fields.py

from django.db.models import ImageField
from django.dispatch import receiver
from django.db import models


class ResponsiveImageField(ImageField):
    def __init__(self, verbose_name=None, name=None, width_field=None, height_field=None, **kwargs):
        super(ResponsiveImageField, self).__init__(verbose_name, name, width_field, height_field, **kwargs)

    def save(self, *args, **kwargs):
        print("#### SAVE METHOD")
        super(ResponsiveImageField, self).save(*args, **kwargs)


@receiver(models.signals.pre_delete, sender=ResponsiveImageField)
def delete_files(sender, instance, *args, **kwargs):
    print("#### DELETE FILES RECEIVER")
    if instance and instance.img:
        instance.img.delete()