Postgres db not working on Heroku - ruby-on-rails

Question

I've spend several hours figuring out how to get my database up and running. I created a new rails app and wanted to deploy it to heroku. I followed the instructions from heroku (to switch from sqlite3 -> postgresql) but it just doesn't work.
This is in my database.yml file:
default: &default
adapter: postgresql
pool: 5
timeout: 5000
development:
<<: *default
database: myapp_development
test:
<<: *default
database: myapp_test
production:
<<: *default
database: myapp_production
url: <%= ENV['DATABASE_URL'] %>
I can't create or seed any data in the database. Sometimes it executes the db:migrate, but even then it doesn't create anything. This is what I get when running:
heroku run rake db:create
FATAL: permission denied for database "postgres"
DETAIL: User does not have CONNECT privilege.
Does anyone has an idea on how to solve this? I don't have a clue anymore ...
Thanks!

Answer 1

By default you don't need to create a db on heroku.
Just run heroku run rails db:migrate and rest of the stuff will be handled by heroku itself.
Also your database.yml should be changed to following for Production env.
production:
<<: *default
database: myapp_production
username: myapp
password: <%= ENV['MYAPP_DATABASE_PASSWORD'] %>
Also your rails app is by default assigned with a Postgres addon.
You can check this by running command heroku addons in the console.
Source -
Heroku Getting Started Guide
Heroku Postgres Addon Guide

Answer 2

You cannot create a database on Heroku using db:create (you cannot drop it neither). Your database is created when you add an add-on (such as Heroku Postgres). You can only migrate and seed. And if you want to start over, you can use pg:reset (instead of drop and create)
So the correct sequence should be:
add the Heroku add-on (such as Heroku Postgres). Add-ons are located here: https://elements.heroku.com/addons.
rake db:migrate
rake db:seed
if you want to start over
rake pg:reset
rake db:migrate
rake db:seed
From Heroku documentation: https://devcenter.heroku.com/articles/heroku-postgresql
The PostgreSQL user your database is assigned doesn’t have permission to create or drop databases. To drop and recreate your database use pg:reset.

Answer 3

As per the given stacktrace, it seems like you are trying to create a database on heroku which in turn is giving you Permission Denied Error.
Firstly, you do not need to run
heroku run rake db:create
Instead run
heroku run rake db:migrate
and it should migrate the migrations which are down.
For checking the current status of migrations run the following command:
heroku run rake db:migrate:status
Other Point you mentioned:
-> I can't create or seed any data in the database
As already mentioned above you can't create a database as heroku does it for you .
For seeding data in the database run the following command:
heroku run rake db:seed