django manytomanyfield .add() method

Question

Suppose i have :

class Album(models.Model):
    photos = models.ManyToManyField(\'myapp.Photo\')
    photo_count = models.IntegerField(default = 0)

class P         


        

Answer 1

You can use django's signals and write a signal handler that will increment the counter using the m2m_changed signal:

https://docs.djangoproject.com/en/dev/ref/signals/#m2m-changed