Add subject filter to question sets

administrator/components/com_testquestions/src/Model/SetsModel.php

@@ -14,6 +14,7 @@ class SetsModel extends ListModel
         parent::populateState($ordering, $direction);
         $this->setState('filter.search', $this->getUserStateFromRequest($this->context . '.filter.search', 'filter_search', '', 'string'));
         $this->setState('filter.published', $this->getUserStateFromRequest($this->context . '.filter.published', 'filter_published', '', 'string'));
+        $this->setState('filter.subject_id', $this->getUserStateFromRequest($this->context . '.filter.subject_id', 'filter_subject_id', '', 'int'));
     }
 
     protected function getListQuery()
@@ -36,6 +37,23 @@ class SetsModel extends ListModel
             $query->where('s.published = ' . (int) $published);
         }
 
+        if ((int) $this->getState('filter.subject_id') > 0) {
+            $query->where('s.subject_id = ' . (int) $this->getState('filter.subject_id'));
+        }
+
         return $query->order('s.ordering ASC, s.title ASC');
     }
+
+    public function getSubjects()
+    {
+        $db = Factory::getContainer()->get('DatabaseDriver');
+
+        return $db->setQuery(
+            $db->getQuery(true)
+                ->select(['id', 'title'])
+                ->from($db->quoteName('#__testquestions_subjects'))
+                ->where($db->quoteName('published') . ' = 1')
+                ->order($db->quoteName('title') . ' ASC')
+        )->loadObjectList();
+    }
 }

administrator/components/com_testquestions/src/View/Sets/HtmlView.php

@@ -14,12 +14,14 @@ class HtmlView extends BaseHtmlView
     protected $items;
     protected $pagination;
     protected $state;
+    protected $subjects;
 
     public function display($tpl = null)
     {
         $this->items = $this->get('Items');
         $this->pagination = $this->get('Pagination');
         $this->state = $this->get('State');
+        $this->subjects = $this->get('Subjects');
 
         if (count($errors = $this->get('Errors'))) {
             throw new \RuntimeException(implode("\n", $errors));