对数据库ID进行散裂化计算
import basehash class Hasher: """ 对数据库ID进行散列化计算 """ base36 = basehash.base62(11) @classmethod def from_model(cls, obj): if obj.pk is None: return None return cls.make_hash(obj.pk) @classmethod def make_hash(cls, object_pk): return cls.base36.hash('%(object_pk)d' % { 'object_pk': object_pk }) @classmethod def to_object_pk(cls, obj_hash): unhashed = '%d' % cls.base36.unhash(obj_hash) object_pk = int(unhashed) return object_pk
class BaseModel(models.Model): """自定义Model基类""" create_at = models.DateTimeField(auto_now_add=True, verbose_name='创建时间') update_at = models.DateTimeField(auto_now=True, verbose_name='更新时间') delete_at = models.DateTimeField(null=True, blank=True, default=None, verbose_name='删除时间') class Meta: abstract = True @property def hash(self): return Hasher.from_model(self)
class HashRetrieveViewSetMixin(GenericViewSet): """使用Hash检索对象的ViewSet基类""" def get_object(self): queryset = self.filter_queryset(self.get_queryset()) obj = self.get_obj_from_hash(self.kwargs['pk'], queryset) self.check_object_permissions(self.request, obj) return obj def get_obj_from_hash(self, hash_id, queryset): """根据hash_id获取obj对象""" pk = self.hash_to_pk(hash_id) obj = get_object_or_404(queryset, pk=pk) return obj @staticmethod def hash_to_pk(hash_id): """Hash 转 id""" try: pk = Hasher.to_object_pk(hash_id) except ValueError: raise ParseError('parse error') return pk
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