I know this was discussed a while back, but I couldn't find the thread.
Issue is that has_one associations don't cache nils, whereas has_many do
cache the empty array.
Causes a big performance issue when you do things like:
class People < ActiveRecord::Base
has_one :thing
end
Person.find(:all, :include => :thing).each do |p|
...do something here with p.thing...
end
This results in lots of unnecessary and unexpected queries for all those
people that don't have things.
So...is this intentional? Would core be open to a patch that allowed AR
to differentiate between "nil -- this association needs to be loaded"
and "nil -- the target is actually nil"?
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