Installation
============

Usage
=====

.. code-block:: python

   def generate_filename(instance, filename):
     return f"{instance.parent.storage}:some_folder/{filename}"

   class SomeParentModel(models.Model):
     storage = models.ForeignKey('byostorage.UserStorage',
         on_delete=models.CASCADE)

   class MyModel(models.Model):
     parent = models.ForeignKey('SomeParentModel',
         on_delete=models.CASCADE)

     photo = models.FileField(
         storage=BYOStorage(),
         upload_to=generate_filename)