django的orm查询使用in的保序

def get_hangqinng(username, code_list):
   result = []
   m_codes = mstockcodes(code_list)
   # stockshq = SectorStockHangqing.objects.filter(code__in=code_list)
   # pk_list = m_codes
   values = ' '.join(['WHEN stockcode="%s" THEN %s' % (pk, i) for i, pk in enumerate(m_codes)])
   ordering = 'CASE %s END' % values
   stockshq = Hangqing.objects.filter(stockcode__in=m_codes).extra(select={'ordering': ordering}, order_by=('ordering',))
   if stockshq.exists():
      set1 = set()
      for hq in stockshq:
         res = {}
         if hq.stockcode in set1:
            continue
         h_code = hq.stockcode.upper()
         price = get_num(hq.price)
         res['price'] = price
         percent, color = get_color(hq.pchange)
         res['color'] = color
         res['percent'] = percent
         res['number'] = h_code
         res['title'] = hq.stockname
         us = UserStock.objects.filter(username__exact=username).filter(stockcode__exact=h_code)
         show = 1
 if len(us) > 0 and us[0].active == 1:
            show = 0
 res['show'] = show
         set1.add(hq.stockcode)
         result.append(res)
      return result
   else:
      return None