Ch Suparerk suparerk

## Procfile
web: bundle exec rails s
webpacker: NODE_ENV=production ./bin/webpack --watch --colors --progress

## sql_to_activerecord_example.rb
query = "SELECT Sum(score) AS score,
      Sum(range) AS range
FROM   best_results br
      JOIN chapters c
        ON br.chapter_id = c.id
      JOIN lessons l
        ON c.lesson_id = l.id
      JOIN units u
        ON l.unit_id = u.id
WHERE  br.user_id = '#{user.id}'

## rails-postgres-backbone-bootstrap-bootswatch
- Check rails version
$ rails -v

- To update rails
$ gem update rails

- Creating a new rails app using postgresql
$ mkdir rails_projects
$ cd rails_projects
$ rails new myapp --database=postgresql
	web: bundle exec rails s
	webpacker: NODE_ENV=production ./bin/webpack --watch --colors --progress
	query = "SELECT Sum(score) AS score,
	Sum(range) AS range
	FROM best_results br
	JOIN chapters c
	ON br.chapter_id = c.id
	JOIN lessons l
	ON c.lesson_id = l.id
	JOIN units u
	ON l.unit_id = u.id
	WHERE br.user_id = '#{user.id}'
	- Check rails version
	$ rails -v

	- To update rails
	$ gem update rails

	- Creating a new rails app using postgresql
	$ mkdir rails_projects
	$ cd rails_projects
	$ rails new myapp --database=postgresql