date error fix

assignment_service.py

@@ -139,48 +139,57 @@ class AssignmentService:
         else:
             user_assignments = self.get_user_assignments(assigner_data)
 
-
         for assignment_id, assignment_info in user_assignments.items():
             assignment_data = self.get_assignment(assignment_id)
             metadata = assignment_data.get("metadata", {})
-            if metadata:
-                topic = metadata.get("topic", "未命名作業")
-            else:
-                topic = "未命名作業"
+            topic = metadata.get("topic", "未命名作業") if metadata else "未命名作業"
             assignment_type = assignment_data.get("assignment_type", "未知類型")
             timestamp = assignment_data.get("timestamp", "未知日期")
             
             # 格式化日期
-            date = datetime.strptime(timestamp, "%Y-%m-%d %H:%M:%S").strftime("%Y-%m-%d")
+            if timestamp != "未知日期":
+                try:
+                    date = datetime.strptime(timestamp, "%Y-%m-%d %H:%M:%S").strftime("%Y-%m-%d")
+                except ValueError:
+                    date = "未知日期"
+            else:
+                date = "未知日期"
             
             # 創建格式化的選項
             formatted_choice = f"{date}|{assignment_type}|{topic}"
             choice = (formatted_choice, assignment_id)
             choices.append(choice)
         
-        # 按日期降序排序
-        choices.sort(key=lambda x: x[0].split("|")[0], reverse=True)
+        # 按日期降序排序，將"未知日期"放在最後
+        choices.sort(key=lambda x: (x[0].split("|")[0] == "未知日期", x[0].split("|")[0]), reverse=True)
         
         return gr.update(choices=choices)
     
 
     def delete_assignment(self, assignment_id, user_data):
         try:
-            # 刪除作業文件
+            # 首先檢查作業是否存在
             file_name = f"assignments/{assignment_id}.json"
-            if not self.gcs_service.delete_file(self.bucket_name, file_name):
-                raise Exception("Failed to delete assignment file")
+            if not self.gcs_service.check_file_exists(self.bucket_name, file_name):
+                print(f"警告：作業文件 {file_name} 不存在")
+            else:
+                # 如果文件存在，嘗試刪除
+                if not self.gcs_service.delete_file(self.bucket_name, file_name):
+                    print(f"警告：無法刪除作業文件 {file_name}")
 
-            # 從用戶的作業列表中刪
+            # 從用戶的作業列表中刪除
             user_assignments = self.get_user_assignments(user_data)
             if assignment_id in user_assignments:
                 del user_assignments[assignment_id]
                 encoded_user_id_url = urllib.parse.quote(user_data, safe='')
                 self.gcs_service.upload_json_string(self.bucket_name, f"users/{encoded_user_id_url}/assignments.json", json.dumps(user_assignments))
+                print(f"已從用戶 {user_data} 的作業列表中刪除作業 {assignment_id}")
+            else:
+                print(f"警告：作業 {assignment_id} 不在用戶 {user_data} 的作業列表中")
 
             return True
         except Exception as e:
-            print(f"Error deleting assignment: {e}")
+            print(f"刪除作業時發生錯誤：{e}")
             return False