Django url parameter and reverse URL

Question

I have a view that looks like this:

def selectCity(request, the_city):
    request.session["ciudad"] = the_city
    city = request.session["ciudad"]
    return HttpResponse('Ciudad has been set' + ": " + city)

And a URL that looks like this:

url(r'^set/$', views.selectCity, {'the_city': 'gye'}, name='ciudad'),

Now when I visit /set/ I get the appropriate response with the session variable set from the value on the dict in the url {'the_city': 'gye'}

Now, what I would like to do is modify my program so that I can call the 'ciudad' url from a different template (index.html) and set the appropriate session variable. So I would call it using reverse URL matching with an additional argument doing something like this:

  <div class="modal-body">
      <a tabindex="-1" href="{% url ciudad 'the_city':'uio' %}">Quito</a>
      <br/>
      <a tabindex="-1" href="{% url ciudad 'the_city':'gye' %}">Guayaquil</a>
  </div>

I have tried to modify the url and the views and the reverse url call in various ways to try to get this to work but, I can't seem to figure it out. I would really appreciate some pointers.

Aamir Rind · Accepted Answer · 2012-12-18 18:18:00Z

14

You can pass the relevant arguments in url tag, if your url (in urls.py) has any capturing group.

url(r'^set/(?P<the_city>\w+)/$', views.selectCity, {'the_city': 'gye'}, name='ciudad'),

Then in template:

<a tabindex="-1" href="{% url ciudad the_city='gye' %}">Guayaquil</a>

edited Dec 18, 2012 at 18:18

answered Dec 18, 2012 at 17:53

Aamir Rind

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2 Comments

edu222 Over a year ago

Yup, this is perfect,thanks! A quick question, what does that \w+ part or the regular expression do?

Aamir Rind Over a year ago

Please see here, \w+ means it matches any alphanumeric character and the underscore; this is equivalent to the set [a-zA-Z0-9_]

msc · Accepted Answer · 2012-12-18 17:52:25Z

1

Check out captured parameters. Something like this might work:

url(r'^set/$', views.selectCity, {'the_city': 'gye'}, name='ciudad'),
url(r'^set/(?P<the_city>\w+)/$', views.selectCity, name='ciudad'),

answered Dec 18, 2012 at 17:52

msc

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