On Wed, Dec 16, 2009 at 10:13 AM, Jeremy Dunck <[email protected]> wrote:
> This won't work, because deferred fields are descriptors, and
> accessing foo.field would run the query.
>
> Something you could do is foo.deferred_fields.field_name -> Boolean,
> but that seems pretty clunky to me.
You can get at this information now if you really need to::
>>> e = Entry.objects.defer('body')[0]
>>> [f.attname for f in e._meta.fields if f.attname not in e.__dict__]
['body']
But the point is that deferred fields are an optimization. You
shouldn't need to know which fields are deferred: you should be adding
``defer`` as a last-step optimization once you *know* the fields in
question aren't needed.
IOW, why do I need to inspect the ``Entry`` to figure out what's
deferred? I just *told you* what's deferred in the previous line.
Jacob
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