On Tuesday, 21 June 2011 15:47:32 UTC+1, Jeff Blaine wrote:
>
> Okay, here's the problem.
>
> >>> f = dev._meta.get_field('distro')
> >>> f.value_from_object(dev)
> 2L
>
> value_from_object is defined as:
>
> ========================================================
> def value_from_object(self, obj):
> "Returns the value of this field in the given model instance."
> return getattr(obj, self.attname)
> ========================================================
>
> >>> f.attname
> 'distro_id'
> >>>
>
> As others guessed, value_from_object() is returning the pk ID in this
> case.
>
> Model "Distro" is the only model of mine showing this behavior, as it is
> the
> only foreign key "target" model I have defined without named primary key.
>
> From what I can tell, value_from_object() is actually mis-named, and should
> be named pkvalue_from_object(), no? Or is there some case where
> self.attname
> for a field is *not* set to the primary key attribute name?
>
> Any ideas? I really want (concept)
> "myfield.unicode_representation_of_object(myobject)"
>
But why do you need to get that value via the *field* object? The usual way
to do it is simply to access the attribute directly on the model instance:
unicode(dev.distro)
or, if you have the field name as a string as you imply originally, use
`getattr`:
unicode(getattr(dev, 'distro'))
--
DR.
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