如何修复缺少 1 个必需的位置参数“请求”错误？

如何解决如何修复缺少 1 个必需的位置参数“请求”错误？

类型错误在 /risk/riskset get_context_data() 缺少 1 个必需的位置参数：“请求”。

在此处查看代码： 模型.py

class RiskSet(models.Model):
    name = models.CharField('Risk set',max_length=500,blank=True,default = '')
    owner = models.ForeignKey(User,verbose_name = 'owner',on_delete=models.PROTECT,null=True)
    risk = models.ForeignKey(Risk,verbose_name = 'risk',null = True)
    parent_risk_set = models.ForeignKey('self',related_name="child_risk_set",null=True)
  
    def __str__(self):
        return "{}".format(self.name)

forms.py

class RiskSetForm(forms.ModelForm):
    RiskID1 = forms.ModelMultipleChoiceField(queryset=Risk.objects.all(),required=True,widget=forms.SelectMultiple(attrs={'class': 'select2'}),label = 'Risk id')
                                                         
    def __init__(self,*args,**kwargs):
        super(RiskSetForm,self).__init__(*args,**kwargs)
        print(self)
        for visible in self.visible_fields():
            visible.field.widget.attrs['class'] = 'form-control'

    class Meta:
        model = RiskSet
        fields = ['name','owner','risk','parent_risk_set']

views.py

class RiskSet(FormView,SingleTableMixin):
    template_name = "risk/RiskSet.html"
    model = RiskSet
    form_class = RiskSetForm
    def get_context_data(self,request):
        form = RiskSetForm(request.POST or None)
        if form.is_valid():
            form.save()    
        # Call the base implementation first to get a context
        context = super().get_context_data(**kwargs)
        # Add in a QuerySet of all the books
        context['page'] = 'risk'
        return context

现在出现错误：

类型错误在 /risk/riskset get_context_data() 缺少 1 个必需的位置参数：“请求”

请帮忙！

解决方法

get_context_data 与 request 参数不一起工作。您可以传递任意数量的参数，但此处您的 get_context_data 仅在随请求调用时才会运行。您使用 self.request 访问请求：

class RiskSet(SingleTableMixin,FormView):
    template_name = "risk/RiskSet.html"
    model = RiskSet
    form_class = RiskSetForm
    
    def get_context_data(self,*args,**kwargs):
        form = RiskSetForm(self.request.POST or None)
        if form.is_valid():
            form.save()    
        # Call the base implementation first to get a context
        context = super().get_context_data(*args,**kwargs)
        # Add in a QuerySet of all the books
        context['page'] = 'risk'
        return context

此外，在 get_context_data 方法中执行此操作毫无意义。 FormView 已为此设置了例程。您可能还可以使用 CreateView 来删除更多样板代码，例如：

from django.views.generic import CreateView

class RiskSet(SingleTableMixin,CreateView):
    template_name = "risk/RiskSet.html"
    model = RiskSet
    form_class = RiskSetForm
    success_url = 'path-to-url-when-form-is-valid'
    
    def get_context_data(self,**kwargs):
        context = super().get_context_data(*args,**kwargs)
        # Add in a QuerySet of all the books
        context['page'] = 'risk'
        return context