I think I figured this one out. Like you, I was having the same issue where I could package and build my Django project with pyinstaller, but the static files could not be found when running the project from the built executable. Everything was working fine when I would run the project with manage.py, but this was a head scratcher.
The solution that worked for me was running the collectstatic function and then serving my static files from that directory instead of the app/static/app directory.
If you aren't familiar with collectstatic it essentially searches your project directory for all of the static files in your apps and puts them in a folder on your top level directory that you specify in your settings file.
Here's how to run it.
Here's a link to its documentation.
Now my top-level directory looked like this.
site
app
admin.py
apps.py
models.py
views.py
site
asgi.py
settings.py
urls.py
wsgi.py
media
media files
staticfiles
static files I want to serve (css, js, etc)
In my settings file I specified my static file settings like this...
STATIC_URL = '/staticfiles/'
STATICFILES_DIRS = [
os.path.join(BASE_DIR, 'app\\static\\app')
]
STATIC_ROOT = os.path.join(BASE_DIR, 'staticfiles')
Then in my urls.py file I included the staticfiles directory like this...
(Note this is the urls.py file in the main site directory not in the app directory if you made one in there)
from django.contrib import admin
from django.conf import settings
from django.urls import include, path
from django.conf.urls.static import static
urlpatterns = [
path('', include('app.urls')),
path('admin/', admin.site.urls),
] + static(settings.STATIC_URL, document_root=settings.STATIC_ROOT)
In my spec file I was able to add the folder like this...
datas=[('..\\site\\staticfiles\\', '.\\staticfiles\\')]
And then in my html file I was able to use the static files like this...
<script src="{% static 'app/static.js' %}"></script>
<link rel="stylesheet" type="text/css" href="{% static 'app/static.css' %}">
Hopefully this helps some people if they've run into the same problem. Also as a reminder be sure to run collectstatic before you build especially if you've modified or changed any of your static files.
python manage.py collectstatic
Cheers!