使用子选择来约束结果：
User.joins(:pets).where( 'id IN (SELECt user_id FROM pets WHERe animal = ?) AND id IN (SELECt user_id FROM pets WHERe animal = ?)', 'cat', 'dog')
使用子选择来约束结果：
User.joins(:pets).where( 'id IN (SELECt user_id FROM pets WHERe animal = ?) AND id IN (SELECt user_id FROM pets WHERe animal = ?)', 'cat', 'dog')
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