我正在与Django一起创建一个合同模型,我遇到了一个难题,那就是如何获得从开始日期到结束日期的持续时间??
class Contract(models.Model):
name = models.CharField(max_length=100)
price = models.IntegerField(max_length=10)
start_date = models.DateField(auto_now_add=True)
end_date = models.DateField(auto_now_add=True)
duration = models.IntegerField(end_date - start_date) # how get the duration by hours
created_at = models.DateTimeField(auto_now_add=True)
def __str__(self):
return self.name