Как привязать тэг к посту в django?

class Post(models.Model):
    date = models.DateTimeField(auto_now_add=True)
    title = models.CharField(max_length=32)
    image = models.URLField()
    content = models.TextField()
    tag = models.ManyToManyField('Tag', blank=True, related_name='posts')

    def __str__(self):
        return self.title

class Tag(models.Model):
    title = models.CharField(max_length=32)

    def __str__(self):
        return self.title