In 2009, I discovered Heroku service for building applications. Not long time ago was bought by Salesforce and it has expanded its list of programming languages including Java, Scala, Clojure and Node.js. It is extremely useful and extremely easy to use. It is also based in Git a SCM system which is also revolutionazing the version control systems.
To install Git, we could use this guide located on the Pro Git page or also you can see this page which explains how to use textmate with git
We set Git configuration:
$ git config --global user.name "Your Name" $ git config --global user.email firstname.lastname@example.org
There is a great Quickstart for using Heroku which I used as a base for this post: http://docs.heroku.com/quickstart . It explains how to:
- Sign in in Heroku
- Install Heroku
Install RVM, Gemsets, Rails, Heroku and Postgres SQL Database
Heroku has improved a lot its installation procedures and it provides now a packaged installer called Heroku Toolbelt. The Heroku Toolbelt runs over Ruby 1.9, since my Mac OS X Lion still use Ruby 1.8.7, it is recommended that we install the Ruby Version Manager.
Install the Ruby Version Manager
The Ruby Version Manager is a command-line tool that makes it easy to install and manage multiple independent Ruby environments on the same machine. The Ruby Version Manager compiles the Ruby from the source. We could install RVM from our MacOSX using the Ruby installed with the following command
user$ curl -L https://get.rvm.io | bash -s stable
rvm 1.14.10 (stable) by Wayne E. Seguin <email@example.com>, Michal Papis <firstname.lastname@example.org> [https://rvm.io/]
To start using RVM you need to run source /Users/
user$ rvm --version user$ rvm
Once installed, we display a list of all the existing “known” Rubies using the following commands:
user$ rvm list known
Heroku’s newest stack, “Celadon Cedar,” supports Ruby 1.9.3 and Rails 3.2. As of 9 May 2012, Heroku officially supports Ruby 1.9.3. To install a new version, we execute the following command:
user$ rvm install 1.9.3
This script will download, compile, and install the Ruby 1.9.3 into a directory managed by RVM (it’s under the ~/.rvm directory) different from the version installed in Mac OS X. To use this distribution, we execute the following command:
user$ rvm use 1.9.3 user$ Using /Users/gonzaloperezprim/.rvm/gems/ruby-1.9.3-p194
We check if it is working using the following command:
user$ ruby -v ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-darwin11.4.0]
user$ which ruby /Users/<userid>/.rvm/rubies/ruby-1.9.3-p194/bin/ruby
Generate RVM Gemsets to create independent Rails installations
As we said before, RVM gives you independent ruby setups. This means that ruby, gems and irb are all separate and self-contained – from the system, and from each other. You may even have separate named gem sets. We could list the existing gemsets available in the application with the following command:
user$ rvm gemset list gemsets for ruby-1.9.3-p194 (found in /Users/<userid>/.rvm/gems/ruby-1.9.3-p194) global
There is a global gem set. This global gemset contains gems that will be used across multiple projects, then a project-specific gemset for each of our Rails applications.
user$ rvm gemset use global Using ruby-1.9.3-p194 with gem set global user$ gem list *** LOCAL GEMS *** bundler (1.1.5) rake (0.9.2.2) rubygems-bundler (1.0.3) rvm (188.8.131.52)
Now we can create a new gem set:
We are going to create a gemset specifically for installing Rails 3.2 version.
user$ rvm gemset create rails3 'rails3' gemset created (/Users/<userid>/.rvm/gems/ruby-1.9.3-p194@rails3).
user$ rvm use 1.9.3@rails3 Using /Users/<userid>/.rvm/gems/ruby-1.9.3-p194 with gemset rails3
Install Rails Gem
To update rails, we update the RubyGems tool which is installed and then we install the Rails framework including dependencies but no including the documentation:
user$ gem update --system user$ gem install rails -v 3.2.6 --include-dependencies --no-rdoc --no-ri
We check that the sqlite3 database is installed
sqlite3 -version <pre lang="bash">user$ gem install sqlite3 --no-rdoc --no-ri
We are going to backup the gemset installed in the project, so we could export and then imported for keeping all the possible developers working in the same version.
user$ rvm gemset export rails.gems Exporting current environments gemset to rails.gems user$ cat rails.gems # rails.gems generated gem export file. Note that any env variable settings will be missing. Append these after using a ';' field separator
Once we have export the rails.gems file, after we install the rvm, create the ruby installation and the gemset, we could
user$ rvm gemset import rails.gems
Install Heroku Gem
Now, we install Heroku gem
user$ gem install heroku --include-dependencies --no-rdoc --no-ri
We try to access using our Heroku registration details, the email and the password:
user$heroku login Enter your Heroku credentials. Email: Password (typing will be hidden):
Create a Rails Application
Create the local application in your mac:
user$rails new myapp
Next, open your Gemfile and add the following lines:
group :production do
# go into the new project directory and create an .rvmrc for the gemset
$ rvm –rvmrc 1.9.3@awesome_rails_project
Access to the rails app: cd myapp
h3. Create first Heroku Entry
- Execute git: $ git init
- Do git add: $ git add .
- We access to the following command:
- Do git first commit:
$ git commit -m "new app"
- We open the application, and we start the local server ruby script/server and access to localserver using http://127.0.0.1:3000
- As usual, we generate a index or home controller. I generally call them dashboard as it is sexy: $ ruby script/generate controller dashboard index
- We delete the entry page: $ rm public/index.html
- We modify the config/routes.rb to enter the following route map:
- We create the heroku application directly on the heroku site from our computer merely using the Heroku’s gem
- Now the web site will be visible on the following address: http://severe-stone-45.heroku.com. Sustitute the name by the name provided by Heroku and you got it. As the heroku repository is blank when we create the application we need to deploy the code to a specific branch, we deploy the code throuh this instruction
$ rake db:create db/development.sqlite3 already exists
map.connect ':controller/:action/:id' map.connect ':controller/:action/:id.:format' # Enter the route to access to enter the dashboard map.root :controller => "dashboard"
heroku create Created http://severe-stone-45.heroku.com/ | email@example.com:severe-stone-45.git
$ git push heroku master