Django - Are model save() methods lazy? Django - Are model save() methods lazy? database database

Django - Are model save() methods lazy?


It does not make much sense to have a lazy save, does it? Django's QuerySets are lazy, the model's save method is not.

From the django source:

django/db/models/base.py, lines 424–437:

def save(self, force_insert=False, force_update=False, using=None):    """    Saves the current instance. Override this in a subclass if you want to    control the saving process.    The 'force_insert' and 'force_update' parameters can be used to insist    that the "save" must be an SQL insert or update (or equivalent for    non-SQL backends), respectively. Normally, they should not be set.    """    if force_insert and force_update:        raise ValueError("Cannot force both insert and updating in \            model saving.")    self.save_base(using=using, force_insert=force_insert,         force_update=force_update)save.alters_data = True

Then, save_base does the heavy lifting (same file, lines 439–545):

...transaction.commit_unless_managed(using=using)...

And in django/db/transaction.py, lines 167–178, you'll find:

def commit_unless_managed(using=None):    """    Commits changes if the system is not in managed transaction mode.    """    ...

P.S. All line numbers apply to django version (1, 3, 0, 'alpha', 0).