在我的项目中，用户正在应用程序的设置页面中输入数据，并且应该使用用户的设置首选项更新数据库。我阅读了Alasdair的答案，以及如何使用__init__()可以访问用户的详细信息。我想知道是否可以从中返回数据，__init__()以便在调用save()视图中的函数之前可以验证输入的数据？这就是我尝试过的（但没有奏效）。我愿意以更好的方式来解决这个问题，因此，我感谢您的所有建议！
**编辑：**我决定移动对用户在表单文件中输入的数据的验证，因为当我在视图中编写数据时，最终得到5条if语句（嵌套）。IMO，考虑到此应用程序的情况，将其移至表格似乎是一种更清洁的方法。我也考虑过使用clean _ ['field']，但是我需要函数中的side变量__init__()来做到这一点，而且我不确定如何提取该值。
class t_max_form(forms.ModelForm):
side = None
def __init__(self, *args, **kwargs):
side = kwargs.pop('side', None)
super(t_max_form, self).__init__(*args,**kwargs)
if side == "ms":
self.fields['hs_max_sessions'].widget.attrs.update({'class':'form-control', 'readonly':True})
self.fields['ms_max_sessions'].widget.attrs.update({'class':'form-control mb-3'})
elif side == "hs":
self.fields['hs_max_sessions'].widget.attrs.update({'class':'form-control'})
self.fields['ms_max_sessions'].widget.attrs.update({'class':'form-control', 'readonly':True})
else:
self.fields['hs_max_sessions'].widget.attrs.update({'class':'form-control'})
self.fields['ms_max_sessions'].widget.attrs.update({'class':'form-control'})
#Trying to validate the data here
valid_session_count = settings.objects.first()
if(side == "ms"):
input_sessions = self.fields['ms_max_sessions'].widget.attrs['readonly']
if(input_sessions > valid_session_count.max_sessions):
self.add_error("ms_max_sessions", "You have entered more than the limit set by the TC. Try again")
elif(side == "hs"):
input_sessions = self.cleaned_data['hs_max_sessions']
if(input_sessions > valid_session_count.max_sessions):
self.add_error("hs_max_sessions", "You have entered more than the limit set by the TC. Try again")
else:
input_sessions = self.cleaned_data['ms_max_sessions'] + self.cleaned_data['hs_max_sessions']
if(input_sessions > valid_session_count.max_sessions):
self.add_error("hs_max_sessions", "You have entered more than the limit set by the TC. Try again")
return input_sessions
这就是我在尝试的观点
def t_time_slots(request):
name = request.user.username
t = t_info.objects.get(student__user__username = name)
timeSlots = tutor_time_slot.objects.filter(tutor = tutor).order_by('time')
side = decide_side(request.user)
if request.method == 'POST':
form = t_time_slot_form(request.POST)
if form.is_valid():
if check_unique_time_slot(request.user, form.cleaned_data['day'], form.cleaned_data['time']):
timeSlots = form.save(commit=False)
timeSlots.t = t
timeSlots.save()
messages.success(request, "Added Successfully")
return redirect('TTimeSlot')
else:
print("Overlap")
messages.error(request, "The time slot overlaps with a Current one. Please Change the time and try again.")
return redirect('TTimeSlot')
else:
form = t_time_slot_form()
context = {'timeSlots': timeSlots, 'form': form, 'side':side}
return render(request, 't/t_time_slot.html', context)
self.side在__init__方法中进行设置，然后可以在clean()或clean_<field>方法中进行访问。
我会避免将验证代码放入__init__方法中。
class MyForm(forms.Form):
my_field = forms.CharField()
def __init__(self, *args, **kwargs):
self.side = kwargs.pop('side', None)
super(t_max_form, self).__init__(*args,**kwargs)
...
def clean_my_field(self):
my_field = self.cleaned_data['my_field']
# Use self.side to validate data
if my_field = self.side:
raise forms.ValidationError("Invalid")
return my_field
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我来说两句