title: Heroku db:migrate and faker
body: <p>After <code>heroku rake db:migrate</code> I get the following error:</p>
  
  <pre><code>rake aborted!
  
  no such file to load -- faker
  
  /app/Rakefile:7
  
  (See full trace by running task with --trace)
  
  (in /app)*
  </code></pre>
  
  <p>I saw previous answers and I tried to shift <code>require 'faker'</code> from the first line to the line below <code>task :populate =&gt; :environment do</code> in my <code>sample_data.rake</code> file. It didn't work.</p>
  
  <p>I commented <code>faker</code> in the gemfile (and it was present only in the dev environment) and I executed a <code>bundle install</code>. It didn't work.</p>
  
  <p>I'm really scared about the fact that I can't use faker with heroku. Could you please help me?</p>