title: Reset many to many fields from model
body: <p>I want to reset all upvotes from all my Posts with django-orm, don`t know how to write query for that and apply it to the view. Also, maybe it would be better to make separate upvote model than just a field in the Post.</p>
  
  <pre><code>class Post(models.Model):
      author = models.ForeignKey(
          User,
          related_name='posts',
          on_delete=models.SET_NULL,
          null=True
      )
      title = models.CharField(max_length=100)
      creation_date = models.DateTimeField(auto_now_add=True)
      link = models.URLField()
      upvotes = models.ManyToManyField(User, related_name='upvotes', blank=True)
  </code></pre>