软删除

简单的说，就是当执行删除操作的时候，不正真执行删除操作，而是在逻辑上删除一条记录。这样做的好处是可以统计数据，可以进行恢复操作等等。

预备知识

Managers

Managers 是django models 提供的一个用于提供数据库查询操作的接口，对于Django应用程序中的每个model都会至少存在一个Manager

详细：https://docs.djangoproject.com/en/dev/topics/db/managers/

django实现软删除model

firstly，

from django.db import modelsfrom django.db.models.query import QuerySet# 自定义软删除查询基类class SoftDeletableQuerySetMixin(object): """ QuerySet for SoftDeletableModel. Instead of removing instance sets its ``is_deleted`` field to True. """ def delete(self): """ Soft delete objects from queryset (set their ``is_deleted`` field to True) """ self.update(is_deleted=True)class SoftDeletableQuerySet(SoftDeletableQuerySetMixin, QuerySet): passclass SoftDeletableManagerMixin(object): """ Manager that limits the queryset by default to show only not deleted instances of model. """ _queryset_class = SoftDeletableQuerySet def get_queryset(self): """ Return queryset limited to not deleted entries. """ kwargs = {'model': self.model, 'using': self._db} if hasattr(self, '_hints'): kwargs['hints'] = self._hints return self._queryset_class(**kwargs).filter(is_deleted=False)class SoftDeletableManager(SoftDeletableManagerMixin, models.Manager): pass

secondly，

# 自定义软删除抽象基类class SoftDeletableModel(models.Model): """ An abstract base class model with a ``is_deleted`` field that marks entries that are not going to be used anymore, but are kept in db for any reason. Default manager returns only not-deleted entries. """ is_deleted = models.BooleanField(default=False) class Meta: abstract = True objects = SoftDeletableManager() def delete(self, using=None, soft=True, *args, **kwargs): """ Soft delete object (set its ``is_deleted`` field to True). Actually delete object if setting ``soft`` to False. """ if soft: self.is_deleted = True self.save(using=using) else: return super(SoftDeletableModel, self).delete(using=using, *args, **kwargs)class CustomerInfo(SoftDeletableModel): nid = models.AutoField(primary_key=True) category = models.ForeignKey("CustomerCategory", to_field="nid", on_delete=models.CASCADE, verbose_name='客户分类', db_constraint=False) company = models.CharField(max_length=64, verbose_name="公司名称")

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