python - 使用 Django 存款金额

Question

模型.py

客户类(models.Model):

user = models.ForeignKey(User, on_delete=models.CASCADE)

contact = models.BigIntegerField(unique=True)

amount = models.BigIntegerField()

type = models.CharField(max_length=1)`

表单.py

类 Deposit_Form(forms.Form):

amount = forms.IntegerField(min_value=200, label="Enter amount u want to deposit")

查看.py

类Log_in(TemplateView):

template_name = 'login.html'

def get(self, request, *args, **kwargs):

    Form = Login()

    return render(request, self.template_name, {'form': Form})

def post(self, request):

    username = self.request.POST.get('username').strip()

    password = self.request.POST.get('password').strip()

    if username is None or password is None:

        return HttpResponse({'Doesnt exist'}, status=HTTP_400_BAD_REQUEST)

    user = authenticate(username=username, password=password)

    if not user:

        return HttpResponse({'Invalid candidate '}, status=HTTP_404_NOT_FOUND)

    return redirect('customer_menu')

def customer_menu(请求):

if "user_id" in request.session:

    return render(request, 'customer_menu.html')

存款类(TemplateView):

template_name = 'deposit.html'

def get(self, request, *args, **kwargs):

    Form = Deposit_Form()

    return render(request, self.template_name, {'form': Form})

@staticmethod

def post(request):

    if "user_id" in request.session:

        data = request.POST.get

        try:

            deposit_amount=data('deposit_amount')

            customer = CustomerModel(

                amount = deposit_amount+amount
            )
            customer.save()

            return HttpResponse('action performed successfully', 500)

        except Exception as e:

            return HttpResponse("failed : {}".format(e), 200)

现在我不明白如何存款金额，它在存款类后函数金额=存款金额+金额中显示错误

Answer 1

如果我正确理解您的问题，您希望增加客户模型上的金额字段。但首先您必须找到要更新的对象。而且您不能直接CustomerModel(amount=deposit_amount+amount)。 您可以使用 F() 函数来实现此目的。例如:CustomerModel.filter(pk=id).update(amount=F('amount')+deposite_amount)

您可以找到详细信息here有关 F() 函数的详细信息

编辑:另一种方法是，您可以使用 get() 方法找到您的 CustomerModel 对象并增加您的 amount 字段。之后，您可以保存您的对象。像这样:

customer = CustomerModel.objects.get(pk=id) #you can change query field
customer.amount = customer.amount + data('deposite_amount')
customer.save()