Rails - Mar 2012 - why doesn't .where() honor polymorphism?

I love the query interface (ActiveMethod::QueryMethods), but one thing
has bugged me: why doesn''t it generate calls for polymorphic
associations?  For example:

class MyModel < ActiveRecord::Base
  belongs_to :parent, :polymorphic => true
end

I would expect:

  MyModel.where(:parent => a)

to be equivalent to:

  MyModel.where("my_models.parent_id = ? AND my_models.parent_type =
?",
                           a.id, a.class.base_class.name)

Is there a philosophical reason it doesn''t make this transformation?

- ff

P.S.: After writing this, I realize it''s not just for polymorphism.  I
would expect the NON-polymorphic case to transform:

  MyModel.where(:parent => a)

into

  MyModel.where("my_models.parent_id = ?", a.id)

-- 
Posted via http://www.ruby-forum.com/.

-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.

When you write "belongs_to :parent" Rails expects there to be a class 
called Parent.

If you want this to be related to the MyModel class, you''ll need to 
explicitly state that:

 belongs_to :parent, :class_name => ''MyModel''

-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To view this discussion on the web visit
https://groups.google.com/d/msg/rubyonrails-talk/-/i62MUc2cQI4J.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.