Allow to define abstract class and don't hardcode upload_to path for each FileField

models.py

from django.db import models


class BaseFileField(models.FileField):
    """
    Allow to define abstract class and don't hardcode upload_to path for each FileField


    class BaseFile(models.Model):
        name = models.CharField(
            max_length=200,
            blank = True
        )
        file = BaseFileField(
            blank=True
        )

        class Meta:
            abstract = True


    class Tag(BaseFile):
        @staticmethod
        def get_upload_to(obj, filename, field):
            return '{}/{}'.format(
                obj._meta.app_label,
                filename
            )

        ...

    """
    def generate_filename(self, instance, filename):
        if hasattr(instance, 'get_upload_to'):
            upload_to = instance.get_upload_to(instance, filename, field=self)
            filename = self.storage.generate_filename(upload_to)
        else:
            filename = super().generate_filename(instance, filename)

        return filename