dnit13 dnit13 - 9 months ago 49
Python Question

Changing callable for upload_to breaks migrations Django

I had a callable for my image uploads which looked like this:

class Rename(object):
def __init__(self, path):
self.path = path

def __call__(self, instance, filename):
# some stuff and returns path

when I changed the
signature to :

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

I can no longer run makemigrations:

File "/pathtomyapp/migrations/0001_initial.py", line 59, in Migration
('avatar', models.ImageField(blank=True, null=True, upload_to=myapp.models.Rename(b'profiles'))),
TypeError: __init__() takes exactly 3 arguments (2 given)

Is there any way to solve this without modifying Rename functions signature in migration files

Answer Source

You could either change the migration file and provide the file_type

('avatar', models.ImageField(blank=True, null=True, upload_to=myapp.models.Rename(b'profiles', 'file-type'))),

Or make the file_type argument optional in your __init__ method.

class Rename(object):
    def __init__(self, path, file_type=None):