I came across the same issue. I was trying to accomplish exactly the
same thing like the original poster (make sure that association is with
an actual record in the DB). I came across the same issue too, and after
a little debugging the core the solution is to use Proc.
This has to do with loading mechanics, IMO: when you run the spec, first
the model definition is loaded, there are no records in the DB yet, so
:in option is just empty array (I debugged this to be true). But if you
use Proc in that place, then the query to get records from DB is
executed "lazily"; by that time your spec has correct context setup
(manufacturers table populated) and thus you get correct behavior from
spec.
In your case you should use:
validates :manufacturer_id, :inclusion => {
:in => Proc.new { Manufacturer.all.collect { |m| m.id } }
}
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