Hi,
Before I put any work into this, I want to know if (a) I'm missing something
super-obvious in the QuerySet functionality, or (b) this idea has already been
explored and rejected.
Sometimes, it would be nice to get a slice of a QuerySet but *not* actually
evaluate the QuerySet; instead, leave it unevaluated. An example of this would
be an implementation of blog navigation:
context['previous_entry'] =
Entry.objects.filter(entry_date__lt=current.entry_date).order_by('-entry_date')[0]
context['next_entry'] =
Entry.objects.filter(entry_date__gt=current.entry_date).order_by('entry_date')[0]
This works fine, but it grabs the relevant object immediately. It would be
handy to have a syntax that continued to defer the execution of the query, in
case (for example) the navigation is cached by a template fragment {% cache $}
tag. Something like:
context['previous_entry'] =
Entry.objects.filter(entry_date__lt=current.entry_date).order_by('-entry_date').limit(limit=1,
offset=0)
context['next_entry'] =
Entry.objects.filter(entry_date__gt=current.entry_date).order_by('entry_date').limit(limit=1,
offset=0)
Then, in the template, {{ previous_entry.get }} could be used to fetch the
result.
Thoughts?
--
-- Christophe Pettus
[email protected]
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