How to access Heroku config variables inside Django settings - django

Question

I am trying to push my code on Heroku, I have hidden my secret key using environ package but now Heroku is not able to access it since I have ignored my .env file using gitignore, I have read about config vars in Heroku but I am having trouble understanding how do I make Django access those values
import os
import environ
# from .secret import key
env = environ.Env()
environ.Env.read_env()
SECRET_KEY = env('KEY',default=env('SECRET_KEY'))
updated code
In the log, it is giving me error like this
warnings.warn(
Traceback (most recent call last):
File "/app/.heroku/python/lib/python3.8/site-packages/environ/environ.py", line 277, in get_value
value = self.ENVIRON[var]
File "/app/.heroku/python/lib/python3.8/os.py", line 675, in __getitem__
raise KeyError(key) from None
KeyError: 'SECRET_KEY'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "manage.py", line 22, in <module>
main()
File "manage.py", line 18, in main
execute_from_command_line(sys.argv)
File "/app/.heroku/python/lib/python3.8/site-packages/django/core/management/__init__.py", line 419, in execute_from_command_line
utility.execute()
File "/app/.heroku/python/lib/python3.8/site-packages/django/core/management/__init__.py", line 413, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/app/.heroku/python/lib/python3.8/site-packages/django/core/management/__init__.py", line 244, in fetch_command
settings.INSTALLED_APPS
File "/app/.heroku/python/lib/python3.8/site-packages/django/conf/__init__.py", line 82, in __getattr__
self._setup(name)
File "/app/.heroku/python/lib/python3.8/site-packages/django/conf/__init__.py", line 69, in _setup
self._wrapped = Settings(settings_module)
File "/app/.heroku/python/lib/python3.8/site-packages/django/conf/__init__.py", line 170, in __init__
mod = importlib.import_module(self.SETTINGS_MODULE)
File "/app/.heroku/python/lib/python3.8/importlib/__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
File "<frozen importlib._bootstrap>", line 991, in _find_and_load
File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 783, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "/tmp/build_067d1d45/food_deliveryapp/settings.py", line 22, in <module>
SECRET_KEY = os.environ.get('KEY',env('SECRET_KEY'))
File "/app/.heroku/python/lib/python3.8/site-packages/environ/environ.py", line 127, in __call__
return self.get_value(var, cast=cast, default=default, parse_default=parse_default)
File "/app/.heroku/python/lib/python3.8/site-packages/environ/environ.py", line 281, in get_value
raise ImproperlyConfigured(error_msg)
django.core.exceptions.ImproperlyConfigured: Set the SECRET_KEY environment variable
! Error while running '$ python manage.py collectstatic --noinput'.
See traceback above for details.
You may need to update application code to resolve this error.
Or, you can disable collectstatic for this application:
$ heroku config:set DISABLE_COLLECTSTATIC=1
https://devcenter.heroku.com/articles/django-assets
! Push rejected, failed to compile Python app.
! Push failed

Answer 1

For every variable in .env create a Config Var, make sure names are UPPERCASE.
In your code you can access them via environ (map with all env variables):
my_secret = (os.environ.get("MY_SECRET", 'dev default value')