How can I join these tables?

[Christos_Zisopoulos2 (Christos Zisopoulos)]

Did you try:

class Unit < ActiveRecord::Base    has_many :rooms    has_many :renters, :through => :rooms, :source => :people

And then do a Unit.find(:first).renters for a list of people that are
renting in that unit?

-christos