Django-NoReverseMatch初始化表单时，在创建视图中找不到任何参数

Question

我正在尝试使用一些作为参数传递的数据来初始化表单。我已经在模型中使用了[[get_absolute_url，但我不认为错误会这样，这是回溯：

Traceback (most recent call last):
  File "C:\Users\jorge.lopez\.virtualenvs\Carros-ZVuxKBiy\lib\site-packages\django\core\handlers\exception.py", line 34, in inner
    response = get_response(request)
  File "C:\Users\jorge.lopez\.virtualenvs\Carros-ZVuxKBiy\lib\site-packages\django\core\handlers\base.py", line 145, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "C:\Users\jorge.lopez\.virtualenvs\Carros-ZVuxKBiy\lib\site-packages\django\core\handlers\base.py", line 143, in _get_response
    response = response.render()
  File "C:\Users\jorge.lopez\.virtualenvs\Carros-ZVuxKBiy\lib\site-packages\django\template\response.py", line 105, in render
    self.content = self.rendered_content
  File "C:\Users\jorge.lopez\.virtualenvs\Carros-ZVuxKBiy\lib\site-packages\django\template\response.py", line 83, in rendered_content
    return template.render(context, self._request)
  File "C:\Users\jorge.lopez\.virtualenvs\Carros-ZVuxKBiy\lib\site-packages\django\template\backends\django.py", line 61, in render
    return self.template.render(context)
  File "C:\Users\jorge.lopez\.virtualenvs\Carros-ZVuxKBiy\lib\site-packages\django\template\base.py", line 171, in render
    return self._render(context)
  File "C:\Users\jorge.lopez\.virtualenvs\Carros-ZVuxKBiy\lib\site-packages\django\template\base.py", line 163, in _render
    return self.nodelist.render(context)
  File "C:\Users\jorge.lopez\.virtualenvs\Carros-ZVuxKBiy\lib\site-packages\django\template\base.py", line 936, in render
    bit = node.render_annotated(context)
  File "C:\Users\jorge.lopez\.virtualenvs\Carros-ZVuxKBiy\lib\site-packages\django\template\base.py", line 903, in render_annotated
    return self.render(context)
  File "C:\Users\jorge.lopez\.virtualenvs\Carros-ZVuxKBiy\lib\site-packages\django\template\loader_tags.py", line 150, in render
    return compiled_parent._render(context)
  File "C:\Users\jorge.lopez\.virtualenvs\Carros-ZVuxKBiy\lib\site-packages\django\template\base.py", line 163, in _render
    return self.nodelist.render(context)
  File "C:\Users\jorge.lopez\.virtualenvs\Carros-ZVuxKBiy\lib\site-packages\django\template\base.py", line 936, in render
    bit = node.render_annotated(context)
  File "C:\Users\jorge.lopez\.virtualenvs\Carros-ZVuxKBiy\lib\site-packages\django\template\base.py", line 903, in render_annotated
    return self.render(context)
  File "C:\Users\jorge.lopez\.virtualenvs\Carros-ZVuxKBiy\lib\site-packages\django\template\loader_tags.py", line 62, in render
    result = block.nodelist.render(context)
  File "C:\Users\jorge.lopez\.virtualenvs\Carros-ZVuxKBiy\lib\site-packages\django\template\base.py", line 936, in render
    bit = node.render_annotated(context)
  File "C:\Users\jorge.lopez\.virtualenvs\Carros-ZVuxKBiy\lib\site-packages\django\template\base.py", line 903, in render_annotated
    return self.render(context)
  File "C:\Users\jorge.lopez\.virtualenvs\Carros-ZVuxKBiy\lib\site-packages\django\template\defaulttags.py", line 443, in render
    url = reverse(view_name, args=args, kwargs=kwargs, current_app=current_app)
  File "C:\Users\jorge.lopez\.virtualenvs\Carros-ZVuxKBiy\lib\site-packages\django\urls\base.py", line 87, in reverse
    return iri_to_uri(resolver._reverse_with_prefix(view, prefix, *args, **kwargs))
  File "C:\Users\jorge.lopez\.virtualenvs\Carros-ZVuxKBiy\lib\site-packages\django\urls\resolvers.py", line 677, in _reverse_with_prefix
    raise NoReverseMatch(msg)

Exception Type: NoReverseMatch at /payments/addtoexistingweek/1/2020-W07
Exception Value: Reverse for 'pagoaexistente' with no arguments not found. 1 pattern(s) tried: ['payments/addtoexistingweek/(?P<carro>[0-9]+)/(?P<semana>[-a-zA-Z0-9_]+)$']

这是我获取参数的方式：
<a href={% url 'pagoaexistente' request.resolver_match.kwargs.carro request.resolver_match.kwargs.semana %}><button type="button" class="btn btn-primary" >

urls.py
path('payments/addtoexistingweek/<int:carro>/<slug:semana>',
         views.AgregarPagoSemana.as_view(), name='pagoaexistente'),

views.py
class AgregarPagoSemana(CreateView):

    template_name = "AC/add_paymentexistingweek.html"
    model = Pagos
    form_class = AgregarPagoTransaccionExistente

    def get_form_kwargs(self):
        kwargs = super(AgregarPagoSemana, self).get_form_kwargs()
        kwargs['carro'] = self.kwargs.get('carro')
        kwargs['semana'] = self.kwargs.get('semana')
        return kwargs

forms.py
class AgregarPagoTransaccionExistente(forms.ModelForm):

    def __init__(self, *args, **kwargs):
        self.carro = kwargs.pop('carro')
        self.semana = kwargs.pop('semana')
        super(AgregarPagoTransaccionExistente, self).__init__(*args, **kwargs)

    class Meta:
        model = Pagos
        fields = ('carro', 'pago', 'fecha', 'semana', 'renta')
        widgets = {'fecha': forms.DateInput(attrs={'type': 'date'}),
                   'semana': forms.DateInput(attrs={'type': 'week'})
                   }

如果没有发送参数，我不明白为什么会看到：
NoReverseMatch at /payments/addtoexistingweek/1/2020-W07

我在那里看到两个参数

Answer 1

<a href={% url 'pagoaexistente' request.resolver_match.kwargs.carro request.resolver_match.kwargs.semana %}><button type="button" class="btn btn-primary" >

此网址应包含关键字参数而不是位置参数。所以你可以做：
<a href={% url 'pagoaexistente' carro=request.resolver_match.kwargs.carro semana=request.resolver_match.kwargs.semana %}>

但是那真的很丑。我建议做的是从视图中暴露模板上下文中的carro和semana。这样可以避免request.resolver_match.kwargs烦人。
class AgregarPagoSemana(CreateView):
    ...
    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context.update({
            'semana': self.kwargs['semana'],
            'carro': self.kwargs['carro'],
        })
        return context

然后您的模板可以使用：
    <a href={% url 'pagoaexistente' carro=carro semana=semana %}>

如果要避免在视图上使用该额外方法，可以使用始终通过以下方式包含在上下文中的视图实例：
    <a href={% url 'pagoaexistente' carro=view.kwargs.carro semana=view.kwargs.semana %}>