For example, I have model:

class CacheMetaData(models.Model):
    count = models.IntegerField(default=0)

def inc(self):
    self.count += 1
    self.save()

If I define method inc() like above, then Django will execute a SQL statement like:

UPDATE the_table set count = 1 where id = 1

This way lead to race condition so that count might not be correctly increased. I want Django to execute:

update the_table set count = count + 1

So that count will always be correctly increased.

Can Django do that? If yes, how to define the field count?