Rails - Apr 2007 - listing, restricting attributes on Single Table Inheritance

Hi Gurus,

I am new to rails/ruby and have a simple question. I have single table
inheritence implemented for different equipment. Each equipment has some
common attributes such as equipment name, id, name of inspector etc..
but can have totally different attributes .

like base

create table equipments
( id autonumber               |
  type varchar                |
  name varchar                |      COMMON FOR ALL EQUIPMENT
  comment varchar             |
  insepctor_id number         |
  insepction_date date        |
  Screen         boolean        > only for PC, TV
  Keyboard       boolean        > Only for PC
  Speaker        boolean        > Only for PC, hometheater
  Remote         boolean        > Only for hometheater, TV
and so on ....
)

So the heiracrhy is pretty simple i.e 2 levels , equipment is the base
class and particular type of equipments such as TV are derived classes

                   Equipment - base class
            TV , hometheater, PC - derived classes of base class .

Here are my problems

+ How do i define the attributes for each type of Equipment such as TV ,
PC , Hometheater in the model so that i can restrict the access to other
attributes?

+ How can get i list of attributes which are applicable for that Class
such as TV, PC or Hometheater?

I would like to write the generic forms, views ,controller for all the
classes using the tips in
http://wiki.rubyonrails.org/rails/pages/SingleTableInheritance/versions/76
. Are there are any examples ?


Thanks and I appreciate your Help,
Giri

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