Rails - Oct 2011 - Access other model attributes directly with has_one, belongs_to ?

So, I have 2 models A and B that share 5 common attributes and all other
attributes are different.  So I wanted to extract these 5 out into one
common table and use has_one, belongs_to to knit it back together.  So
now there are 3 tables with 1 having the shared properties, we''ll call
this table C.

Table A
id
dollar_amount

Table B
id
quantity_on_hand

Table C
id
version

My question is, I want to access attributes from table C like they are
in table A, such as:

@a = a.new
a.version

and NOT
a.c.version

Is my only option to use method_missing?

Anyone got any ideas?

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I think what you''re looking for is "delegate" which is a
rails extension to
Module:

http://api.rubyonrails.org/classes/Module.html#method-i-delegate

class ModelC < ActiveRecord::Base
  has_many :model_a
end

class ModelA < ActiveRecord::Base
  belongs_to :model_c
  delegate :version, :to => :model_c
end

Then you can call version on a ModelA instance like you want to.

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Thanks, I think that is what I''m looking for!

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