Rails - Mar 2006 - Multiple records, both save and create

Hello,

I have a time-entry system which I''m creating, and would like to know 
the best way to code a form where users can modify *and* create new 
records.

The screen will show time entries for the day.  The user can modify 
existing entries, as well as enter new ones.

Here''s a sample screen:

Hours:     Description:
4          Project 1
2          Project 2
X          --------
X          --------

The user can change the existing records, as well as enter new ones. 
There should always be four or five blank records like the ones marked 
"X" above.

I just want one "Submit" button on the form.

I suspect there are two ways of accomplishing this:
1) When the user presses "Submit", just zap all records from a given 
day, and re-create the newly submitted time entries.
or

2) Update the records that already exist, and create the records that do 
not yet have IDs.

Does anyone have a bird''s eye solution to this?  For example, do I use 
my controller''s "Create" or "Save" method to do
this?

Thanks,

--Tookelso

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