Django: remove all m2m relations

if I have two simple models:

class Tag(models.Model):
  开发者_开发百科  name = models.CharField(max_length=100)

class Post(models.Model):
    title = models.CharField(max_length=100)
    tags = models.ManyToManyField(Tag, blank=True)

given a Post object with a number of Tags added to it, I know hot to remove any of them, but how to do a mass remove (remove all)? Thanks

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Have you tried Post.tags.clear()?

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If you need to delete only the relationship for all instance between 2 models then you can do that by accessing the Manager of the relationship table. The m2m relationship table can be accessed via MyModel.relations.through so for deleting the relationships it becomes easy:

MyModel.relations.through.objects.all().delete()

reference:

https://docs.djangoproject.com/en/dev/ref/models/fields/#django.db.models.ManyToManyField.through