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django models 自定义方法报错，我这哪里写的有问题？
source link: https://www.v2ex.com/t/849243
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class Detect(models.Model):
def chioce_id(self):
data = self.objects.all()
id = len(data) + 1
return id
detect_id = models.BigIntegerField(verbose_name='编号',default=chioce_id)
.......
为什么一直报我错呢？ 我想弄个可自填可手改的序号， 这方法在类里不能用吗？有别的法吗？
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