Create a new MySQL database for a Rails application

To create a new MySQL database for a Rails application:

• Start the MySQL command line client, as shown below. Enter the password for the MySQL root user.

  $ mysql -u root -p
  

• At the MySQL prompt, run the following commands. Remember to replace the DBNAME, APPNAME and PASSWORD placeholders with actual values for your database name, application name and database user password.

  mysql> CREATE DATABASE IF NOT EXISTS DBNAME_production;
  mysql> CREATE DATABASE IF NOT EXISTS DBNAME_development;
  mysql> CREATE DATABASE IF NOT EXISTS DBNAME_test;
  mysql> GRANT ALL PRIVILEGES on DBNAME_test.* to 'APPNAME'@'localhost' identified by 'PASSWORD';
  mysql> GRANT ALL PRIVILEGES on DBNAME_production.* to 'APPNAME'@'localhost';
  mysql> GRANT ALL PRIVILEGES on DBNAME_development.* to 'APPNAME'@'localhost';
  mysql> FLUSH PRIVILEGES;
  

• Edit the config/database.yml file in your Rails project directory and update the database configuration. You can also copy the database.yml file from a sample or fresh project and modify the database details as needed:

  default: &default
    adapter: mysql
    pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
    username: APPNAME
    password: PASSWORD
    host: localhost
  
  development:
    <<: *default
    database: APPNAME_development
  
  test:
    <<: *default
    database: APPNAME_test
  
  production:
    <<: *default
    database: APPNAME_production