Rails - Mar 2012 - Re: Rails - validate inclusion fails on rake test:integration

Frederick Cheung: "why validate the inclusion at all ? I''d
validate the presence of the
foo_id column and use a foreign key constraint to ensure that it can''t
contain junk."

How you''d "use a foreign key constraint"? That is, how do
you''d implement the code in order "to ensure that it
can''t contain junk"?

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