the "many" model from a many-to-one relationship can #save but isn't #valid?
Reported by Sam Merritt | December 21st, 2009 @ 05:25 PM
Full, runnable example here: http://gist.github.com/261185
If you have a many-to-one relationship, e.g. a sheep has many hooves, you can have a hoof model where hoof.valid? is false, but hoof.save is true.
That is,
s = Sheep.new
h = s.hooves.new
h.valid? # => false because :sheep_id is nil
h.save # => true; the parent gets saved first, thereby making h valid
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Sam Merritt