hi,
yesterday i was bitten by something in the manipulator-behaviour, which
i did not really expect to work that way...and i'm now not sure if i
should submit a bugreport, or it should behave like that. also, it's
quite possible that i understood this wrong, if that's the case please
correct me.
let's say you have a model called Owner, that references using a
foreignkey a Thing.
=====================
class Thing(Model):
name = CharField(maxlength=500)
=====================
=====================
class Owner(Model):
name = CharField(maxlength=500)
thing = ForeignKey(Thing)
=====================
now let's say you have a LOT of Things... like 50000.
now, when you call Owner.AddManipulator(), he's going to fetch the WHOLE
Thing-table. just to construct the AddManipulator.
(well, i REALLY hope that's not the case, but from the db-queries it
seems so)
i understand that if you want to build later a select-box from this
data, then you need all the Thing objects, but in my case that will
never happen.
and to validate it's input i think it's absolutely unnecessary to load
in the whole table.
to build the error-message, yes, there it might need it. but only when
he really has to build the error message.
so, should i report this as a bug, or is this behavior intentional?
also, while we're at it... is there a workaround?
i tried to experiment with the "follow" parameter, to have the
manipulator ignore the thing_id field, and seems to help in the
ChangeManipulator case, but in the AddManipulator case it does not help,
because then i cannot save the object.
is there a way to tell the manipulator to take some additional data for
the object-save?
thanks,
gabor
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