Django中软删除的具体实现

from django.db import models

class BaseModel(models.Model):
    is_delete = models.BooleanField(default=False, verbose_name="是否删除")

    class Meta:
        abstract = True  # 抽象基类，不会建表

class ActiveManager(models.Manager):
    def get_queryset(self):
        # 默认只返回 is_delete=False 的数据
        return super().get_queryset().filter(is_delete=False)

class User(BaseModel):
    name = models.CharField(max_length=100)

    # managers
    objects = ActiveManager()   # 默认只取未删除的
    all_objects = models.Manager()  # 需要时可以取所有（包括已删除的）

User.objects.all()        # 只会查 is_delete=False
User.all_objects.all()    # 不加过滤，所有数据都能查

class User(BaseModel):
    name = models.CharField(max_length=100)

    objects = ActiveManager()
    all_objects = models.Manager()

    def delete(self, using=None, keep_parents=False):
        self.is_delete = True
        self.save(update_fields=['is_delete'])  # 只更新 is_delete 字段

u = User.objects.get(id=1)
u.delete()  # 不会真正删除，只会把 is_delete 置为 True

class SoftDeleteQuerySet(models.QuerySet):
    def delete(self):
        return super().update(is_delete=True)

class ActiveManager(models.Manager):
    def get_queryset(self):
        return SoftDeleteQuerySet(self.model, using=self._db).filter(is_delete=False)

User.objects.filter(name="Tom").delete()  # 也会变成软删除