I've got 3 tables: t1, t2 and t3. t1 belong_to t2 that
              belongs_to t3. I would like to link t1 to t3 using
              has_one through. In my t1 model, I've got  "has_one
              :t3, :through => :t2" but when I'm doing my join on t3
              from t1, the joint is not right. Instead of having
              t1.fk_t2 = t2.id, I've got t1.id = t2.fk_t1 wich does
              not exist. Any idea?

t1 belongs_to t2
t2 belongs_to t3