recompiling database.yml file with gemfile? ruby on rails

Question

I'm new to Ruby on Rails and postgreSQL and had a question. Does the database.yml file get compiled when you run bundle install on a Gemfile? Initially my gemfile had sqlite3, but I changed it to pg and tried to run bundle install again to recompile the database.yml file, but the file still says it's using SQLite.

development:
adapter: sqlite3
database: db/development.sqlite3
pool: 5
timeout: 5000

I want the adapter to be switched to postgresql and I believe some other fields should be switched when using pg, but I'm unsure. Can anyone clarify this for me, thank you.

Answer 1

No, database.yml is not recompiled automatically. When you change the gem in Gemfile, you need to also change the file:

development:
  adapter: postgresql
  database: dbname
  username: user
  password: password
  encoding: unicode

Answer 2

you need to replace too your the adapter value in your config/database.yml

When you run bundle install it will install the gems declared in your Gemfile, but you must manually setup you database configuration. Bundle don't compile your anything on your application except the Gemfile.lock where are declared the gems versions.

Something like:

development:
  adapter: postgresql
  encoding: unicode
  database: myapp_development
  host: localhost
  password: password # if you need a password

test:
  adapter: postgresql
  encoding: unicode
  database: myapp_test
  host: localhost
  password: password # if you need a password

production:
  adapter: postgresql
  encoding: unicode
  database: myapp_production
  host: localhost
  password: password # probably you will need a password