Rails - Feb 2009 - polymorphic hm=>t

Hi,

I have the following class architecture:

class Container < ActiveRecord::Base
	has_many :containments, :order => ''position''
	has_many :parent_containments, :as => :containable, :class_name =>  
''Containment''
	has_many :containable_items, :through => :containments, :source  
=> :containable
end

class Containment < ActiveRecord::Base
	belongs_to :container
	belongs_to :containable, :polymorphic => true
end

class ContainedThing < ActiveRecord::Base
	has_many :parent_containments, :as => :containable, :class_name =>  
''Containment''
	has_many :containers, :through => :parent_containments
end

class OtherContainedThing < ActiveRecord::Base
	has_many :parent_containments, :as => :containable, :class_name =>  
''Containment''
	has_many :containers, :through => :parent_containments
end

The logic is... A container can contain many items. These items may be  
being contained inside other containers as well (ie has_and_belongs_to  
or has_many :through type association). Also, it''s possible for a  
container to store other containers in itself (hence the  
parent_containments association inside the container class).

Rails doesn''t like my code very much, though.

I can''t use the containable_items has_many :through association  
because Rails complains that I can''t use a polymorphic association as  
the target of a has_many :through.

Is there something I''m missing, or do I have to do most of the work  
via hand here?

(ie no automatic methods, etc, and I have to build, destroy and  
retrieve objects with a series of lines of code rather than simple one- 
method invocations, etc.)?

Thanks heaps,
Julian.

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