fix: datetime引用出错

apps/wpm/services.py

@@ -2,7 +2,6 @@ import datetime
 
 from django.core.cache import cache
 from django.db.models import Sum
-from datetime import datetime
 from django.utils import timezone
 from typing import Union
 from django.core.exceptions import ObjectDoesNotExist, MultipleObjectsReturned
@@ -119,7 +118,7 @@ def do_in(mio: MIO):
                 raise ParseError('车间物料不足')
 
 
-def mlog_submit(mlog: Mlog, user: User, now: Union[datetime, None]):
+def mlog_submit(mlog: Mlog, user: User, now: Union[datetime.datetime, None]):
     """
     生产日志提交后需要执行的操作
     """