Count() >= region.RoomCount)
+        {
+            return BadRequest("當前區域客房數量已經達到上限");
+        }
         var newRoom = new Room();
         newRoom.Name = room.Name;
         newRoom.RegionUuid = room.RegionUuid;
@@ -103,15 +112,43 @@ public class regionRoomController : ApiController
     [Route("api/region/room/delete")]
     public async Task<IHttpActionResult> deleteRoom([FromBody] Room rm)
     {
-        var room = await _db.Room.FindAsync(rm.Uuid);
-        if (room == null) return BadRequest("房間不存在");
+        using (var transaction = _db.Database.BeginTransaction())
+        {
+            try
+            {
+                var room = await _db.Room.FindAsync(rm.Uuid);
+                if (room == null) return BadRequest("房間不存在");
 
-        var beds = _db.RegionRoomBed.Where(b => b.RoomUuid == room.Uuid);
-        _db.RegionRoomBed.RemoveRange(beds);
+                var beds = _db.RegionRoomBed.Where(b => b.RoomUuid == room.Uuid);
+                _db.RegionRoomBed.RemoveRange(beds);
 
-        _db.Room.Remove(room);
-        await _db.SaveChangesAsync();
-        return Ok(new { message = "刪除成功" });
+                _db.Room.Remove(room);
+
+                await _db.SaveChangesAsync();
+                transaction.Commit();
+
+                return Ok(new { message = "刪除成功" });
+            }
+            catch (System.Data.Entity.Infrastructure.DbUpdateException ex)
+            {
+                transaction.Rollback();
+
+                // 判断是否为外键约束错误
+                if (ex.InnerException?.InnerException is System.Data.SqlClient.SqlException sqlEx &&
+                    sqlEx.Number == 547) // 547 = 外键冲突
+                {
+                    return BadRequest("房間或床位正在被使用，不能刪除");
+                }
+
+                return InternalServerError(ex);
+            }
+            catch (Exception ex)
+            {
+                transaction.Rollback();
+                return InternalServerError(ex);
+            }
+        }
     }
 
+
 }