I confused STATIC_ROOT and STATICFILES_DIRS
Actually I was not really understanding the utility of STATIC_ROOT. I thought that it was the directory on which I have to put my common files. This directory is used for the production, this is the directory on which static files will be put (collected) by collectstatic.
STATICFILES_DIRS is the one that I need.
Since I’m in a development environment, the solution for me is to not use STATIC_ROOT (or to specify another path) and set my common files directory in STATICFILES_DIRS:
#STATIC_ROOT = (os.path.join(SITE_ROOT, 'static_files/'))
import os
SITE_ROOT = os.path.dirname(os.path.realpath(__file__))
STATICFILES_DIRS = (
os.path.join(SITE_ROOT, 'static/'),
)
Also don’t forget to from django.conf import settings