Learning Django by Example(11) Attach a tag
django pythonTag 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-tagging is 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(['[%s](/bookshelf/tags/%s)' % (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[\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.