Creating a master/detail record in one shot

How would I set up the controllers so that I can insert a detail record
with information from the web page and the master record at the same
time?

For instance if I had a new book entry in the book database I want to
add a new author record in the author database - assuming the author
did not exist.

Thanks!

It's easier than you think.

In general...

# set up the master record ...
# <however you do that> master = Master.find(id), etc.

# set up the detail records...
<however you do THAT>

# associate the 2
master.details << detail
# or, master.details = details
# or, master.details << details

# profit!
if master.save
    success
else
    error
end