Remove a file in Amazon S3 using Django-storages

Question

In my Django project I use Django-storageS to save media files in my Amazon S3.

I followed this tutorial (I use also Django-rest-framework). This works well for me: I can upload some images and I can see these on my S3 storage.

But, if I try to remove an instance of my model (that contains an ImageField) this not removes the corresponding file in S3. Is correct this? I need t remove also the resource in S3.

Answer 1

Deleting a record will not automatically delete the file in the S3 Bucket. In order to delete the S3 resource you need to call the following method on your file field:

model.filefield.delete(save=False)  # delete file in S3 storage

You can perform this either in

1. The delete method of your model
2. A pre_delete signal

Here is an example of how you can achieve this in the delete model method:

def delete(self):
    self.filefield.delete(save=False)
    super().delete()

Answer 2

You can delete S3 files by offering its id (filename in the S3 storage) using following code:

import boto
from boto.s3.key import Key
from django.conf import settings

def s3_delete(id):
    s3conn = boto.connect_s3(settings.AWS_ACCESS_KEY,
            settings.AWS_SECRET_ACCESS_KEY)
    bucket = s3conn.get_bucket(settings.S3_BUCKET)

    k = Key(bucket)
    k.key = str(id)
    k.delete()

Make sure that you setup S3 variable correctly in settings.py including: AWS_ACCESS_KEY, AWS_SECRET_ACCESS_KEY, and S3_BUCKET.

Answer 3

This works for me in aws s3,hope it helps

import os


@receiver(models.signals.post_delete, sender=YourModelName)
def auto_delete_file_on_delete(sender, instance, **kwargs):
    if instance.image:
        instance.image.delete(save=False)  ## use for aws s3
        # if os.path.isfile(instance.image.path): ## use this in development
        #     os.remove(instance.image.path)