python - Django OneToOneField 默认值

Question

最近我在 django 模型中添加了一个 OneToOneField ，我在该字段中将 None 设置为默认值。然后我得到了这个错误:

django.db.utils.IntegrityError:NOT NULL 约束失败:user_myuser.album_id

型号:

class MyUser(models.Model):

    username = models.CharField(unique=True, max_length=25)
    first_name = models.CharField(max_length=50, default='')
    last_name = models.CharField(max_length=70, default='')
    register_date = models.DateTimeField(default=timezone.now)
    update_at = models.DateTimeField(auto_now=True)

    # the default value problem is here 
    album = models.OneToOneField(Album, auto_created=True, 
    on_delete=models.CASCADE, default=None)

这是专辑模型:

class Album(models.Model):
    name = models.CharField(max_length=100, null=True)
    author = models.CharField(max_length=100, null=True)
    picture_address = models.ImageField(upload_to=album_upload_destination, null=True)
    creation_year = models.IntegerField(default=-1)
    rate = models.IntegerField(default=0)
    timestamp = models.DateTimeField(auto_now_add=True)

Answer 1

由于 NOT NULL 约束失败，因此出现错误。

要么使null=True

album = models.OneToOneField(Album,on_delete=models.CASCADE, null=True)

或者使用信号将用户与相册联系起来。