[Rails] Newbie question/help 2 tables, 'sync' cell values

[Alexandru Andrei]

I have to << search for each problems.room_id=rooms.id and do 
problems.room_no=rooms.room >>

HOW?

More details:

I have the following tables:
- a "rooms" table, with fields (id,room,create...)
- a "problems" table with fields (id,room_id,room_no, ...)

problem.rb has
	belongs_to :room
	validates_associated :room

and room.rb has
	validates_length_of :room, :within => 1..20
	validates_uniqueness_of :room, :message => "already exists!"
	has_many :problems

For "problems" in the edit/add form (_form partial) I have a drop down 
that named "Room no" that actually sets the value for room_id in the 
problems table.

How can I set the value of room_no field in the 'problems' table (to be 
the 'room' field in rooms?

Thank you, I hope this make sense...

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