[Rails] Re: Arel quiz: complex queries with associations

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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