Thanks, good info. So the template tag can do the DB query and all
that without going through a view function?
On Jun 15, 8:09 am, Paul <pkoe...@gmail.com> wrote:
> On 15 Jun., 06:55, Joel Klabo <joelkl...@gmail.com> wrote:
>
> > I am working on a simple site right now and the views are pretty easy.
> > Usually just iterate a loop of objects. But, I am trying to figure out
> > how a website with all different kinds of data, including a sign in
> > form, is setup in django. Is that all in one big view? Or, is there
> > some way to combine them?
>
> > Any insight would be helpful, thank you.
>
> Hi Joel,
>
> very good question, I take it you want to know how "composition" is
> done at the "page level" without dragging all the logic into one view.
> In django you can generate recurring elements with template tags, for
> adding variables to the request or generate markup directly.
>
> say you want a list of users that joined your site recently:
>
> class RecentUsersNode(template.Node):
> def __init__(self, limit):
> try: self.limit = int(limit)
> except ValueError: self.limit = 10
>
> def render(self, context):
> profiles = UserProfile.objects.order_by('user__date_joined')
> [:self.limit]
> context['recent_users'] = profiles
> return ''
>
> @register.tag
> def recent_users(parser, token):
> args = token.split_contents()
> if len(args) <= 1:
> return RecentUsersNode(10)
>
> num = args[1]
> if(num[0] == num[-1] and num[0] in ('"', "'")):
> num = num[1:-1] # strip quotes
> return RecentUsersNode(num)
>
> {% recent_users %} will add a list of UserProfile objects to your
> request and you can use it like:
>
> {% for profile in recent_users %}
> <img src="{{ profile.photo.url }}" alt="{{ profile.desc }}" />
> {% endfor %}
>
> In the old days of web 1.0 there was a natural 1:1 mapping from the
> page to a script/function which generates the content. With ajax it's
> becoming more like a desktop app where you have many parts/widgets
> with callbacks or events. If you want the page to display without JS,
> you still have to generate the page with one request though...
>
> cheers
> Paul
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