Rails - Oct 2010 - acts_as_list and single table inheritence

Hello Rails experts,



Need your help in following issue with the <b>acts_as_list and single
table inheritence</b>


Code details :
#model file
class <b>RelatedItem</b> < ActiveRecord::Base
acts_as_list :scope => :relater
belongs_to :relater, :polymorphic=>true
end

class RelatedLink < <b>RelatedItem</b>

end

class RelatedFeed < <b>RelatedItem</b>

end

class Clip < ActiveRecord::Base
has_many :<b>related_items</b>, :as => :relater
end

## Table Structure of <b>RelatedItem</b>
id             :integer(11)
name           :string(255)
relater_id     :integer(10)
relater_type   :string(255)
type           :string(255)
position       :integer(10)
source         :string(255)

#########

(http://pastie.org/1214846)


In the above case while creating new record for RelatedLink or
RelatedFeed it generating position number with scope of RelatedLink or
RelatedFeed..
like

@clip = Clip.find(10)

when creating records in RelatedLink
(i,e
@related_item = RelatedLink.new(:relater_id=>@clip.id,
:relater_type=>''#{@clip.class.name}'')
}

output showing like
rec 1 -> position=1 ,relater_id=10, relater_type="Clip",
type="RelatedLink"
rec 2 -> position=2 ,relater_id=10, relater_type="Clip",
type="RelatedLink"
rec 3 -> position=3 ,relater_id=10, relater_type="Clip",
type="RelatedLink"

AND when creating records in RelatedFeed
(i,e
@related_item = RelatedFeed.new(:relater_id=>@clip.id,
:relater_type=>''#{@clip.class.name}'')
)

with RelatedFeed output:
records 1  -> position=1 ,relater_id=10, relater_type="Clip",
type="RelatedFeed"
records 2  -> position=2 ,relater_id=10, relater_type="Clip",
type="RelatedFeed"
records 3  -> position=3 ,relater_id=10, relater_type="Clip",
type="RelatedFeed"

##

But here I need create those entries with the scope on Relater only and
not on RelaterFeed or RelatedLink
I mean do not want to repeat these Position number 1,2,3 then 1,2,3 for
same clip(i.e Relater). Currently it generating those positioning
individually for RelatedFeed and for RelatedLink of same Relater(i.e
clip)

Here I need something like when I''ll assign Relater to RelatedLink or
RelatedFeed it auto create positioning on the basis of Relater only
like

RelatedLink :
rec 1 -> position =1, relater_id=10, relater_type="Clip",
type="RelatedFeed"
rec 2 -> position =2, relater_id=10, relater_type="Clip",
type="RelatedFeed"
rec 3 -> position =3, relater_id=10, relater_type="Clip",
type="RelatedFeed"

Then for RelatedFeed
rec 1 -> position =4, relater_id=10, relater_type="Clip",
type="RelatedFeed"
rec 2 -> position =5, relater_id=10, relater_type="Clip",
type="RelatedFeed"
rec 3 -> position =6, relater_id=10, relater_type="Clip",
type="RelatedFeed"

position will be like 1,2,3,5,6.. etc

Any Idea..?? How is to be done..?

Thank you :)

-Ganesh K

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