Copy a abstract model to another instance?

Question

I have the following situation:

class AbstractModel(models.Model):
    # fields

    class Meta:
        abstract = True

class A(AbstractModel):
    # no extra fields

class B(AbstractModel):
    # no extra fields

now i want to save one row from A to B, is there a easy way to do it? or do i need to copy every field on its own?

Also is there a better way in doing this? I need this, cause i have one table that could be modified by a user, but the other is frozen, from the frozen one i create pdfs, but when i change something in class A it shouldn't override something in class B, it should create a new instance of B.

Answer 1

now i want to save one row from A to B, is there a easy way to do it? or do i need to copy every field on its own?

You can use the model_to_dict from django.forms to generate an initial kwargs dict:

from django.forms import model_to_dict
a = A.objects.get(..)
kwargs = model_to_dict(a)
kwargs.pop('id')
b = B.objects.create(**kwargs)