如何更新views.py中模型的值？

Question

早安各位，

我是 django 新手，想问你以下问题。

我在models.py中有两个类：

class Single_Income(models.Model):

  income_label = models.CharField(max_length=100, editable=True)

  income_jan = MoneyField(decimal_places=2,default=0, default_currency='EUR',max_digits=11)
  income_feb= MoneyField(decimal_places=2,default=0, default_currency='EUR',max_digits=11)



class Total_Income(models.Model):

  total_jan = MoneyField(decimal_places=2,default=0, default_currency='EUR',max_digits=11)
  total_feb= MoneyField(decimal_places=2,default=0, default_currency='EUR',max_digits=11)

在视图中我有以下代码：

def ricavi_dalle_vendite(request):
    items = Single_Income.objects.all()
    if request.method == 'POST':
         form = SingleIncomeModelForm(request.POST)
         if form.is_valid():
             print("Il form è valido")
             new_input = form.save()

    else :
        form = SingleIncomeModelForm()

    context= {
        "form": form,
        'items': items,
            }
    return render(request, "app/income.html", context) 

因此，在 web_application（url “app/income.html”）中填写表格，就可以填写 Single_Income。现在我想以这种方式自动填充 Total_Income 模型（在保存 Single_Income 模型数据之后）：

单身收入：

---

|____一月____|___工厂_____|

|____100___|_____100____|

|____100____|____100____|

总收入：

---

|____200____|____200____|

Answer 1

您可以通过调用Total_Income 来创建Total_Income 的实例。举个例子：

from . models import Total_Income, Single_Income
from django.db.models import Sum

def ricavi_dalle_vendite(request):
    items = Single_Income.objects.all()

    if request.method == 'POST':
         form = SingleIncomeModelForm(request.POST)
         if form.is_valid():
             print("Il form è valido")
             new_input = form.save()

             # get sums of income_jan and income_feb for all records in Single_Income
             data_jan = Single_Income.objects.aggregate(Sum('income_jan'))
             data_feb = Single_Income.objects.aggregate(Sum('income_feb'))
             jan = data_jan['income_jan__sum']
             feb = data_jan['income_feb__sum']

             # or, sum the incomes from the form
             data_jan = new_input.aggregate(Sum('income_jan'))
             data_feb = new_input.aggregate(Sum('income_feb'))
             jan = data_jan['income_jan__sum']
             feb = data_jan['income_feb__sum'] 

             # create a Total_Income instance
             total_income = Total_Income(total_jan=jan, total_feb=feb)
             # you must save the instance after creating it if you want it to persist
             total_income.save() 

             context= {
               "form": form,
               'items': items,
               'total_income': total_income
             }

    return render(request, "app/income.html", context) 

现在您可以在模板中访问 total_income，就像访问 items 一样。