Hello Baxter!
Take a look at my approach. It might help you. The following template
tag "load_obj" loads any object by id and saves passes it to the
template context variable:
# ---- code starts here ----
from django.db.models import get_model
from django import template
register = template.Library()
def do_load_obj(parser, token):
try:
# split_contents() knows not to split quoted strings.
tag_name, appmodel, object_id, str_as, var_name = token.split_contents()
except ValueError:
raise template.TemplateSyntaxError, "%r tag requires a
following syntax: {%% %r app.model <object_id> as <var_name> %%}" %
(token.contents[0], token.contents[0])
try:
appname, modelname = appmodel.split(".")
except ValueError:
raise template.TemplateSyntaxError, "%r tag requires
application name and model name separated by a dot" %
(token.contents[0], token.contents[0])
from django.conf import settings
model = get_model(appname, modelname)
return LoadObjNode(model, object_id, var_name)
class LoadObjNode(template.Node):
""" {% load_obj app.name <object_id> as <var_name> %} """
def __init__(self, model, object_id, var_name):
self.model = model
self.object_id = object_id
self.var_name = var_name
def render(self, context):
try:
object_id = template.resolve_variable(self.object_id, context)
obj = self.model.objects.get(pk=object_id)
except ValueError:
obj = None
context[self.var_name] = obj
return ''
register.tag('load_obj', do_load_obj)
# ---- code ends here ----
I think, this is a good example of both -- reading a value of a
variable in a template tag and also setting a value to the context
variable.
Regards,
Aidas Bendoraitis aka Archatas
On 2/9/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
>
> I need to pass a user id to a template tag.
> After reading this: http://groups.google.com/group/django-users/
> browse_thread/thread/96fe34b4561415dc/b7aba25f22bdd261?
> lnk=gst&q=template+tags+variable&rnum=1#b7aba25f22bdd261
>
> I came up with:
>
> class SongListNode(template.Node):
> def __init__(self, artist, varname):
> self.artist, self.varname = artist, varname
>
> def __repr__(self):
> return "<Song Node>"
>
> def render(self, context):
> artist=self.artist.resolve(context)
> context[self.varname] = Song.objects.filter(artist=artist)
> #context[self.varname] = [self.artist]
> return ''
>
> class DoGetSongList:
> """
> {% get_song_list as song_list %}
> """
> def __init__(self, tag_name):
> self.tag_name = tag_name
>
> def __call__(self, parser, token):
> bits = token.contents.split()
> if len(bits) != 4:
> raise template.TemplateSyntaxError, "'%s' tag takes three
> arguments" % bits[0]
> if bits[2] != "as":
> raise template.TemplateSyntaxError, "second argument to
> '%s' tag must be 'as'" % bits[0]
> #return SongListNode(bits[1], bits[3])
> return SongListNode(parser.compile_filter(bits[0]), bits[3])
> register.tag('get_song_list', DoGetSongList('get_song_list'))
>
>
> But no love. Suggestions?
>
>
> >
>
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