Issue system: adapted to work with multiple apps per fehler

application/models/system/Fehler_model.php

@@ -12,4 +12,41 @@ class Fehler_model extends DB_Model
 		$this->pk = array('fehlercode');
 		$this->hasSequence = false;
 	}
+
+	/**
+	 * Gets all fehler for particular apps.
+	 * @param $apps string of one app or array with multiple
+	 * @return object success or error
+	 */
+	public function getByApps($apps)
+	{
+		if (is_string($apps)) $apps = [$apps];
+
+		$params = [];
+
+		$qry = "
+			SELECT
+				fehlercode, fehler_kurzbz, fehlercode_extern, fehlertext, fehlertyp_kurzbz
+			FROM
+				system.tbl_fehler fe";
+
+		if (!isEmptyArray($apps))
+		{
+			$qry .= "
+				WHERE EXISTS (
+					SELECT 1
+					FROM
+						system.tbl_fehler_app
+					WHERE
+						fehlercode = fe.fehlercode
+						AND app IN ?
+				)";
+
+			$params[] = $apps;
+		}
+
+		$qry .= " ORDER BY fehlercode;";
+
+		return $this->execReadOnlyQuery($qry, $params);
+	}
 }