Learning Django by Example(7) Attach a tag

Web January 20th, 2008

Tag is probably the most distinguish feature of Web 2.0 applications that differentiate them from the traditional hierarchy categories. I want to attach a Web 2.0 tag to Gelman, so the user could simply click the tag, and find the related books that may arouse his/her interest.

django-taggingis a generic tag application to simplify the backend development, all you need to do is just add the TagField to the Book model:
class Book(models.Model):
……
tags = TagField()

And in the book_detail.html template, refer it as object.tags as this:

{{ object.tags|popuptags|safe }}

popuptags is a custom tag that decorates the tags as a list of HTML links, and join them:

@register.filter
def popuptags(value):
    tags = value.split(” “)
    return ” “.join([‘<a href="/bookshelf/tags/%s">%s</a>’ % (x, x) for x in tags])

So tag foo is linked with /bookshelf/tags/foo, so just redirect the request to the view:

(r‘^tags/(?P<tag_name>[\w-]+)/$’, views.by_tag)

And handle it in views.py:

@login_required
def by_tag(request, tag_name):
    tag = Tag.objects.get(name=tag_name)
    return list_detail.object_list(
        request,
        queryset=TaggedItem.objects.get_by_model(Book, tag),
        template_name=“bookshelf/book_list.html”,
        extra_context={‘title’: ‘Tagged by %s’ % tag_name},
    )

All the tedious work has been handled by django-tagging: we first get a tag object by name, and then build a QuerySet using get_by_model method; the rest is handled by the generic view, done. Salute to django-tagging developers!

We would discuss how to add a tag in the next post, that is the magic of Dojo.

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4 Comments to “Learning Django by Example(7) Attach a tag”

  1. tonni | January 20th, 2008 at 4:43 pm

    no wonder u r a codemonkey :p

  2. David Grant | January 21st, 2008 at 7:06 pm

    Thanks for this, I’m going to go home and do this right away. I have a TagField on one of my model’s but I haven’t really done anything with it yet.

  3. Mr.Michaels | February 15th, 2008 at 2:29 pm

    Very cool siteRefactor the Life » Blog Archive » Learning Django by Example(7) Attach a tag was an eye catcher. I will not hassle you by posting comments here often but I am quite sure I will come back and read this as often as possible. Perhaps you might be interested in some of the software that I write, being a website owner and all. This post was automatically submitted to wordpress by dpfriend. I just wanted to make a quick ten dollar offer for the program I am using. Go to your favorite search engine and type dpfriend and you can find me there. I accept paypal. Also if you need anything else automated please let me know.

  4. Earth4Energy | August 28th, 2008 at 6:41 am

    Really tags are boon to web 2.0

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