python - 如何通过Django中的表单向整数字段添加值？

Question

我目前正在尝试制作一个表单，将值添加到我创建的“点”模型中，但它似乎没有通过。我制作了一个表格，它应该允许用户输入任何整数值，并且它应该添加(或减去)到模型中。任何人都可以指出我该怎么做的正确方向吗？任何帮助表示赞赏。

这是我的forms.py:

class addpointForm(forms.ModelForm):
    add_point_field = forms.IntegerField(widget=forms.NumberInput)
    class Meta:
        model = Points
        fields = ['user']

模型.py:

class Points(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    points = models.IntegerField(default=0, null=False)

    def __str__(self):
        return self.user.username

View .py:

@login_required
def pointform(request):
    if request.method=='POST':
        form = addpointForm(request.POST)
        if form.is_valid():

            instance = form.save(commit=False)
            messages.success(request, 'Success! Points has been added!')
            instance.user.points += addpointForm.add_point_field
            form.save()
        else:
            messages.error(request, 'Oh no! There was an error when you were adding points!')

    form = addpointForm()
    return render (request,'users/addpoints.html',{'form':form})

Answer 1

将您的代码更改为:

instance.points += form.add_point_field
instance.save()

您实际上并没有使用用户的输入；相反，您不小心使用了 addpointForm.add_point_field .

在此期间，让我们更改一些其他内容以阐明您在做什么:

不要使用 ModelForm ;将您的表单类更改为继承自 forms.Form .这样做是因为您的表单实际上并没有修改模型；它只接受来自用户的输入，然后您接受并使用它来修改模型。在这种情况下，它使用 Form在我看来更惯用和直观:

class addpointForm(forms.Form):
    add_point_field = forms.IntegerField(widget=forms.NumberInput)

然后，让我们澄清和简化 View :

if request.method=='POST':
    form = addpointForm(request.POST)
    # Get the user from the request.
    user = request.user    

    if form.is_valid():
        points_instance = user.points
        points_instance.points += form.add_point_field
        points_instance.save()

        messages.success(request, 'Success! Points has been added!')

    else:
        messages.error(request, 'Oh no! There was an error when you were adding points!')

    form = addpointForm()

    return render (request,'users/addpoints.html',{'form':form})