has_many having another has_many

A person has_many cars.

A car has_many lights.

Can I write a person has_many lights?

A snippet of code to help me understand will help.

Try person has_many :lights, :through => :cars

See http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html
for lots of examples of such things.

Colin