Allow DI of database object (see https://github.com/joomla/joomla-cms/pull/4992)

src/com_weblinks/admin/models/weblink.php

@@ -248,7 +248,7 @@ class WeblinksModelWeblink extends JModelAdmin
 			// Set ordering to the last item if not set
 			if (empty($table->ordering))
 			{
-				$db = JFactory::getDbo();
+				$db = $this->getDbo();
 				$query = $db->getQuery(true)
 					->select('MAX(ordering)')
 					->from($db->quoteName('#__weblinks'));