Does Django save model objects other than `save()` or `create()` methods?

Question

I’m writing something like the following:

class Foo(models.Model):
    a = models.CharField()

def f(foo: Foo) -> Foo:
    y = Foo(
        **{field.name: getattr(foo, field.name) for field in foo._meta.get_fields()}
    )  # copy foo with pk
    y.a = "c"
    return y

My concern is whether y are saved to DB before users call save() method. Could it occur?

Asked By: tamuhey

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Source

Answer 1

It’s not saved. You need to actually call y.save() for the updated fields to be persisted to the DB.

In this case, you can make the save more efficient by specifying fields which actually changed:

y.save(update_fields=['a'])

Answered By: smac89

Answer 2

No, y instance won’t be saved to DB before users call save() method. If you want to save the new instance y to the database, you need to call y.save().

Answered By: August Infotech

Does Django save model objects other than `save()` or `create()` methods?

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