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.

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

Create Rails app

$ rails new chatty --database=postgresql

Set up db

$ be rake db:create

$ be rails generate scaffold Room topic:string

$ 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
Initialized empty Git repository in /Users/jay/Projects/codeschool/heroku/chatty/.git/
$ git commit -am "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

$ 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!