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libraries/fof30/Model/DataModel/Behaviour/EmptyNonZero.php

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+<?php
+/**
+ * @package   FOF
+ * @copyright Copyright (c)2010-2021 Nicholas K. Dionysopoulos / Akeeba Ltd
+ * @license   GNU General Public License version 2, or later
+ */
+
+namespace FOF30\Model\DataModel\Behaviour;
+
+defined('_JEXEC') || die;
+
+use FOF30\Event\Observer;
+use FOF30\Model\DataModel;
+use JDatabaseQuery;
+
+/**
+ * FOF model behavior class to let the Filters behaviour know that zero value is a valid filter value
+ *
+ * @since    2.1
+ */
+class EmptyNonZero extends Observer
+{
+	/**
+	 * This event runs after we have built the query used to fetch a record
+	 * list in a model. It is used to apply automatic query filters.
+	 *
+	 * @param   DataModel      &$model  The model which calls this event
+	 * @param   JDatabaseQuery &$query  The query we are manipulating
+	 *
+	 * @return  void
+	 */
+	public function onAfterBuildQuery(&$model, &$query)
+	{
+		$model->setBehaviorParam('filterZero', 1);
+	}
+}