Store board collapsed mode user preference in the database

app/Controller/BoardAjaxController.php

@@ -4,6 +4,7 @@ namespace Kanboard\Controller;
 
 use Kanboard\Core\Controller\AccessForbiddenException;
 use Kanboard\Formatter\BoardFormatter;
+use Kanboard\Model\UserMetadataModel;
 
 /**
  * Class BoardAjaxController
@@ -88,7 +89,7 @@ class BoardAjaxController extends BaseController
      */
     public function collapse()
     {
-        $this->changeDisplayMode(true);
+        $this->changeDisplayMode(1);
     }
 
     /**
@@ -98,19 +99,19 @@ class BoardAjaxController extends BaseController
      */
     public function expand()
     {
-        $this->changeDisplayMode(false);
+        $this->changeDisplayMode(0);
     }
 
     /**
      * Change display mode
      *
      * @access private
-     * @param  boolean $mode
+     * @param  int $mode
      */
     private function changeDisplayMode($mode)
     {
         $project_id = $this->request->getIntegerParam('project_id');
-        $this->userSession->setBoardDisplayMode($project_id, $mode);
+        $this->userMetadataCacheDecorator->set(UserMetadataModel::KEY_BOARD_COLLAPSED.$project_id, $mode);
 
         if ($this->request->isAjax()) {
             $this->response->html($this->renderBoard($project_id));

app/Core/User/UserSession.php

@@ -179,28 +179,4 @@ class UserSession extends Base
     {
         $this->sessionStorage->filters[$project_id] = $filters;
     }
-
-    /**
-     * Is board collapsed or expanded
-     *
-     * @access public
-     * @param  integer  $project_id
-     * @return boolean
-     */
-    public function isBoardCollapsed($project_id)
-    {
-        return ! empty($this->sessionStorage->boardCollapsed[$project_id]) ? $this->sessionStorage->boardCollapsed[$project_id] : false;
-    }
-
-    /**
-     * Set board display mode
-     *
-     * @access public
-     * @param  integer  $project_id
-     * @param  boolean  $is_collapsed
-     */
-    public function setBoardDisplayMode($project_id, $is_collapsed)
-    {
-        $this->sessionStorage->boardCollapsed[$project_id] = $is_collapsed;
-    }
 }

app/Helper/BoardHelper.php

@@ -3,6 +3,7 @@
 namespace Kanboard\Helper;
 
 use Kanboard\Core\Base;
+use Kanboard\Model\UserMetadataModel;
 
 /**
  * Board Helper
@@ -21,6 +22,6 @@ class BoardHelper extends Base
      */
     public function isCollapsed($project_id)
     {
-        return $this->userSession->isBoardCollapsed($project_id);
+        return $this->userMetadataCacheDecorator->get(UserMetadataModel::KEY_BOARD_COLLAPSED.$project_id, 0) == 1;
     }
 }

app/Model/UserMetadataModel.php

@@ -11,6 +11,7 @@ namespace Kanboard\Model;
 class UserMetadataModel extends MetadataModel
 {
     const KEY_COMMENT_SORTING_DIRECTION = 'comment.sorting.direction';
+    const KEY_BOARD_COLLAPSED = 'board.collapsed.';
 
     /**
      * Get the table