title: Rails: how to generate view/action to existing controller?
body: <p>When I want to add a custome view to my existing controller
  I need to create the <code>custom_page.erb</code>, add the <code>def custom_page</code> in <code>controller</code>, and add routes <code>get ...</code>. This is very repetative.</p>
  
  <p>Is there any <code>generate command</code>, that can do this at once? Maybe something like <code>Rails generate CustomActionToMyController action_name</code>?</p>