Save Team View's department ID in session

So transition between pages does not reset selected value.

lib/route/calendar.js

@@ -138,13 +138,9 @@ router.get('/teamview/', async (req, res) => {
     : user.company.get_today();
 
   const grouped_mode = getGroupedModeParameter(req);
-
+  const currentDepartmentId = getDepartmentIdForTeamView(req);
   const team_view = new TeamView({ user, base_date });
 
-  const currentDepartmentId = validator.isNumeric(req.query['department'])
-    ? req.query['department']
-    : null;
-
   try {
     const [team_view_details, company] = await Promise.all([
       team_view.promise_team_view_details({
@@ -214,6 +210,27 @@ const getGroupedModeParameter = (req) => {
   return groupedMode
 };
 
+const getDepartmentIdForTeamView = (req) => {
+  /**
+   * department parameter is saved in the current session so user's
+   * transition between different pages does not reset the value
+   */
+  let departmentId = validator.isNumeric(req.query['department'])
+    ? req.query['department']
+    : null;
+
+  if (req.query['save_current_department']) {
+    req.session.teamViewDepartmentId = departmentId
+  } 
+
+  // for cases when no grouped_mode parameter was supplied: used onf from session
+  if (req.query['department'] === undefined) {
+    departmentId = req.session.teamViewDepartmentId
+  }
+
+  return departmentId
+}
+
 const groupUsersOnTeamViewByDepartments = (usersAndLeaves) => {
   const departmentsDict = usersAndLeaves.reduce(
     (acc, item) => ({ ...acc, [item.user.department.id]: { departmentName: item.user.department.name, users_and_leaves: [] } }),

views/partials/team_view_url_parameters.hbs

@@ -2,3 +2,4 @@
 {{~#if base_date }}date={{ as_date_formatted base_date 'YYYY-MM' }}&{{/if~}}
 {{~#if grouped_mode }}grouped_mode={{grouped_mode}}&{{/if~}}
 {{~#if save_grouped_mode}}save_grouped_mode=1&{{/if~}}
+{{~#if save_current_department}}save_current_department=1&{{/if~}}

views/team_view.hbs

@@ -7,8 +7,8 @@
   <div class="col-md-6 lead">{{logged_user.name}} {{logged_user.lastname}}'s team <a href="/calendar/feeds/" data-toggle="tooltip" data-placement="right" title="Export Team View to external calendars"><span class="fa fa-rss"></span></a></div>
   <div class="col-md-3 col-md-offset-3">
     <div class="btn-group btn-group-sm pull-right" role="group">
-      <a href="/calendar/teamview/?{{> team_view_url_parameters grouped_mode = 0 save_grouped_mode = 1 }}" class="btn btn-default" {{#unless grouped_mode}}disabled=disabled{{/unless}}>All</a>
-      <a href="/calendar/teamview/?{{> team_view_url_parameters grouped_mode = 1 save_grouped_mode = 1 }}" class="btn btn-default" {{#if grouped_mode}}disabled=disabled{{/if}}>By department</a>
+      <a href="/calendar/teamview/?{{> team_view_url_parameters grouped_mode = 0 save_grouped_mode = 1 save_current_department = 1 }}" class="btn btn-default" {{#unless grouped_mode}}disabled=disabled{{/unless}}>All</a>
+      <a href="/calendar/teamview/?{{> team_view_url_parameters grouped_mode = 1 save_grouped_mode = 1 save_current_department = 1 }}" class="btn btn-default" {{#if grouped_mode}}disabled=disabled{{/if}}>By department</a>
     </div>
   </div>
 </div>
@@ -105,10 +105,10 @@
               <span class="caret"></span>
             </button>
             <ul class="dropdown-menu" aria-labelledby="dropdownMenu1">
-              <li><a href="?{{> team_view_url_parameters current_department = null }}">All</a></li>
+              <li><a href="?{{> team_view_url_parameters current_department = null save_current_department = 1 }}">All</a></li>
               <li role="separator" class="divider"></li>
               {{#each related_departments}}
-              <li><a href="?{{> team_view_url_parameters base_date = ../base_date current_department = this }}">{{this.name}}</a></li>
+              <li><a href="?{{> team_view_url_parameters base_date = ../base_date current_department = this save_current_department = 1 }}">{{this.name}}</a></li>
               {{/each}}
             </ul>
           </div>