在 python 中制作 django rest api 时如何在模型中创建可选字段?

How to create optional fields in model when making a djangorestapi in python?

class IbaseEntity(models.Model):
    usrStatus = models.BooleanField()
    createdTime = models.DateTimeField()
    createdUserID = models.IntegerField(max_length=20)
    updateTime = models.DateTimeField()
    updateUserID = models.IntegerField(max_length=20)

class employee(IbaseEntity, models.Model):
    emp_id = models.IntegerField(max_length=20, primary_key=True)
    emp_name = models.CharField(max_length=20)
    emp_surname = models.CharField(max_length=20)
    def __str__(self):
        return self.emp_name

我希望所有日期时间字段都是可选的,我该怎么做?

尝试:

models.DateTimeField(null=True, blank=True)