Django multidb: write to multiple databases

Question

With Django multidb, it's fairly easy to write a router that runs a master/slave infrastructure. But is it possible to write a router that writes to multiple databases? My use case is a collection of projects, all running on the same domain. To save users from registering/login in on every site, I'd like to synchronize the contrib.auth and contrib.sessions tables. Is that possible with Django multidb or should I look into replication features of the database system (MySQL in my case)?

Answer 1

i think you will be better implementing an SSO or OAuth service

but if you want like to synchronize your table users between two database and if you are using your own UserModel you can do something like this

class MyUser(models.Model):
    name = models.CharField(max_length=100)
    user = models.ForeignKey(User, unique=True)


    def save(self, ...): # ALL the signature
        super(MyUser, self).save(using='database_1')
        super(MyUser, self).save(using='database_2')

you can also putting with a decorator like this, like this you can also use it for synchronizing other tables:

def save_multi_db(model_class):

    def save_wrapper(save_func): 
        def new_save(self, *args, **kws):
            super(model_class, self).save(using='database_1')
            super(model_class, self).save(using='database_1')
        return new_save

    func = getattr(model_class, 'save')
    setattr(model_class, 'save', save_wrapper(func)) 

    return save_wrapper

# and use it like this:

@save_multi_db
class MyUser(models.Model):
      ....

Hope this will help :)