code: def raw_query_mongo_db(kwargs, database_name, collection_name):
      # for key in kwargs:
      #    print "arg: %s: %s" % (key, kwargs[key])
      
      l = []
      response_dict = {}
  
      try:
          mongodb_client_url = getattr(settings, 'MONGODB_CLIENT',
                                   'mongodb://localhost:27017/')
          mc = MongoClient(mongodb_client_url,document_class=OrderedDict)
          db = mc[database_name]
          transactions = db[collection_name]
          mysearchresult = transactions.find(kwargs)
          mysearchcount = mysearchresult.count()
          if mysearchcount > 0:
              response_dict['code'] = 200
              for d in mysearchresult:
                  l.append(d)
              response_dict['results'] = l
      except:
          # print "Error reading from Mongo"
          # print str(sys.exc_info())
          response_dict['code'] = 400
  
          response_dict['type'] = "Error"
          response_dict['message'] = str(sys.exc_info())
      return response_dict
docs: return a result list or an empty list