为什么在Django上使用bulk-create插入带外键的数据会返回“property object is not callable”?

我将Django 2.17与SQLite 3.26数据库一起使用,并尝试从csv文件插入数据。我用的是get_或_create方法,但是太慢了。所以我开始尝试使用bulk_create插入。

我使用的模型字段如下:

class SENSOR_TEMPERATURA(models.Model):
    ID_Sensor_Temperatura = models.AutoField(primary_key = True)

class VALOR_TEMPERATURA(models.Model):
    ID_Valor_Temperatura = models.AutoField(primary_key = True)
    ID_Sensor_Temperatura = models.ForeignKey(SENSOR_TEMPERATURA, on_delete = models.PROTECT, null = False, db_column = 'VATE_CD_ID_Sensor_Temperatura')
    Data_De_Medição = models.DateTimeField(default = datetime.now(), null = False)
    Valor = models.DecimalField(default = 0, null = False, max_digits = 30, decimal_places = 15)

     print (datetime.datetime.now())         
     reader = csv.reader(f) 
     insert_CSV = [] 
     count = 1 
     for row in reader: 
         insert_CSV.append([ 
         VALOR_TEMPERATURA.pk(ID_Valor_Temperatura = count), 
         VALOR_TEMPERATURA(Data_De_Medição = datetime.datetime.strptime(row[0] + " UTC-0300",'%d/%m/%Y %H:%M:%S %Z%z')), 
         VALOR_TEMPERATURA(Valor = float(row[1])), 
         VALOR_TEMPERATURA(ID_Sensor_Temperatura = SENSOR_TEMPERATURA.objects.get(ID_Sensor_Temperatura = 4)) 
         ]) 
         count = count + 1 
     print (datetime.datetime.now()) 
     VALOR_TEMPERATURA.objects.bulk_create(insert_CSV) 
     print (datetime.datetime.now()) 

我认为让我陷入麻烦的部分是“ID_Sensor_temperaturea=Sensor_temperaturea.objects.get(ID_Sensor_temperaturea=4))”,但这正是我在使用get_或_create时定义外键的方式,所以我无法找出问题所在。

我得到以下错误:

  6     for row in reader:
  7         insert_CSV.append([
  8         VALOR_TEMPERATURA.pk(VATE_CD_ID_Valor_Temperatura = count),
  9         VALOR_TEMPERATURA(VATE_DF_Data_De_Medição = datetime.datetime.strptime(row[0] + " UTC-0300",'%d/%m/%Y %H:%M:%S %Z%z')),
 10         VALOR_TEMPERATURA(VATE_VL_Valor = float(row[1])),

TypeError: 'property' object is not callable

有什么问题吗?