What can be the filename of uploading location for ImageField?

Question

Whenever I create Cloth Model with cloth_image, the image uploads to upload_location.

My problem is instance.id returns None because the instance is not yet created. What can be the best upload_location for ImageField?

def upload_location(instance, filename):
    new_id = instance.id
    ext = filename.split('.')[-1]
    return "clothes/%s/%s.%s" % (instance.user.id, new_id, ext) #  <- Right Here!

class Cloth(models.Model):
    cloth_image = models.ImageField(upload_to=upload_location,
                                null=True,
                                blank=True)

I'm using AWS S3.

score 1 · Answer 1 · answered Sep 27 '17 at 10:45

1

Just use the filename and not the id, e.g.

os.path.join('clothes', instance.user.id, filename)

Don't worry if filename already exists, Django automatically appends random strings at the end to avoid file replacements.

answered Sep 27 '17 at 10:45

dirkgroten

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score 1 · Accepted Answer · answered Sep 27 '17 at 11:07

1

if you want unique filename, i think you can use uuid for it, for example

import uuid
import os

def get_file_path(instance, filename):
    base_dir = 'clothes'
    user.id = str(instance.user.id)
    ext = filename.split('.')[-1]
    filename = "%s.%s" % (uuid.uuid4(), ext)
    return os.path.join(base_dir, user_id, filename)

answered Sep 27 '17 at 11:07

Brown Bear

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I like this idea. What if uuid.uuid4() generated previous id? Do they store previous generated id to somewhere? If not, it's just random integer, isn't it? – merry-go-round Sep 27 '17 at 15:07
this is composite field based on many parameters you can read more [uuid](https://docs.python.org/2/library/uuid.html) – Brown Bear Sep 27 '17 at 15:09
Um.. exactly. I want to generate REAL unique id for image filename. :( – merry-go-round Sep 27 '17 at 15:30
nvm uuid is pretty legit in generating random filename. Cool Stuff! Thanks – merry-go-round Sep 27 '17 at 15:42
glad to help you) – Brown Bear Sep 27 '17 at 17:32
Check this out!! https://stackoverflow.com/questions/46469026/retrieveapiview-without-lookup-field – merry-go-round Sep 28 '17 at 12:23

What can be the filename of uploading location for ImageField?

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