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SQL Query should define an `id` field in the result set. ActiveRecord::_getRecordsByQuery() :

           SELECT
                SUM(1 + s.number_children + s.number_adults) AS id
            FROM nwd_form_subscribe_log s
            left join nwd_locations l on s.location_id = l.id
            WHERE s.location_id = 725
            AND l.active = 1