Multiple records, both save and create

Rails
1

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