ojuso-map/apps/files/models.py

from django.contrib.auth.models import User
from django.db import models
from django.utils.translation import ugettext_lazy as _


class BaseFile(models.Model):
    file = models.FileField(upload_to=".")
    user = models.ForeignKey(User, related_name="%(class)s", on_delete=models.PROTECT)

    class Meta:
        abstract = True

    def __str__(self):
        return self.file.name

    def name(self):
        return self.file.name


class File(BaseFile):
    pass


class ImageFile(BaseFile):
    caption = models.CharField(
        verbose_name=_("Image caption"), max_length=240, blank=True
    )

    credit = models.CharField(
        verbose_name=_("Image credit"), max_length=240, blank=True
    )