Seqelize error when trying to run migrations on Heroku - heroku

Question

So I've triple checked my config.json to make sure that all of the keys are aligned with the heroku database:
"production": {
"name": "NAME",
"user": "USER",
"port": "5432",
"pass": "PASSWORD",
"host": "HOST",
"dialect": "postgres"
}
I know these values are working because I can access the db with pgcommander. I then do the following steps:
heroku config:set NODE_ENV='production' --app APP_NAME
heroku run node_modules/.bin/sequelize db:migrate
but always end up with the following error after the migration fails:
[00:27:42] Finished 'db:migrate' after 88 ms
Unable to connect to database: Error: SequelizeConnectionError: no PostgreSQL user name specified in startup packet
A google search for the error returns a surprisingly small amount of relevant results.
Any help appreciated.

Answer 1

I just solved this by changing my config.json and using a different order of heroku commands:
First I had to promote the heroku db: instructions for promoting db then change my
config.json
to the following:
"production": {
"use_env_variable": "DATABASE_URL"
}
Then run the following commands in terminal:
heroku run bash
now inside heroku bash:
sequelize db:migrate
I'm still not sure why specifying each key of the db url in config.json was giving me an error as they should be exactly the same.