Ruby on Rails

On Friday, February 20, 2015 at 11:50:50 PM UTC, Jason Hsu, Rubyist wrote:
> As you know, Heroku uses the PostgreSQL database by default.
>
> However, when you deploy an app that you created with the use of SQLite in the development environment, the config/database.yml file on the Heroku server is still configured for SQLite.
>
> Exactly how does Heroku make the config/database.yml file relevant?  How does the app get the database name, username, and password in the Heroku environment?

On older rails versions heroku entirely rewrites the database.yml file. On rails 4.2 it doesn't need to because rails will use a DATABASE_URL environment variable if it is set. See https://devcenter.heroku.com/articles/heroku-postgresql#connecting-in-ruby for more details

Fred

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