title: Uninitialized constant for my job ActiveJob
body: <p>I'm trying to learn ActiveJob and I created a simple job to walk through the process.  I'm pretty much stuck on step 1.  I've got a my_job.rb file in app/jobs.  That file contains this code:</p>
  
  <pre><code>class MyJob &lt; ActiveJob::Base
    queue_as :default
  
    def perform(obj)
      puts obj
    end
  end
  </code></pre>
  
  <p>If I go to my console and type in MyJob, it acts like the class doesn't exist...what am I missing?</p>
  
  <p>:001 > MyJob
  NameError: uninitialized constant MyJob</p>