This is a pretty simple question but I haven't heard an answer for it
Let's say that a Bid object belongs_to both an Auction and a User at
the same time. To create a new object I could do something like
user.bids.build which would associate the new bid with that user, or
auction.bids.build which would associate the new Bid with the Auction,
but I have no idea how to create a new bid that would be associate with
both at the same time. I can of course force-feed the new bid object
with the id of the Auction or User objects, but that is the stupid way
to do it.
This is probably a very newb question, but it never came up with me
before, and I don't remember reading about it anywhere.