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?

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.

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