Django - Static file not found

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

Serving static files can be achieved in several ways; here are my notes to self:

• add a static/my_app/ directory to my_app (see the note about namespacing below)
• define a new top level directory and add that to STATICFILES_DIRS in settings.py (note that The STATICFILES_DIRS setting should not contain the STATIC_ROOT setting)

I prefer the first way, and a setup that's close to the way defined in the documentation, so in order to serve the file admin-custom.css to override a couple of admin styles, I have a setup like so:

.
├── my_app/
│   ├── static/
│   │   └── my_app/
│   │       └── admin-custom.css
│   ├── settings.py
│   ├── urls.py
│   └── wsgi.py
├── static/
├── templates/
│   └── admin/
│       └── base.html
└── manage.py

# settings.py
STATIC_ROOT = os.path.join(BASE_DIR, 'static')
STATIC_URL = '/static/'

This is then used in the template like so:

# /templates/admin/base.html
{% extends "admin/base.html" %}
{% load static %}

{% block extrahead %}
    <link rel="stylesheet" href="{% static "my_app/admin-custom.css" %}">
{% endblock %}

During development, if you use django.contrib.staticfiles [ed: installed by default], this will be done automatically by runserver when DEBUG is set to True [...]

https://docs.djangoproject.com/en/1.10/howto/static-files/

When deploying, I run collectstatic and serve static files with nginx.

The docs which cleared up all the confusion for me:

STATIC_ROOT

The absolute path to the directory where collectstatic will collect static files for deployment.

...it is not a place to store your static files permanently. You should do that in directories that will be found by staticfiles’s finders, which by default, are 'static/' app sub-directories and any directories you include in STATICFILES_DIRS).

https://docs.djangoproject.com/en/1.10/ref/settings/#static-root

Static file namespacing

Now we might be able to get away with putting our static files directly in my_app/static/ (rather than creating another my_app subdirectory), but it would actually be a bad idea. Django will use the first static file it finds whose name matches, and if you had a static file with the same name in a different application, Django would be unable to distinguish between them. We need to be able to point Django at the right one, and the easiest way to ensure this is by namespacing them. That is, by putting those static files inside another directory named for the application itself.

https://docs.djangoproject.com/en/1.10/howto/static-files/

STATICFILES_DIRS

Your project will probably also have static assets that aren’t tied to a particular app. In addition to using a static/ directory inside your apps, you can define a list of directories (STATICFILES_DIRS) in your settings file where Django will also look for static files.

https://docs.djangoproject.com/en/1.10/howto/static-files/