Rails - Apr 2011 - Why does AR use base_class for polymorphic relationship "type"

I have a couple models that inherit from a base class that then
inherits from AR.

When they are used in a polymorphic relationship the "type" is always
the base class.

Just curious if anyone has a reason why it doesn''t use the *actual*
class rather then the base_class.  I have patched AR to use the actual
class if !base_class.table_exists? but it adds another query each time
(which in turn fails some of the rails tests).

My only guess was for use with STI, but even then I am not sure if
there is a better solution then using the base_class

-Eric

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On Apr 5, 5:54 am, FuelXC <e...-BSXVcfXPjW3QT0dZR+AlfA@public.gmane.org>
wrote:
> I have a couple models that inherit from a base class that then
> inherits from AR.
>
> When they are used in a polymorphic relationship the "type" is
always
> the base class.
>
> Just curious if anyone has a reason why it doesn''t use the
*actual*
> class rather then the base_class.  I have patched AR to use the actual
> class if !base_class.table_exists? but it adds another query each time
> (which in turn fails some of the rails tests).
>
> My only guess was for use with STI, but even then I am not sure if
> there is a better solution then using the base_class
By default, Rails stores the class name that corresponds to the
*table* name that the record is from (to avoid storing duplicate data
for STI subclasses). If you''re actually storing the subclasses in
different tables, you''ll probably want to do
''self.abstract_class true'' in the base class to make this
clearer.

--Matt Jones

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