title: Navigate nested has_many
body: <p>I have nested has_many associations</p>
  
  <p>Project has many Parts
  Part has many Tasks
  Task has many jobs</p>
  
  <p>Is there a better way to get all the jobs associated to a project than</p>
  
  <pre><code>project.parts.each do |p|
    p.tasks.each do |t|
      t.jobs.each do |j|
        ...
      end
    end
  end 
  </code></pre>
  
  <p>Thanks</p>