Ok, I figured out "how many people tweet in french?" ... I was missing a
join:
> Person.joins(:tweets).where(:tweets => {:language_id => 'fr'}).count
(0.1ms) SELECT COUNT(*) FROM "people" INNER JOIN "tweets" ON
"tweets"."person_id" = "people"."id" WHERE "tweets"."language_id" = 0
Sarah
p.s. Thomas -- thanks I will read that too.
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