Question

我有以下型号

class Database(models.Model):
    user = models.ForeignKey(User)
    name = models.CharField(max_length=100)
    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(auto_now=True)


class DatabaseUser(models.Model):
    user = models.ForeignKey(User)
    name = models.CharField(max_length=100)
    password = models.CharField(max_length=100)
    database = models.ManyToManyField(Database)
    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(auto_now=True)

一个DatabaseUser可以控制许多数据库。

如果我要删除数据库它想要删除DatabaseUser，我有这个问题..有没有办法阻止这种情况轻易发生？

Answer 1

目前尚不清楚为什么你有多个用户的fks，但除此之外你需要解开数据库和任何DatabaseUsers之间的关系

for db_user in yourdatabase.databaseuser_set.all(): #for all users who are linked to the DB you're about to kill
  db_user.database.remove(yourdatabase) #unhook the m2m

yourdatabase.delete()

[编辑错误修正]

删除Django中的manytomanyfield

1 个答案: