Re: Fast and Easy way to check if an instance of an Model exists in the Database

Den 16/01/2014 kl. 17.50 skrev Johannes Schneider <johannes.schneider@galileo-press.de>:

> The point is, I have to distinguish between an instance which is created, but its save method is not yet called. And an instance coming from the database via a manager.

Okay, then create an instance variable on the model instances when you create them manually. Something like this:

obj = InstanceModel()
obj.pk = 123
obj.manually_created = True

Then have your save() method check for this variable:

def save(self, *args, **kwargs):
if getattr(self, 'manually_created', False):
# Was created manually. Do something
else:
# From database. Do something else
super(self, InstanceModel).save(*args, **kwargs)
del obj.manually_created


Erik

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