Prevent people to remove columns that contains tasks

app/Model/ColumnModel.php

@@ -120,6 +120,24 @@ class ColumnModel extends Base
         return $this->db->table(self::TABLE)->eq('project_id', $project_id)->asc('position')->findAll();
     }
 
+    /**
+     * Get all columns with tasks count
+     *
+     * @access public
+     * @param  integer  $project_id   Project id
+     * @return array
+     */
+    public function getAllWithTasksCount($project_id)
+    {
+        return $this->db->table(self::TABLE)
+            ->columns('id', 'title', 'position', 'task_limit', 'description', 'hide_in_dashboard', 'project_id')
+            ->subquery('SELECT COUNT(*) FROM '.TaskModel::TABLE.' WHERE column_id='.self::TABLE.'.id AND is_active=1', 'nb_open_tasks')
+            ->subquery('SELECT COUNT(*) FROM '.TaskModel::TABLE.' WHERE column_id='.self::TABLE.'.id AND is_active=0', 'nb_closed_tasks')
+            ->eq('project_id', $project_id)
+            ->asc('position')
+            ->findAll();
+    }
+
     /**
      * Get the list of columns sorted by position [ column_id => title ]
      *