ruby - Converting a Postgres query to Rails ActiveRecord? -


is possible write following query in rail's activerecord format? i've tried billion different ways arel can't same results.

select topic_id, count(*) total questions_topics question_id in (   select id   questions   user_id = 1000   union   select questions.id   questions join answers on (questions.id = answers.question_id)   answers.user_id = 1000 ) group topic_id order total desc;

well, should work. not same thing should give same results.

questiontopic.where(   "question_id in (?) or question_id in (?)",   question.where(user_id: 1000).select(:id),   answer.where(user_id: 1000).select(:question_id) ).group('topic_id')  .order('total desc')  .select('topic_id, count(*) total')

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