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    <p>As shown in <a href="http://symfony.com/doc/current/cookbook/controller/error_pages.html">the Symfony Cookbook</a> you can override error pages in two ways:</p> <ul> <li>Overriding the templates</li> <li>Using a custom exception controller</li> </ul> <p>If you only want to show the <code>/sitemap</code> route on a 404 (<code>HttpNotFoundException</code>) exception you could override the Twig exception template by creating a new template in <code>app/Resources/TwigBundle/views/Exception/error404.html.twig</code>.</p> <p>Another way that is not shown in the cookbook is using an event listener. When the kernel encounters an exception, a <a href="http://symfony.com/doc/2.0/book/internals.html#kernel-exception-event"><code>kernel.exception</code></a> event is dispatched. By default, this exception is caught by the exception listening provided by Twig. You can <a href="http://symfony.com/doc/master/cookbook/service_container/event_listener.html">create your own event listener</a> which listens for the <code>kernel.exception</code> event and renders a page:</p> <pre><code>&lt;?php use Symfony\Component\HttpKernel\Exception\NotFoundHttpException; use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent; use Symfony\Component\HttpFoundation\Response; public function onKernelException(GetResponseForExceptionEvent $event) { if ($event-&gt;getException() instanceof NotFoundHttpException) { $response = $this-&gt;templating-&gt;renderResponse(/* sitemap */); $event-&gt;setResponse($response) } } </code></pre> <p>(I haven't tested this code, so you should try it yourself! And you have to inject the templating service into the event listener yourself, of course).</p>
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    1. COThanks, the event listener is the way to go I think, but $this->templating isn't valid. I've also tried $event->templating. I don't think usual controller methods are available. I get a Undefined property: Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent::$templating in...
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    2. COYou're correct, the usual controller methods are not available as those are aliases for method calls on services. You should inject the `templating` service into the event listener yourself in the service description.
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    3. COI didn't realist at the time this just sets a Twig template, not an actually page or controller.
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

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