django - url with no argument to take a default value

Question

Suppose, this is an url which takes an argument (here, book_id) and pass the value to the views:

url(r'^/(?P<book_id>\w+)/$', 'pro.views.book', name='book'),

Is it possible for a url which takes an argument, but, if no argument is given, take a default value. If possible may be in the views too. I am sorry if this is a lame question, but I really need to know. Any help or suggestion will be grateful. Thank you

from documentation

alioguzhan
– alioguzhan

2013-12-02 00:25:05 +00:00
Commented Dec 2, 2013 at 0:25 — alioguzhan
– alioguzhan, Commented Dec 2, 2013 at 0:25
Should have looked into the docs. Thank you!

Aamu
– Aamu

2013-12-02 09:23:01 +00:00
Commented Dec 2, 2013 at 9:23 — Aamu
– Aamu, Commented Dec 2, 2013 at 9:23

Alasdair · Accepted Answer · 2013-12-02 00:22:58Z

13

Make the capturing pattern optional, and remember to deal with a trailing slash appropriately. I'd find a noncapturing group around the capturing group the safest way to do that:

url(r'^(?:(?P<book_id>\w+)/)?$', 'pro.views.book', name='book'),

Then in the views, declare a default for the argument:

def book(request, book_id='default'):

If you find that URL pattern ugly, you can bind two regexps to the same view function:

url(r'^(?P<book_id>\w+)/$', 'pro.views.book', name='book'),
url(r'^$', 'pro.views.book', name='default_book'),

Following Alasdair's reminder, I have removed the leading slash. I thought that looked odd.

edited Dec 2, 2013 at 0:22

Alasdair

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answered Dec 2, 2013 at 0:17

Peter DeGlopper

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3 Comments

Alasdair Over a year ago

+1 including both approaches, personally I much prefer two regexps

Peter DeGlopper Over a year ago

Yeah, I tend to use that approach myself - though that's partly just because I'm usually too lazy to refresh my memory on noncapturing group syntax.

Aamu Over a year ago

Woah! I would have never thought of that. Thank you so much!

Kordian Zadrożny · Accepted Answer · 2023-03-24 19:12:44Z

1

this very old topic but maybe someone want known hot to do this today.

First method is add in view default val: def someView(request, val1=0, val2=0):

and create two url paths to this view: path('myurl/',view.someView, name='someview'), path('myurl/int:val1/int:val2/',view.someView, name='someview),

Another methos is use in template link like this: href="{% url 'someView' %}?val1=1200"

and check in view is val1 exists if request.GET.get('val1'): doSomething

answered Mar 24, 2023 at 19:12

Kordian Zadrożny

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