title: Heroku Rails deployment successful but Application Error
body: <p><strong>*Edited</strong></p>
  
  <p>In trying to deploy my Rails 4 app onto Heroku, I kept getting error messages even though my deployment was successful. I also needed to translate my app from using sqlite3 to postgres (edits to database.yml) What helped me was running:</p>
  
  <pre><code>heroku logs -- myAppName
  </code></pre>
  
  <p>where as before, I was only doing:</p>
  
  <pre><code>heroku logs
  </code></pre>
  
  <p>An error I got was a MissingTemplate.
  I found that I needed to update my production.rb file to include:</p>
  
  <pre><code>config.assets.compile = true
  </code></pre>
  
  <p>and in my <strong>Gemfile</strong></p>
  
  <pre><code>group :production, :staging do
      gem 'haml'
      gem 'rails_12factor'
  end
  </code></pre>