Hello world,
I'm very new to Django and I come from a web2py background, so if this
should be obvious please forgive me. My webapp allows anonymous users to
upload files to my server for processing. I would like to track these files
by the session, and when the session expires I would like these files to be
deleted. I understand that I can run the manage.py clearsessions command to
remove expired sessions, but I'm a little fuzzy on how to make this
connection. I have added the django-cleanup application to my webapp and I
believe that it is installed correctly - though I'm not sure how to test
this. I currently have a table similar to the following:
class Raster(models.Model):
image = models.ImageField(
upload_to='rasters', width_field='width', height_field='height')
width = models.IntegerField(validators=[MinValueValidator(0)])
height = models.IntegerField(validators=[MinValueValidator(0)])
# when the session is deleted, this raster should be deleted as well
session = models.ForeignKey(Session, on_delete=models.CASCADE)
I'm able to populate the table with the an image file and session relation
using the following class method of Raster:
@classmethod
def Create_With_File(cls, name, file, session=None):
# build the raster
raster = cls(
session_id = session.session_key
)
# store the image file
raster.image.save(path.basename(name), ImageFile(file))
return raster
This is all well and good - my file is created in the filesystem and the
record is added in the database AFAIK. However, when I run manage.py
clearsessions my files persist. I guess I have a couple of related
questions:
1. I don't see a Session table in the admin interface, so it is difficult
for me to tell what is working and what is not... Should I be able to
inspect a Session table through admin?? For that matter I don't see a
Raster table to inspect either...
2. Assuming that sessions are being stored and removed from the database
correctly am I incorrect to assume that the manage.py clearsessions command
would trigger the ondelete cascade as defined in my model?
Thanks for any help you can give. I'm a little lost.
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