group news by archive

src/DependencyInjection/ContaoNewsRelatedExtension.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace ContaoNewsRelatedBundle\DependencyInjection;
+
+use Symfony\Component\Config\FileLocator;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Extension\Extension;
+use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
+
+class ContaoNewsRelatedExtension extends Extension
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function load(array $configs, ContainerBuilder $container)
+    {
+        $loader = new YamlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
+        $loader->load('listener.yml');
+    }
+}

src/EventListener/NewsListener.php

@@ -0,0 +1,42 @@
+<?php
+
+namespace ContaoNewsRelatedBundle\EventListener;
+
+use Contao\DataContainer;
+use Contao\NewsModel;
+
+class NewsListener
+{
+	/**
+	 * Options callback for the related news selection.
+	 *
+	 * @param DataContainer $dc
+	 *
+	 * @return array
+	 */
+	public function relatedNewsOptionsCallback(DataContainer $dc)
+	{
+		$t = NewsModel::getTable();
+		$objNews = NewsModel::findAll(['order' => "$t.headline ASC"]);
+
+		$arrOptions = [];
+		foreach ($objNews as $news)
+		{
+			// skip self
+			if ('tl_news' == $dc->table && $dc->activeRecord && isset($dc->activeRecord->id) && $dc->activeRecord->id == $news->id)
+			{
+				continue;
+			}
+			if ('tl_news' == $dc->parentTable && $dc->activeRecord->pid == $news->id)
+			{
+				continue;
+			}
+
+			$arrOptions[$news->getRelated('pid')->title][$news->id] = $news->headline;
+		}
+
+		ksort($arrOptions);
+
+		return $arrOptions;
+	}
+}

src/Resources/config/listener.yml

@@ -0,0 +1,3 @@
+services:
+    contao_newsrelated.listener.news:
+        class: ContaoNewsRelatedBundle\EventListener\NewsListener

src/Resources/contao/dca/tl_news.php

@@ -17,6 +17,7 @@
 	'label'                   => &$GLOBALS['TL_LANG']['tl_news']['relatedNews'],
 	'exclude'                 => true,
 	'inputType'               => 'select',
+	'options_callback'        => array('ContaoNewsRelatedBundle\EventListener\NewsListener', 'relatedNewsOptionsCallback'),
 	'foreignKey'              => 'tl_news.headline',
 	'eval'                    => array('multiple'=>true, 'chosen'=>true, 'tl_style'=>'height:auto', 'tl_class'=>'clr'),
 	'relation'                => array('type'=>'belongsToMany', 'load'=>'lazy'),