Specific association to acts_as models

[igrek8]

Please correct me or suggest,

My concern is how to get a specific collection from has_many in Test::Owner models rather than generic?

When specifying

# adding to super_class.rb
belongs_to :ownerable, polymorphic: true

# change in owner.rb
has_many :sub_classes_a, as: :ownerable, class_name: 'Test::SubClassA'

and trying to get specific collection through has_many by invoking owner.sub_classes_a, Rails will automatically include the column test_sub_classes_as.ownerable_id in select query which is only possible in test_super_classes table giving an exception such column not found in table sub_classes_as.

With the following definition

# super_class.rb
class Test::SuperClass < ActiveRecord::Base
  belongs_to :ownerable, polymorphic: true
  actable as: :superclassable
end

# super class migration
create_table :test_super_classes do |t|
  t.references :ownerable, polymorphic: true
  t.actable as: :superclassable
  t.timestamps
end

# sub_class_a.rb
class Test::SubClassA < ActiveRecord::Base
  acts_as :super_class, as: :superclassable, class_name: 'Test::SuperClass'
end

# sub_class_b.rb
class Test::SubClassB < ActiveRecord::Base
  acts_as :super_class, as: :superclassable, class_name: 'Test::SuperClass'
end

# owner.rb, has_many actables
class Test::Owner < ActiveRecord::Base
  has_many :sub_classes_a, as: :ownerable, class_name: 'Test::SuperClassA'
end

# special_owner.rb, has_many actables, STI from Test::Owner
class Test::SpecialOwner < Owner
  has_many :sub_classes_b, as: :ownerable, class_name: 'Test::SuperClassB'
end

I am able to do Test::Owner.new(sub_classes_a: [Test::SubClassA.new]).save to save a specific object in the format

// table: test_super_classes (generic)
id: xx
ownerable_id: xx
ownerable_type: Test::Owner
superclassable_id: xx
superclassable_type: Test::SubClassA
...     

However, in my design I have to have has_many with specific class_name: 'Test::SubClassA' to enforce only these objects to be stored and referenced from the model. Moreover, SubClassA and SubClassB have to have a reference back to the owner

Thanks!