如何修复缺少 1 个必需的位置参数"请求"错误？

Question

风险/风险集的类型错误get_context_data((缺少1个必需的位置参数："request"。

请参阅此处的代码：型号.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', on_delete=models.PROTECT, null = True)
parent_risk_set = models.ForeignKey('self', related_name="child_risk_set", on_delete=models.PROTECT, blank=True, 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

现在我得到错误：

TypeError at/risk/risksetget_context_data((缺少1个必需的位置参数："request">

请帮忙！

Answer 1

get_context_data不能使用request参数。您可以传递任意数量的参数，但在这里，您的get_context_data只有在与请求一起调用时才会运行。您使用self.request:访问请求

class RiskSet(SingleTableMixin, FormView):
template_name = "risk/RiskSet.html"
model = RiskSet
form_class = RiskSetForm

defget_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方法中这样做是没有意义的。FormView具有相应的例程。你可能还可以使用CreateView，它将删除更多的样板代码，比如：

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, *args, **kwargs):
context = super().get_context_data(*args, **kwargs)
# Add in a QuerySet of all the books
context['page'] = 'risk'
return context