Is your CF base class an abstract base class[1]? If it's not, then your
database actually has separate tables for CF, CFI and CFT .. and when you
access a `doc.cf` you're really getting the CF model instance, *not* the
derived class instance.
IIRC if you make CF an abstract base class then this will work the way you
want -- accessing doc.cf will return an instance of the appropriate derived
class.
Alternatively, if you want to keep the multi-table setup, you can try to get
each derived class instance from the base class, as described here[2] ("If
you have a Place that is also a Restaurant...") -- like:
{{{
x = doc.cf.all()[0]
try:
x = x.cfi
x_is_a_CFI = True
x_is_a_CFT = False
except CFI.DoesNotExist:
try:
x = x.cft
x_is_a_CFT = True
x_is_a_CFI = False
except CFT.DoesNotExist:
# x is neither a CFI nor a CFT
}}}
[1]
http://docs.djangoproject.com/en/dev/topics/db/models/#abstract-base-classes
[2]
http://docs.djangoproject.com/en/dev/topics/db/models/#multi-table-inheritance
On Fri, May 6, 2011 at 3:41 PM, pbzRPA <pbz...@gmail.com> wrote:
> Just to clarify your suggestion
>
> In [100]: isinstance(x, CFT)
> Out[100]: False
>
> In [101]: isinstance(x, CFI)
> Out[101]: False
>
> In [105]: isinstance(e, CF)
> Out[105]: True
>
> This is not what I am looking for.
>
> I want to know to what class the CF primary key points to. So if it's
> CFT or CFI
>
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