Is the server running on host "localhost" (127.0.0.1) - Reposting - django

Question

Please do not close my question again if you are not sure that the answer provide to others fit my case.
I am deploying a django app for the first time to Heroku. I used the following:
heroku run python manage.py migrate
and it returns :
Traceback (most recent call last):
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/backends/base/base.py", line 217, in ensure_connection
self.connect()
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/backends/base/base.py", line 195, in connect
self.connection = self.get_new_connection(conn_params)
File "/app/.heroku/python/lib/python3.6/site-packages/django/db/backends/postgresql/base.py", line 178, in get_new_connection
connection = Database.connect(**conn_params)
File "/app/.heroku/python/lib/python3.6/site-packages/psycopg2/__init__.py", line 122, in connect
conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
psycopg2.OperationalError: could not connect to server: Connection refused
Is the server running on host "localhost" (127.0.0.1) and accepting
TCP/IP connections on port 5432?
In my settings.py i have :
DATABASES = {
'default': dj_database_url.config(
default=config('DATABASE_URL')
)
}
and at the bottom :
try:
from .local_settings import *
except ImportError:
pass
in the local_settings.py I have :
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': 'newapp_development',
'USER': 'postgres',
'PASSWORD': '#####',
'HOST': 'localhost',
'PORT': '5432',
}
}
my .gitignore file looks like:
# byte-compiled / optimized / DLL files
__pycache__/
*.py[cod]
# tests and coverage
*.pytest_cache
.coverage
# database & logs
*.db
*.sqlite3
*.log
# venv
env
venv
# other
.DS_Store
# javascript
package-lock.json
staticfiles/*
!staticfiles/.gitkeep
!/core/local_settings.py
Do you know why is the error message please ?
Also, note that local_settings is added to . gitignore.
I did a few search on search engine and the responses that i found did not work for me or were not clear enough to me. This is the reason why I took the risk of asking publicly here.
Thank you for your help.

Answer 1

Solution found, the approach that I used works perfectly to manage two different db with two settings files.
What was wrong, was .env file which came with the template that I used. it had the following :
DATABASE_URL=jdbc:postgresql://localhost:5432/postgres
deleting this line makes it work both in production and locally.
Thank you guys for helping me eliminate the potential problems down to the main one.
And to those who downgraded my question,...not much to say actually.