#12199: Give 'firstof' tag ability to assign result to context
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Reporter: tiliv | Owner: nobody
Status: new | Milestone: 1.2
Component: Template system | Version: SVN
Keywords: firstof, as, context | Stage: Unreviewed
Has_patch: 1 |
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When you need to access fields on objects in a {{{ {% firstof %} }}}
fashion, semantically 'optional' fields can cause issues:
{{{
Today the teacher is {% firstof substitute.name teacher.name %},
and drives a {% firstof substitute.car teacher.car %}
}}}
If {{{ substitute }}} doesn't have a value for {{{ car }}}, then it will
fall back to {{{ teacher.car }}}.
The real issue is that {{{ {% firstof %} }}} cannot preserve its value for
later multiple inspections. If the {{{ {% firstof %} }}} tag could assign
its result to a context variable, it would solve this problem:
{{{
{% firstof substitute teacher as teacher_for_today %}
Today the teacher is {{ teacher_for_today }}
{% if teacher_for_today.car %}
and drives a {{ teacher_for_today.car }}
{% endif %}
}}}
I am unsure that this is possible to achieve without the {{{ as }}}
syntax. One would have to code a template tag or filter for the sole
purpose of duplicating the exact functionality that I propose be added to
{{{ {% firstof %} }}}.
Attached patch for functionality and documentation on the subject.
--
Ticket URL: <http://code.djangoproject.com/ticket/12199>
Django <http://code.djangoproject.com/>
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