python – 在django中实现hashid

2019年7月28日 440次阅读

我一直在努力在
django模型中实现
hashids.我想基于模型的id获取hashid,比如当模型的id = 3时,哈希编码应该是这样的：hashid.encode(id).事情是我不能得到id或pk直到我保存它们.我的想法是获取最新的对象id并在其上添加1.但这不是我的解决方案.任何人都可以帮我搞清楚吗???

django模型是：

from hashids import Hashids
hashids = Hashids(salt='thismysalt', min_length=4)



class Article(models.Model):
    title = models.CharField(...)
    text = models.TextField(...)
    hashid = models.CharField(...)

    # i know that this is not a good solution. This is meant to be more clear understanding.
    def save(self, *args, **kwargs):
        super(Article, self).save(*args, **kwargs)
        self.hashid = hashids.encode(self.id)
        super(Article, self).save(*args, **kwargs)

最佳答案 如果还没有ID,我只会告诉它保存,所以它不会每次运行代码.您可以使用TimeStampedModel继承来执行此操作,这实际上非常适合在任何项目中使用.

from hashids import Hashids


hashids = Hashids(salt='thismysalt', min_length=4)


class TimeStampedModel(models.Model):
    """ Provides timestamps wherever it is subclassed """
    created = models.DateTimeField(editable=False)
    modified = models.DateTimeField()

    def save(self, *args, **kwargs):  # On `save()`, update timestamps
        if not self.created:
            self.created = timezone.now()
        self.modified = timezone.now()
        return super().save(*args, **kwargs)

    class Meta:
        abstract = True  


class Article(TimeStampedModel):
    title = models.CharField(...)
    text = models.TextField(...)
    hashid = models.CharField(...)

    # i know that this is not a good solution. This is meant to be more clear understanding.
    def save(self, *args, **kwargs):
        super(Article, self).save(*args, **kwargs)
        if self.created == self.modified:  # Only run the first time instance is created (where created & modified will be the same)
            self.hashid = hashids.encode(self.id)
            self.save(update_fields=['hashid'])
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