How to use PostgreSQL instead of SQLite with Ruby on Rails

Assuming that you have Rails and PostgreSQL already installed on your workstation, follow the steps for a new or existing Ruby on Rails app according to your needs.

Use PostgresSQL with a new Rails app

Run the following command to create a new Ruby on Rails app using PostgresSQL adapter:


rails new myapp --database=postgresql

Now, switch into the newly created app directory and run in the terminal:


rake db:create

Add PostgreSql to an existing Ruby on Rails app

Add the following line to your gemfile, then run bundle install


gem 'pg'

Update the file config/database.yml to match the below code. Replace "exampleapp" instances with the name of your app.


default: &default

  adapter: postgresql

  encoding: unicode

  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>



development:

  <<: *default

  database: exampleapp_development



test:

  <<: *default

  database: exampleapp_test



production:

  <<: *default

  database: exampleapp_production

  username: exampleapp

  password: <%= ENV['EXAMPLEAPP_DATABASE_PASSWORD'] %>

You will need to then recreate your database by running the following:


rake db:drop db:create db:migrate

As a shortcut, you can run the migrate reset command instead


rake db:migrate:reset

If you have a seed file, use this instead:


rake db:drop db:setup

As a shortcut, you can run the reset command instead


rake db:reset

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