Well, I couldn't rest until I figured out an implementation of
create_or_update (see version 1 above) using the oh-so-nifty
ActiveRecord::Relation framework.
Here it is:
class ActiveRecord::Base
def self.create_or_update(relation, attrs_to_update)
if (incumbent = relation.first).nil?
relation.create!(attrs_to_update)
else
incumbent.update_attributes(attrs_to_update)
incumbent
end
end
end
What's nice about this is that the relation can be a more expressive
selector than a simple hash
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