Write advanced filename patterns using the Format String Syntax.

pip install django-dynamic-filenames

Basic example:

from django.db import models
from dynamic_filenames import FilePattern

upload_to_pattern = FilePattern(
    filename_pattern='{app_label:.25}/{model_name:.30}/{uuid:base32}{ext}'
)

class FileModel(models.Model):
    my_file = models.FileField(upload_to=upload_to_pattern)

Auto slug example:

ext

File extension including the dot.

name

Filename excluding the folders.

model_name

Name of the Django model.

app_label

App label of the Django model.

instance

Instance of the model before it has been saved. You may not have a primary key at this point.

uuid

UUID version 4 that supports multiple type specifiers. The UUID will be the same should you use it twice in the same string, but different on each invocation of the upload_to callable.

The type specifiers allow you to format the UUID in different ways, e.g. {uuid:x} will give you a with a hexadecimal UUID.

The supported type specifiers are:

s

String representation of a UUID including dashes.

i

Integer representation of a UUID. Like to UUID.int.

x

Hexadecimal (Base16) representation of a UUID. Like to UUID.hex.

X

Upper case hexadecimal representation of a UUID. Like to UUID.hex.

base32

Base32 representation of a UUID without padding.

base64

Base64 representation of a UUID without padding.

Warning

Not all file systems support Base64 file names.

All type specifiers also support precisions to cut the string, e.g. {{uuid:.2base32}} would only return the first 2 characters of a Base32 encoded UUID.

You can also use a special slug type specifier, that slugifies strings.

Example:

from django.db import models
from dynamic_filenames import FilePattern

upload_to_pattern = FilePattern(
    filename_pattern='{app_label:.25}/{model_name:.30}/{instance.title:.40slug}{ext}'
)

class FileModel(models.Model):
    title = models.CharField(max_length=100)
    my_file = models.FileField(upload_to=upload_to_pattern)

Slug type specifiers also support precisions to cut the string. In the example above the slug of the instance title will be cut at 40 characters.