Rails 3 - how to find last inserted ID from mysql table

Question

in my controller I have following sequence of commands:

SAVE DATA INTO FIRST TABLE

_get ID of inserted item into table from first step_

SAVE DATA INTO SECOND TABLE WITH ID FROM FIRST COMMAND

if FIRST.save && SECOND.save
 do something

And I am wondering, how to get id of item, which is immediately inserted into database... I tried to googling, but I can't find this information...

Thanks in advance for your hints

Answer 1

# SAVE DATA INTO FIRST TABLE
first_instance = FirstModel.new( :foo => :bar )
first_save = first_instance.save

# _get ID of inserted item into table from first step_
first_instance_id = first_instance.id

# SAVE DATA INTO SECOND TABLE WITH ID FROM FIRST COMMAND
second_save = SecondModel.new( :first_model_id => first_instance_id ).save

if first_save && second_save
  # do something
end