python - 在 Django 项目中修复无反向匹配
问题描述
我收到以下错误:Reverse for 'order_pdf' with arguments '('',)' not found. 1 pattern(s) tried: ['business_plan/(?P<id>[0-9]+)/pdf/$']
我不确定到底是什么原因。
这是模型:
class Info(models.Model):
logo = models.ImageField(default='report-cover.jpg', null=True, blank=True)
date_posted = models.DateTimeField(default=timezone.now)
name = models.CharField(null=True, blank=True, max_length=100)
这是views.py
def add_business_plan(request):
# info=Info.objects.all()
if request.method == 'POST':
# create a form instance and populate it with data from the request:
form = infoForm(request.POST)
# check whether it's valid:
if form.is_valid():
form.save()
business_name = form.cleaned_data.get('businessName')
messages.success(request, f'PDF created for {business_name}!')
# return redirect('businessplan:businessplan')
# redirect(reverse('businessplan:businessplan', kwargs={'successful_submit': True}))
return render(request, 'businessplan/businessplan.html', {'successful_submit': True})
# if a GET (or any other method) we'll create a blank form
else:
form = infoForm()
print(form.errors)
return render(request, 'businessplan/businessplan.html', {'form': form, 'successful_submit': False,
# "Info": info
})
def order_pdf(request, info_id):
info = get_object_or_404(Info, id=info_id)
html = render_to_string('businessplan/pdf.html', {'info': info})
response = HttpResponse(content_type='application/pdf')
response['Content-Disposition'] = 'attachment; filename="{}-Business Plan.pdf"'.format(info.businessName)
weasyprint.HTML(string=html, base_url=request.build_absolute_uri()).write_pdf(response,
stylesheets=[weasyprint.CSS(settings.STATICFILES_DIRS[0] + '\css\\report.css')], presentational_hints=True)
return response
def admin_order_pdf(request, info_id):
info = get_object_or_404(Info, id=info_id)
html = render_to_string('businessplan/pdf.html', {'info': info})
response = HttpResponse(content_type='application/pdf')
response['Content-Disposition'] = 'filename="{}-Business Plan.pdf"'.format(info.businessName)
weasyprint.HTML(string=html, base_url=request.build_absolute_uri()).write_pdf(response,
stylesheets=[weasyprint.CSS(settings.STATICFILES_DIRS[0] + '\css\\report.css')], presentational_hints=True)
return response
这是 urls.py
urlpatterns = [
path('', add_business_plan, name='businessplan'),
path('businessplan/admin/info/<str:info_id>/pdf/', admin_order_pdf, name='admin_order_pdf'),
#path('<str:info_id>/pdf/', admin_order_pdf, name='admin_order_pdf'),
path('<str:info_id>/pdf/', order_pdf, name='order_pdf'),
]
这是模板的 businessplan.html 片段:
....modal divs
<a href="{% url 'businessplan:order_pdf' Info.id %}">
<!--<a href="{% url 'businessplan:order_pdf' obj.id %}">-->
<!--<a href="{% url 'businessplan:order_pdf' Info.info_id %}">-->
....modal divs
<form class="needs-validation" method="post" novalidate enctype="multipart/form-data">
{% csrf_token %}
<div class="form-outline mb-4 mt-3">
<input required autocomplete="off" type="text" class="form-control" name=" name"
{% if form.is_bound %} value= "{{ form.name.value }}" {% endif %}>
<label class="form-label">Name</label>
</div>
{% for err in form.name.errors %}
<small class="text-danger ml-2">{{ err }}</small>
{% endfor %}
</div>
</form>
{% if successful_submit %}
<script type="text/javascript">
$(document).ready(function(){
$("#exampleModal").modal('show');
});
</script>
{% endif %}
我可以从管理员访问 pdf,但我正在尝试访问以添加此按钮以获得更简单的功能。
我试过改变info_id
它id
没有用。
这个错误的原因是什么?
这是回溯:
Internal Server Error: /business_plan/
Traceback (most recent call last):
File "C:\Users\User\Desktop\Portfolio\venv\lib\site-packages\django\core\handlers\exception.py", line 47, in inner
response = get_response(request)
File "C:\Users\User\Desktop\Portfolio\venv\lib\site-packages\django\core\handlers\base.py", line 179, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\Users\User\Desktop\Portfolio\businessplan\views.py", line 30, in add_business_plan
return render(request, 'businessplan/businessplan.html', {'form': form, 'successful_submit': False })
File "C:\Users\User\Desktop\Portfolio\venv\lib\site-packages\django\shortcuts.py", line 19, in render
content = loader.render_to_string(template_name, context, request, using=using)
File "C:\Users\User\Desktop\Portfolio\venv\lib\site-packages\django\template\loader.py", line 62, in render_to_string
return template.render(context, request)
File "C:\Users\User\Desktop\Portfolio\venv\lib\site-packages\django\template\backends\django.py", line 61, in render
return self.template.render(context)
File "C:\Users\User\Desktop\Portfolio\venv\lib\site-packages\django\template\base.py", line 170, in render
return self._render(context)
File "C:\Users\User\Desktop\Portfolio\venv\lib\site-packages\django\template\base.py", line 162, in _render
return self.nodelist.render(context)
File "C:\Users\User\Desktop\Portfolio\venv\lib\site-packages\django\template\base.py", line 938, in render
bit = node.render_annotated(context)
File "C:\Users\User\Desktop\Portfolio\venv\lib\site-packages\django\template\base.py", line 905, in render_annotated
return self.render(context)
File "C:\Users\User\Desktop\Portfolio\venv\lib\site-packages\django\template\defaulttags.py", line 446, in render
url = reverse(view_name, args=args, kwargs=kwargs, current_app=current_app)
File "C:\Users\User\Desktop\Portfolio\venv\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\User\Desktop\Portfolio\venv\lib\site-packages\django\urls\resolvers.py", line 685, in _reverse_with_prefix
raise NoReverseMatch(msg)
django.urls.exceptions.NoReverseMatch: Reverse for 'order_pdf' with arguments '('',)' not found. 1 pattern(s) tried: ['business_plan/(?P<info_id>[^/]+)/pdf/$']
[10/Oct/2021 06:58:51] "GET /business_plan/ HTTP/1.1" 500 143694
解决方案
看起来<a href="{% url 'businessplan:order_pdf' Info.id %}">
不起作用,因为您没有将它传递给模板上下文。
结果,调用失败,因为Info.id
是一个空字符串(参见https://docs.djangoproject.com/en/3.2/ref/templates/api/#invalid-template-variables),因此破坏了 URL 反转逻辑。
您应该将您的信息实例传递给模板上下文以使其工作,例如:
return render(
request,
'businessplan/businessplan.html',
{
'form': form,
'successful_submit': False,
"Info": info_instance
}
)
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