Rename environment variables - variables

Question

Heroku currently provides the database credentials as one connection string i.e: postgres://foo:bar#baz/fubarDb.
My development environment consists of a PostgreSQL container and an app container orchestrated with a docker-compose file. The docker-compose file supplies environment variables from .env file which currently looks a little like this:
DB_USER=foo
DB_PASS=bar
DB_HOST=baz
These credentials are passed to my app as environment variables and all is well. The problem is that in order to make this work, I have to have a null check in my db connection info to see if there is a full database URL and use that...otherwise fall back to individual credentials....

Answer 1

D'oh! So, it turns out the solution, was to modify my docker-compose file to take the environment variables and concatenate them into a connection string thusly:
diff --git a/docker-compose.yml b/docker-compose.yml
index 21f0d47..74a574e 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
## -16,14 +16,10 ## services:
context: .
target: base
environment:
- - APP_NAME
- - DB_HOST
- - DB_PORT
- - DB_NAME
- - DB_USER
- - DB_PASS
- - NODE_ENV
- - PORT
+ APP_NAME: ${APP_NAME}
+ NODE_ENV: ${NODE_ENV}
+ PORT: ${PORT}
+ DATABASE_URL: postgres://${DB_USER}:${DB_PASS}#${DB_HOST}:${DB_PORT}/${DB_NAME}
user: "1000:1000"
ports:
- "127.0.0.1:${PORT}:${PORT}"
No more trying to guess which environment variables to look for!