Add a couple more template tags like this and we'll have another
programming language :)
Actually, recently I was also thinking about creating some similar
tag: {% set object.whatever.whatever.property as variable %}
One thing that can be done for shortening access paths and for
temporary caching is creating methods for the objects, like this:
def get_related_property(self):
if not hasattr(self, '_related_property_cache'):
self._related_property_cache = self.whatever.whatever.property
return self._related_property_cache
Then instead of {{ object.whatever.whatever.property }}, you can use
{{ object.get_related_property }} and even if you do that multiple
times, the database is accessed only at the first time of accessing
the method.
Regards
Aidas Bendoraitis aka Archatas
On 3/22/07, akonsu <[EMAIL PROTECTED]> wrote:
>
> hello,
>
> thanks for posting.
>
> te way i do it is by creating a variable:
>
> {% let email = company.contact.email %}
>
> after that you can use email variable just like any other.
>
> konstantin
>
> class LetNode(Node) :
> def __init__(self, var, expr) :
> self.var, self.expr = var, expr
>
> def render(self, context) :
> try :
> context[self.var] = resolve_variable(self.expr, context)
> except VariableDoesNotExist :
> context[self.var] = None
> return ''
>
> LET_TAG_RE = re.compile(r'^\s*let\s+(\w+)\s*=\s*(\S+)\s*$')
>
> @register.tag
> def let(parser, token) :
> m = LET_TAG_RE.search(token.contents)
> if not m :
> raise TemplateSyntaxError, 'invalid syntax'
> return LetNode(*m.groups())
>
>
> On Mar 22, 8:35 am, "Andrew Durdin" <[EMAIL PROTECTED]> wrote:
> > Recently I've found myself repeating variables many times in
> > templates, much like this:
> >
> > {% if company.contact.email %}
> > <h3>Email address</h3>
> > <a href='mailto:
> > {{ company.contact.email }}'>{{ company.contact.email }}</a>
> > {% endifvalue %}
> >
> > This repetition is annoying, as well as inefficient if company.contact
> > involves a ForeignKey lookup.
> >
> > I've created a pair of tags, "ifvalue" and "ifnotvalue", to
> > encapsulate this behaviour:
> >
> > {% ifvalue company.contact.email as email %}
> > <h3>Email address</h3>
> > <a href='mailto:{{ email }}'>{{ email }}</a>
> > {% endifvalue %}
> >
> > The full code for the tag is athttp://www.djangosnippets.org/snippets/124/
> >
> > Andrew
>
>
> >
>
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