Rails - Jul 2006 - Polymorphic Associations: dynamic finders

Is there any sort of dynamic finder for polymorphic associations?

For example if I had:

class InviteNode < ActiveRecord::Base
  belongs_to :inviteable, :polymorphic => true
end

I would like to be able to search by:

InviteNode.find_by_inviteable(some_object)

instead of having to do:

InviteNode.find_by_inviteable_id_and_inviteable_type(some_object.id,
some_object.class.name)

obviously I could write my own, but am I missing something?  Is there a reason
Rails doesn''t provide something like this for you?

- steve

steve dp wrote:
> Is there any sort of dynamic finder for polymorphic associations?
> 
> For example if I had:
> 
> class InviteNode < ActiveRecord::Base
>   belongs_to :inviteable, :polymorphic => true
> end
> 
> I would like to be able to search by:
> 
> InviteNode.find_by_inviteable(some_object)
> 
> instead of having to do:
> 
> InviteNode.find_by_inviteable_id_and_inviteable_type(some_object.id,
> some_object.class.name)
> 
> obviously I could write my own, but am I missing something?  Is there a 
> reason
> Rails doesn''t provide something like this for you?
Because it''s a little tricky to code it up. I''ve got a test
plugin for a
dynamic finder patch that does dynamic finders for belongs_to 
associations already, and I''m working on the polymorphic version next. 
But it''s not totally straightforward to do it in a way that makes
sense.
I could bang out something that was gross, but I''m too proud to do that
:-)

http://blog.hasmanythrough.com/articles/2006/07/02/patch-test-plugin-dynamic-finders-with-belongs_to-names

--
Josh Susser
http://blog.hasmanythrough.com

-- 
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