construct + autoupdate(0)

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The docs on construct are a little thin as to what it really does or
expects. I know it just transforms data into objects without calling
the db, but what does it expect underneath? Does the
data-turned-object have to already exist in the database, or will it
do the right thing if update is called and create a corrisponding new
record?

What I need to do is to pass some data to construct() to get the
desired objects, but I don't want any record to exist in the database
until I do more futxing and then call update().

Is that feasable?

I know I could just wrap the whole process in a transaction and
rollback, but I'm trying to avoid relying on transactions being
available.

-=3DChris