django没有反向匹配错误，但是我有可选的视图参数

Question

I have the following link that is getting a "no reverse match" error: 我有以下链接出现“无反向匹配”错误：

<a href="{% url 'journals:entry' action='add'  day_number=journal.day_number  %}" >

My url looks like this: 我的网址看起来像这样：

url(r'^day/(?P<day_number>\d+)/(?P<action>add|edit|delete)/(?P<pk>\d+)/$', views.entry, name='entry'),

My view looks like this: 我的看法如下：

def entry(request, day_number=0, pk=None, action='add'):

I don't have a pk but I thought I don't need one since this param is optional. 我没有pk，但我想我不需要，因为此参数是可选的。

What am I doing wrong? 我究竟做错了什么？

Answer 1

You need to add pk argument. 您需要添加pk参数。

<a href="{% url 'journals:entry' action='add'  day_number=journal.day_number pk=... %}" >

If you want to make pk optional, modify the pattern as follow: 如果要使pk可选，请按照以下方式修改模式：

url(r'^day/(?P<day_number>\d+)/(?P<action>add|edit|delete)/(?P<pk>\d+)?/$',
    views.entry, name='entry'),