How to display the content of one tble on another table view

hi all,
i just started on rails and ma trying to learn it so pls help me out
with following problem

i got 2 tables say tbl1 and tbl2 (tbl1 primary key is tbl2 foregn key)
both the tables have cntrls(say cntrl1 and cntr2) and models(model1 and
now i want to display the contens of tble2 in the show only tht contnds
of tbl2 whose foregn key is primary key of tbl1. that 2 in the rhtml
view of tbl1

also how do i add the primary key of tbl1 as foreing key of tbl2

pls help me out