Django - Cannot create migrations for ImageField with dynamic upload_to value

Question

I just upgraded my app to 1.7 (actually still trying).

This is what i had in models.py:

def path_and_rename(path):
    def wrapper(instance, filename):
        ext = filename.split('.')[-1]
        # set filename as random string
        filename = '{}.{}'.format(uuid4().hex, ext)
        # return the whole path to the file
        return os.path.join(path, filename)
    return wrapper

class UserProfile(AbstractUser):
    #...
    avatar = models.ImageField(upload_to=path_and_rename("avatars/"),
                               null=True, blank=True,
                               default="avatars/none/default.png",
                               height_field="image_height",
                               width_field="image_width")

When i try to makemigrations, it throws:

ValueError: Could not find function wrapper in webapp.models.
Please note that due to Python 2 limitations, you cannot serialize unbound method functions (e.g. a method declared
and used in the same class body). Please move the function into the main module body to use migrations.

Answer 1

I am not sure if it is OK to answer my own question, but i just figured out (i think).

According to this bug report, i edited my code:

from django.utils.deconstruct import deconstructible

@deconstructible
class PathAndRename(object):

    def __init__(self, sub_path):
        self.path = sub_path

    def __call__(self, instance, filename):
        ext = filename.split('.')[-1]
        # set filename as random string
        filename = '{}.{}'.format(uuid4().hex, ext)
        # return the whole path to the file
        return os.path.join(self.path, filename)

path_and_rename = PathAndRename("/avatars")

And then, in field definition:

avatar = models.ImageField(upload_to=path_and_rename,
                               null=True, blank=True,
                               default="avatars/none/default.png",
                               height_field="image_height",
                               width_field="image_width")

This worked for me.

Answer 2

I had the same problem but I have many ImageFile in my models

head = ImageField(upload_to=upload_to("head")
icon = ImageField(upload_to=upload_to("icon")
...etc

I don't want create upload_to wraper func for every ImageField column I have.

So I just create a func named wrapper, and it woks

def wrapper():
    return

---

I think it works just fine because I opened migration file and I found this:

('head', models.ImageField(upload_to=wrapper)),

I guess it's not effect migration process

Answer 3

You can create function with kwargs like this:

def upload_image_location(instance, filename, thumbnail=False):
    name, ext = os.path.splitext(filename)
    path = f'news/{instance.slug}{f"_thumbnail" if thumbnail else ""}{ext}'
    n = 1
    while os.path.exists(path):
        path = f'news/{instance.slug}-{n}{ext}'
        n += 1
    return path

and use this method with functools.partial in your model:

image = models.ImageField(
    upload_to=upload_image_location,
    width_field='image_width',
    height_field='image_height'
)
thumbnail_image = models.ImageField(upload_to=partial(upload_image_location, thumbnail=True), blank=True)

You will get migration like this:

class Migration(migrations.Migration):

    dependencies = [
        ('news', '0001_initial'),
    ]

    operations = [
        migrations.AddField(
            model_name='news',
            name='thumbnail_image',
            field=models.ImageField(blank=True, upload_to=functools.partial(news.models.upload_image_location, *(), **{'thumbnail': True})),
        ),
        migrations.AlterField(
            model_name='news',
            name='image',
            field=models.ImageField(height_field='image_height', upload_to=news.models.upload_image_location, width_field='image_width'),
        ),
    ]