[Feature] Handle duplicating FileField/ImageField

[jackton1]

Is your feature request related to a problem? Please describe.

Based on https://groups.google.com/g/django-updates/c/vup1ZShMEgQ?pli=1.

I'll like to get a sense of the requirements of duplicating models with FileField's

Describe the solution you'd like?

Replicating FileFields should optionally be allowed to replicate the source object if required or set else it should be skipped if the current value would point to the same file.

Describe alternatives you've considered?

No response

Anything else?

No response

Code of Conduct

• I agree to follow this project's Code of Conduct

[RomainDLS]

I have create a workaround for this feature :

from django.db.models.fields.files import FieldFile
from django.core.files.base import ContentFile

from model_clone import CloneMixin as _CloneMixin

class CloneMixin(_CloneMixin):

    _clone_file_fields = []

    @staticmethod
    def _create_copy_of_instance(instance, **kwargs):
        """
        Create copy of instance.
        :param instance: instance to copy
        :param kwargs: kwargs for new instance
        :return: new instance
        """
        new_instance = super()._create_copy_of_instance(instance, **kwargs)

        # Handle file fields
        for f in instance.__class__._meta.concrete_fields:
            file_field = getattr(instance, f.name)
            if (
                f.name in instance._clone_file_fields and
                isinstance(file_field, FieldFile)
            ):
                new_file = ContentFile(file_field.read())
                new_file.name = file_field.name.split('/')[-1]
                setattr(new_instance, f.name, new_file)

        return new_instance

Usage :

class MyModel(models.Model):

    file_object = models.FileField()

    _clone_file_fields = ['file_object']
    _clone_excluded_fields = ['file_object']

[Adiorz]

I would like to add more to the requirements here: upload_to callable should be used for new instance to copy respective file to correct path