Save a link to the latest activity value in the project model and

render a simple green bar as activity measure in the project list
view.

src/IDF/ProjectActivity.php

@@ -64,4 +64,15 @@ class IDF_ProjectActivity extends Pluf_Model
                                   ),
         );
     }
+
+    function postSave($create=false)
+    {
+        $prj = $this->get_project();
+        $sql = new Pluf_SQL('project=%s', array($prj->id));
+        $latest = Pluf::factory('IDF_ProjectActivity')->getOne(array('filter' => $sql->gen(), 'order' => 'date desc'));
+        if ($prj->current_activity != $latest->id) {
+            $prj->current_activity = $latest;
+            $prj->update();
+        }
+    }
 }