django - 如何删除 Django 中的所有多对多对象

Question

我有一个模型 Foo。这与 Moo 有着多对多的关系。

现在 Foo 在其多对多字段中有许多对象，即它有 moo1、moo2、moo3 等如何将所有对象一起删除？我知道我们可以单独删除每个。

foo = FOO()
foo.save()
foo.moo.add(moo1)
foo.moo.remove(moo1)

即

foo = FOO()
foo.save()
foo.moo.add(moo1)
foo.moo.add(moo2)
foo.moo.reset() # This should remove all objects that have been added
                  # in this field. This does not work but I want
                  # something like this. 

Answer 1

使用clear方法。

Removes all objects from the related object set:

b = Blog.objects.get(id=1)
b.entry_set.clear() 

Note this doesn’t delete the related objects – it just disassociates them.

Just like remove(), clear() is only available on ForeignKeys where null=True.