rubyonrailsin

hi there,
lets say you have:  A that belongs_to :b, and B belongs_to :c

how do you normally go about saying A belongs_to :c, :through => :b ??

searching I found two solutions:

1. method:
class A
def c
  b.c
end
end

and

2.delegate:
class A
delegate :c, :to => :b
end

but neither will have the benefits of generated sql with joins.

How you normally do this? and What are the reasons against having it on rails itself?

greetings
joaquin

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