我有一个模型的表单，该表单跟踪输入/离开时间。我正在尝试添加约束以使数据更准确。当前，当有人“输入”时，它将创建一条记录，将时间保存在“ time_in” DateTimeField中，然后进行重定向。如果此人然后尝试再次输入，它将创建带有新时间戳记的新记录。
我现在要添加的是，如果此人的上一个条目没有退出时间戳（time_out），则该记录（将是倒数第二个最近的条目）将通过更新 time_exceptions 字段设置为“ N”。
当前，无论是否存在出口，它都会将所有字段都更改为“ N”，如下所示。
注意，我减少了form_valid中的代码量，因此请假区域不存在。只是基于其他字段的大量筛选，而且似乎不太相关。
views.py
class EnterExitArea(CreateView):
model = EmployeeWorkAreaLog
template_name = "operations/enter_exit_area.html"
form_class = WarehouseForm
def form_valid(self,form):
emp_num = form.cleaned_data['employee_number']
area = form.cleaned_data['work_area']
station = form.cleaned_data['station_number']
if 'enter_area' in self.request.POST:
form.save()
EmployeeWorkAreaLog.objects.filter((Q(employee_number=emp_num) & Q(work_area=area) & Q(time_out__isnull=True) & Q(time_in__isnull=True)) & (Q(station_number=station) | Q(station_number__isnull=True))).update(time_in=datetime.now())
if EmployeeWorkAreaLog.objects.filter(Q(employee_number=emp_num)).count() > 1:
EmployeeWorkAreaLog.objects.filter((Q(employee_number=emp_num) & Q(work_area=area) & Q(time_out__isnull=True)) & (Q(station_number=station) | Q(station_number__isnull=True))).update(time_exceptions='N')
return HttpResponseRedirect(self.request.path_info)
我尝试了以下操作，但是得到了expected string or bytes-like object，尽管它在崩溃前仍会创建一条新记录，但它不会将第二个的time_exceptions更新为N。
if 'enter_area' in self.request.POST:
form.save()
EmployeeWorkAreaLog.objects.filter((Q(employee_number=emp_num) & Q(work_area=area) & Q(time_out__isnull=True) & Q(time_in__isnull=True)) & (Q(station_number=station) | Q(station_number__isnull=True))).update(time_in=datetime.now())
if EmployeeWorkAreaLog.objects.filter(Q(employee_number=emp_num) & Q(time_out__isnull=True) & Q(time_exceptions="")).count() > 1:
recent = EmployeeWorkAreaLog.objects.filter(employee_number=emp_num,work_area=area,station_number=station,time_out__isnull=True).order_by('-time_in')[1]
EmployeeWorkAreaLog.objects.filter((Q(employee_number=emp_num) & Q(work_area=area) & Q(time_in=recent) & Q(time_out__isnull=True)) & (Q(station_number=station) | Q(station_number__isnull=True))).update(time_exceptions='N')
return HttpResponseRedirect(self.request.path_info)
models.py
class EmployeeWorkAreaLog(TimeStampedmodel,SoftDeleteModel,models.Model):
employee_number = models.ForeignKey(Salesman,on_delete=models.SET_NULL,help_text="Employee #",null=True,blank=False)
work_area = models.ForeignKey(WorkArea,blank=False,help_text="Work Area",related_name="work_area")
station_number = models.ForeignKey(StationNumber,time_exceptions = models.CharField(max_length=2,blank=True)
time_in = models.DateTimeField(help_text="Time in",blank=True)
time_out = models.DateTimeField(blank=True,help_text="Time out",null=True)
def __str__(self):
return self.employee_number
回溯：
Internal Server Error: /operations/enter-exit-area/
Traceback (most recent call last):
File "C:\Users\mkusneco\appsve\lib\site-packages\django\core\handlers\exception.py",line 34,in inner
response = get_response(request)
File "C:\Users\mkusneco\appsve\lib\site-packages\django\core\handlers\base.py",line 126,in _get_response
response = self.process_exception_by_middleware(e,request)
File "C:\Users\mkusneco\appsve\lib\site-packages\django\core\handlers\base.py",line 124,in _get_response
response = wrapped_callback(request,*callback_args,**callback_kwargs)
File "C:\Users\mkusneco\appsve\lib\site-packages\django\views\generic\base.py",line 68,in view
return self.dispatch(request,*args,**kwargs)
File "C:\Users\mkusneco\appsve\lib\site-packages\django\views\generic\base.py",line 88,in dispatch
return handler(request,**kwargs)
File "C:\Users\mkusneco\appsve\lib\site-packages\django\views\generic\edit.py",line 172,in post
return super().post(request,line 142,in post
return self.form_valid(form)
File "C:\Users\mkusneco\apps.rsrgroup.com\apps\operations\views.py",line 45,in form_valid
Q(station_number=station) | Q(station_number__isnull=True))).update(time_exceptions='N')
File "C:\Users\mkusneco\appsve\lib\site-packages\django\db\models\manager.py",line 82,in manager_method
return getattr(self.get_queryset(),name)(*args,**kwargs)
File "C:\Users\mkusneco\appsve\lib\site-packages\django\db\models\query.py",line 844,in filter
return self._filter_or_exclude(False,line 862,in _filter_or_exclude
clone.query.add_q(Q(*args,**kwargs))
File "C:\Users\mkusneco\appsve\lib\site-packages\django\db\models\sql\query.py",line 1263,in add_q
clause,_ = self._add_q(q_object,self.used_aliases)
File "C:\Users\mkusneco\appsve\lib\site-packages\django\db\models\sql\query.py",line 1281,in _add_q
current_negated,allow_joins,split_subq)
File "C:\Users\mkusneco\appsve\lib\site-packages\django\db\models\sql\query.py",line 1287,in _add_q
split_subq=split_subq,File "C:\Users\mkusneco\appsve\lib\site-packages\django\db\models\sql\query.py",line 1225,in build_filter
condition = self.build_lookup(lookups,col,value)
File "C:\Users\mkusneco\appsve\lib\site-packages\django\db\models\sql\query.py",line 1096,in build_lookup
lookup = lookup_class(lhs,rhs)
File "C:\Users\mkusneco\appsve\lib\site-packages\django\db\models\lookups.py",line 20,in __init__
self.rhs = self.get_prep_lookup()
File "C:\Users\mkusneco\appsve\lib\site-packages\django\db\models\lookups.py",line 70,in get_prep_lookup
return self.lhs.output_field.get_prep_value(self.rhs)
File "C:\Users\mkusneco\appsve\lib\site-packages\django\db\models\fields\__init__.py",line 1408,in get_prep_value
value = super().get_prep_value(value)
File "C:\Users\mkusneco\appsve\lib\site-packages\django\db\models\fields\__init__.py",line 1268,in get_prep_value
return self.to_python(value)
File "C:\Users\mkusneco\appsve\lib\site-packages\django\db\models\fields\__init__.py",line 1369,in to_python
parsed = parse_datetime(value)
File "C:\Users\mkusneco\appsve\lib\site-packages\django\utils\dateparse.py",line 106,in parse_datetime
match = datetime_re.match(value)
TypeError: expected string or bytes-like object