mysql - Subquery returns more than 1 row sql query -


i had such error can explain did wrong?
add sql query: 

 (? = (select travel_region_id relationships travel_id = travels.id))

error

activerecord::statementinvalid (mysql::error: subquery returns more 1 row: select count(*) travel_start_days, cars, travels                    travels.id = travel_start_days.travel_id , travels.id = travel.car_id , travel_start_days.day > adddate(curdate(), interval '2' day) , (7 = (select travel_region_id relationships travel_id = travels.id)) , '2013-08-16' <= travel_start_days.day):

update whis method create query

def conditions       = ''       param = []       if @region && @region != ''         += 'travels.region_id = ?'         param += [@region.to_i]       end       if @car && @car != ''         += ' , ' if != ''         += 'cars.id = ?'         param += [@car.to_i]       end       if @relation && @relation != ''          += ' , ' if != ''         += '(? = (select travel_region_id relationships travel_id = travels.id))'         param += [@relation.to_i]       end       if @start_port && @start_port != ''         += ' , ' if != ''         += '(? = (select location_id travel_days travel_id = travel_start_days.travel_id , day_no = 1 order arrival asc limit 1))'         param += [@start_port.to_i]       end       return == '' ? nil : ["travel_start_days.day > adddate(curdate(), interval ? day) , " + where] + [@criteria[5]] + param     end

the issue in part of conditions:

(7 = (select travel_region_id relationships travel_id = travels.id))

obviously subquery returns more 1 travel_region_id replace = in

(7 in (select travel_region_id relationships travel_id = travels.id))

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