Question

/ providers / 121 / update /的NoReverseMatch 反向＆＃39; provider_update＆＃39;有参数＆＃39;（无，）＆＃39;未找到。尝试了1种模式：[＆＃39;提供者/（？P \ d +）/更新/＆＃39;]

我知道为什么抛出NoReverseMatch错误，因为url无法找到被识别的参数。但是，我不明白为什么我的参数没有被传递到正确的视图。当我传递一个包含参数ID或PK的var时，由于某种原因，它将其识别为None。我查看了类似的问题，但是他们没有将数据传递给表单操作的问题。任何帮助表示赞赏!!感谢

partial_provider_update.html

<form method="post" action="{% url 'provider_update' form.instance.id %}" class="js-provider-update-form">
  {% csrf_token %}
  <div class="modal-header">
    <h4 class="modal-title">Update Provider</h4>
  </div>
  <div class="modal-body">
    {% include 'providers/includes/partial_provider_form.html' %}
  </div>
  <div class="modal-footer">
    <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
    <button type="submit" class="btn btn-primary">Update provider</button>
  </div>
</form>

partial_provider_list.html

      {% for provider in object_list %}
        <tr>
            <td>{{ provider.id }}</td>
            <td>{{ provider.name }}</td>
            <td>{{ provider.organization }}</td>
            <td>{{ provider.emr }}</td>
            <td>{{ provider.date|date:"Y-m-d" }}</td>
            <td style="width: 100px; vertical-align: center; padding-top: 9px">
                <button type="button"
                    style="height: 25px; font-size: 16px;width: 50px; padding: 0px"
                    class="btn btn-warning btn-sm js-update-provider"
                    data-url="{% url 'provider_update' provider.id %}">
                        Edit
                </button>
            </td>
         {% empty %}
            <tr>
              <td colspan="5" class="text-center bg-warning">No Providers</td>
            </tr>
         {% endfor %}

urls.py

from django.conf.urls import url, include
from django.views.generic import ListView, DetailView, TemplateView
from providers.models import Provider
from providers import views

urlpatterns = [
    url(r'^$', ListView.as_view(queryset=Provider.objects.all().order_by("id"), template_name='providers/home.html')),
    url(r'^create/', views.provider_create, name='provider_create'),
    url(r'^(?P<pk>\d+)/update/', views.provider_update, name='provider_update'),
]

views.py

# -*- coding: utf-8 -*-
from __future__ import unicode_literals
from django.shortcuts import render, get_object_or_404
from django.template.loader import render_to_string
from django.http import JsonResponse
from providers.models import Provider
from .forms import ProviderForm

def index(request):
    return render(request, 'providers/home.html')

def save_provider_form(request, form, template_name):
    data = dict()
    if request.method == 'POST':    
        if form.is_valid():
            form.save()
            data['form_is_valid'] = True
            object_list = Provider.objects.all()
            data['html_provider_list'] = render_to_string('providers/includes/partial_provider_list.html', { 'object_list' : object_list })
        else:
            data['form_is_valid'] = False
    else:
        form = ProviderForm()
    context = {'form': form}
    data['html_form'] = render_to_string(template_name, context, request=request)
    return JsonResponse(data)

def provider_create(request):
    if request.method == 'POST':
        form = ProviderForm(request.POST)
    else:
        form = ProviderForm()
    return save_provider_form(request, form, 'providers/includes/partial_provider_create.html')

def provider_update(request, pk):
    provider = get_object_or_404(Provider, pk=pk)
    if request.method == 'POST':
        form = ProviderForm(request.POST, instance=provider)
    else:
        form = ProviderForm(instance=provider)
    return save_provider_form(request, form, 'providers/includes/partial_provider_update.html')

Answer 1

问题出在save_provider_form()函数中。

请参阅以下代码中的评论：

def save_provider_form(...):

    if request.method == 'POST':    
        ...
        else:
            ...
    else:
        # ################### #
        # HERE IS THE PROBLEM #
        # ################### #
        form = ProviderForm() # form is re-initialized with no instance

如果provider_update()为request.method，则在GET函数中，您正在使用instance初始化表单，但save_provider_form()如果request.method是GET，您正在重新初始化没有实例的表单。因此，id为None，因为该实例为None。

NoReverseMatch在将数据源传递给表单操作方法时遇到困难

1 个答案: