class BaseModel(models.Model):
is_delete = models.BooleanField(default=False, db_index=True)
c_time = models.DateTimeField(auto_now_add=True, max_length=0)
u_time = models.DateTimeField(auto_now=True, max_length=0)
objects = NotDeletedManager()
# 类中在定义一个类就代表是配置,约定俗成都叫Meta
class Meta:
# 基表必须设置abstract,基表就是给普通Model类继承使用的,设置了abstract就不会完成数据库迁移完成建表
abstract = True
def delete(self, using=None, keep_parents=False):
"""重写数据库删除方法实现逻辑删除"""
# self.is_delete = True
# self.save()
print("-------------model-delete")
using = using or router.db_for_write(self.__class__, instance=self)
assert self.pk is not None, (
"%s object can't be deleted because its %s attribute is set to None." %
(self._meta.object_name, self._meta.pk.attname)
)
collector = Collector(using=using)
collector.add_field_update(self._meta.get_field('is_delete'), True, [self])
collector.collect([self], keep_parents=keep_parents)
# 排除需要删除的instance 当前model,采用逻辑删除 同时执行外键的on_delete方法
collector.data.pop(self.__class__)
# print(collector.data)
collector.delete()
Collector采集器 中添加需要更新的字段,并在data中删掉当前model的instance即可
外键信息:
frame_id = models.ForeignKey(related_name="extend_frame_id_panel", to='BaseModel', to_field='id', on_delete=models.SET_NULL, db_constraint=False, db_column="frame_id", null=True, verbose_name="边框信息", help_text="边框信息")