1. Navigate to your git repository from your computer
2. Open Gemfile then change gem ‘sqlite3’ to gem ‘pg’
3. Run the command: “bundle install”
4. Ensure the config/database.yml is using the postgresql adapter. by changing all “sqlite3” instance to “postgresql”
5. At the end of Gemfile add:
   ruby “2.3.1”
   – or check version using ruby -v
6. Login to your heroku account
   $ heroku login
7. Create a project, CD to where your git project is located in your local computer then type in:
   $ heroku create
   – prepares Heroku to receive your source code.
8. deploy your code by running the command:
   $ git push heroku master
9. The application is now deployed. Ensure that at least one instance of the app is running:
   $ heroku ps:scale web=1
10. Run the database migration:
    $ heroku run rake db:migrate
11. Now visit the app at the URL generated by its app name. As a handy shortcut, you can open the website as follows:
    heroku open
12. Do mongodb installation, see instructions bellow:

Installing mongodb Add-on

1. Run the command: heroku addons:create mongolab:sandbox
2. Run the command bellow to ensure we have MONGO_URI on our heroku config:
   $ heroku config
   It shows something like this:
   MONGODB_URI: mongodb://heroku_1c3dj371:6ncboo79ofhq5kg49ugiihe5th@ds035856.mlab.com:35856/heroku_1c3dj371
3. Add production DB connection in your config/mongoid.yml:

   1 2 3 4 5 6 7

   production:     clients:         default:             uri: <%= ENV['MONGODB_URI'] %>         options:             skip_version_check: true         safe: true

4. Commit and push your code to heroku.

To commit a code to Heroku

• Almost every deploy to Heroku follows this same pattern. First, add the modified files to the local git repository:
  $ git add .
• Now commit the changes to the repository:
  $ git commit -m “Demo”
• Now deploy, just as you did previously:
  $ git push heroku master
• Finally, check that everything is working:
  $ heroku open

Others Notes

1. You can view information about your running app using one of the logging commands in real time using:
   $ heroku logs –tail
2. If you changed the name of your heroku app from heroku website, you can
   perform the following command to update your local git project connection
   1. $ git remote rm heroku
   2. $ heroku git:remote -a NEW_NAME_OF_YOUR_APP