Django - How to reset model fields to their default value?

Question

What would be the most elegant\efficient way to reset all fields of a certain model instance back to their defaults?

Answer 1

Assign None to the fields, and save.

Answer 2

After you've made changes to that instance but before you've "saved" it, I assume? I think you'll probably need to re-retrieve it from the database... I don't think that Django model instances keep a "history" of changes that have been made to an instance.

Answer 3

I once did it this way. No better way I could think of.

from django.db.models.fields import NOT_PROVIDED

for f in instance._meta.fields:
    if f.default <> NOT_PROVIDED:
        setattr(instance, f.name, f.default)

# treatment of None values, in your words, to handle fields not marked with null=True
...
...
# treatment ends

instance.save()

Note: In my case all the fields, did have default value.

Hope it'll help. Happy Coding.