Description

Heroku is a simple way to publish your Rails app, and a powerful platform that will allow it to scale. In this episode, Jay McGavren gets you started with your first Heroku app. http://www.codeschool.com/code_tv/heroku

Set up your Rails app

Isolate your gem environment

You WANT Rails to fail locally if a gem isn't in your Gemfile
Otherwise you're in for a surprise when it's missing on Heroku

$ alias be='bundle exec'

Install Postgresql

http://www.postgresql.org

$ sudo apt-get install libpq-dev postgresql

Create Rails app

$ rails new chatty --database=postgresql

Setup user in postgresql

$ sudo -u postgres createuser -D -P chatty
Enter password for new role: secretpassword
Enter it again: secretpassword
Shall the new role be a superuser? (y/n) y

I had to also modify the postgresql pg_hba.conf http://blog.deliciousrobots.com/2011/12/13/get-postgres-working-on-ubuntu-or-linux-mint/

Edit database.yml

add your password

Create up db and table

$ cd chatty

$ be rake db:create

$ be rails generate scaffold Room topic:string
invoke  active_record
create    db/migrate/20120715151208_create_rooms.rb

$ be rake db:migrate
==  CreateRooms: migrating ====================================================
-- create_table(:rooms)
NOTICE:  CREATE TABLE will create implicit sequence "rooms_id_seq" for serial column "rooms.id"
NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "rooms_pkey" for table "rooms"
   -> 0.1256s
==  CreateRooms: migrated (0.1258s) ===========================================

Set up Git

$ git init && git add . && git commit -m "Initial commit."
Initialized empty Git repository in /Users/jay/Projects/codeschool/heroku/chatty/.git/
# On branch master
#
# Initial commit

Set up Heroku

Create an account

https://api.heroku.com/signup

Download Heroku Toolbelt

https://toolbelt.herokuapp.com/

Set up Toolbelt credentials

$ heroku login
Enter your Heroku credentials.
Email: [email protected]
Password: 
Authentication successful.

Create Heroku App

$ heroku create --stack cedar
Creating gentle-river-1475... done, stack is cedar
http://gentle-river-1475.herokuapp.com/ | [email protected]:gentle-river-1475.git
Git remote heroku added

Change [email protected]:gentle-river-1475.git to the address given you when the command above was ran.

$ cat .git/config 
[core]
  ...
[remote "heroku"]
  url = [email protected]:gentle-river-1475.git
  fetch = +refs/heads/*:refs/remotes/heroku/*

$ git push heroku master

$ open http://gentle-river-1475.herokuapp.com/

Troubleshooting

Processes

$ heroku ps

Logs

$ heroku logs

Run tasks on server

$ heroku run rake db:migrate

Console

$ heroku run console

Config

Add S3 gem

gem 'aws-s3'

Embed video

<video controls width="512" height="288">
  <source 
    src="<%= AWS::S3::S3Object.url_for('demo.mp4', 'codetv-heroku1') %>"
    type="video/mp4"
  />
</video>

Don't do this!

config/initializers/s3.rb

require 'aws/s3'

AWS::S3::Base.establish_connection!(
  :access_key_id     => 'THISISSUPPOSEDTOBESECRET',
  :secret_access_key => 'DONTCOMMITTHISTOGITNOMATTERWHAT'
)

Do this!