title: Render controller action from another controller
body: <p>I think the code is more explicit</p>
  
  <h1>option A</h1>
  
  <pre><code>class RedirectController &lt; ApplicationController
    def index
      redirect_to :controller =&gt; 'posts', :action =&gt; 'show', :id =&gt; 1
      # it works
    end
  end
  </code></pre>
  
  <h1>option B</h1>
  
  <pre><code>class RedirectController &lt; ApplicationController
    def index
      render :controller =&gt; 'posts', :action =&gt; 'show', :id =&gt; 1
      # it doesn't work
    end
  end
  </code></pre>
  
  <p>Is possible in (B) to load another action in another controller? (and not just the view) How?
  Thanks </p>