Django-Storages change s3 bucket on existing object-CodePudding

I have a django app that allows files to be uploaded to an S3 bucket using django-storages. The file is for a part that needs to be approved. Once it is approved, I'd like to move the file to a different S3 bucket.

class DesignData(models.Model):
    file = models.FileField(storage=PublicMediaStorage())
    ...

class PublicMediaStorage(S3Boto3Storage):
    location = "media"
    default_acl = "public-read"
    file_overwrite = False

After approval, I copy the file over to the new bucket using:

        client.copy_object(
            Bucket=settings.AWS_APPROVED_STORAGE_BUCKET_NAME,
            CopySource=copy_source,
            Key=design_data["s3key"],
        )

The file gets moved correctly however I need to update my object. How can I update the object? Trying something like myObject.file = "newbucket/myfile.txt" won't work as it is expecting an actual file. I've read I should be able to update the url with myObject.file.url = "newbucketaddress/myfile.txt" but I get an error AttributeError: can't set attribute.

Is there a way in django-storages with s3 to update an existing file s3 bucket?

CodePudding user response：

You may have to manually build the path to the new bucket. Boto3 docs will guide you.

Get the bucket location, name and object key. You can build the path to the object

CodePudding user response：

I ended up using somewhat of a workaround to resolve my issue. I ended up changing my model to include another file which would then store the new s3 bucket location.

class DesignData(models.Model):
    file = models.FileField(storage=PublicMediaStorage())
    approved_file = models.FileField(storage=ApprovedPublicMediaStorage())

I added ApprovedPublicMediaStorage():

class PublicMediaStorage(S3Boto3Storage):
    location = "media"
    default_acl = "public-read"
    file_overwrite = False
    custom_domain = "newbucketlocation0.s3...."

I did learn the hard way so make sure to include the custom_domain otherwise it will use the default_storage in the settings if it has been assigned. After I copy the file over to the new storage, I delete the old file and change file = null so only approved_file contains an s3 object.