我想知道如何控制模型数据中的转换。我在如何检查 Django (django-admin) 中的值转换？但是当我试图在我的代码中实现它时，出了点问题（我可以不受惩罚地改变状态）：
这是我的代码的相关部分：
# Blog Entry Draft Status Constants
ENTRY_STATUS_DRAFT = 0
ENTRY_STATUS_PUBLISHED = 1
# Create your models here.
class Blog(models.Model):
title = models.CharField(max_length=200, unique=True)
body_html = models.TextField(blank=True)
pub_date = models.DateTimeField ('Date Published', blank=True, null=True, editable=False)
PUB_STATUS = (
(ENTRY_STATUS_DRAFT, 'Draft'),
(ENTRY_STATUS_PUBLISHED, 'Published'),
)
status = models.IntegerField(choices=PUB_STATUS, default=0)
def clean(self):
# Don't allow draft entries to have a pub_date.
if self.status == 'draft' and self.pub_date is not None:
raise ValidationError('Draft entries may not have a publication date.')
# Set the publication date for published items if it hasn't been set already
if self.status == ENTRY_STATUS_PUBLISHED and not self.pub_date:
self.pub_date = datetime.datetime.now()
def clean_status(self):
status = self.cleaned_data.get('status')
if status == ENTRY_STATUS_DRAFT:
if self.instance and self.instance.status == ENTRY_STATUS_PUBLISHED:
raise ValidationError('You cannot change published to draft')
return status
clean() 方法有效。我还尝试在 clean_status() 方法中使用 'Published' 和 'Draft' ，但这不起作用。
我是否将 clean_status 放在正确的位置？我忽略了什么吗？