Little refactor plus some specs.

app/controllers/application_controller.rb

@@ -412,13 +412,7 @@ class ApplicationController < ActionController::Base
     controller_name = params[:controller].sub(/Controller\Z/, '').underscore
     cookie_suffix   = "_sort_#{controller_name}"
 
-    key = if @project
-            "#{@project.cookie_key}#{cookie_suffix}"
-          elsif @group
-            "#{@group.cookie_key}#{cookie_suffix}"
-          else
-            "#{current_user.cookie_key}#{cookie_suffix}"
-          end
+    key = "#{(@project || @group || current_user).cookie_key}#{cookie_suffix}"
 
     cookies[key]  ||= 'id_desc'
     cookies[key]  = params[:sort] if params[:sort].present?

features/dashboard/dashboard.feature

@@ -41,3 +41,19 @@ Feature: Dashboard
     And user with name "John Doe" left project "Shop"
     When I visit dashboard activity page
     Then I should see "John Doe left project Shop" event
+
+  @javascript
+  Scenario: Sorting Issues
+    Given I visit dashboard issues page
+    And I sort the list by "Oldest updated"
+    And I visit dashboard activity page
+    And I visit dashboard issues page
+    Then The list should be sorted by "Oldest updated"
+
+  @javascript
+  Scenario: Sorting Merge Requests
+    Given I visit dashboard merge requests page
+    And I sort the list by "Oldest updated"
+    And I visit dashboard activity page
+    And I visit dashboard merge requests page
+    Then The list should be sorted by "Oldest updated"

features/project/issues/issues.feature

@@ -59,6 +59,14 @@ Feature: Project Issues
     And I sort the list by "Last updated"
     Then I should see "Release 0.4" at the top
 
+  @javascript
+  Scenario: Visiting Issues after being sorted the list
+    Given I visit project "Shop" issues page
+    And I sort the list by "Oldest updated"
+    And I visit my project's home page
+    And I visit project "Shop" issues page
+    Then The list should be sorted by "Oldest updated"
+
   @javascript
   Scenario: I search issue
     Given I fill in issue search with "Re"

features/project/merge_requests.feature

@@ -84,6 +84,14 @@ Feature: Project Merge Requests
     And I sort the list by "Last updated"
     Then I should see "Bug NS-04" at the top
 
+  @javascript
+  Scenario: Visiting Merge Requests after being sorted the list
+    Given I visit project "Shop" merge requests page
+    And I sort the list by "Oldest updated"
+    And I visit my project's home page
+    And I visit project "Shop" merge requests page
+    Then The list should be sorted by "Oldest updated"
+
   @javascript
   Scenario: Visiting Merge Requests after commenting on diffs
     Given project "Shop" have "Bug NS-05" open merge request with diffs inside

features/steps/dashboard/dashboard.rb

@@ -2,6 +2,7 @@ class Spinach::Features::Dashboard < Spinach::FeatureSteps
   include SharedAuthentication
   include SharedPaths
   include SharedProject
+  include SharedIssuable
 
   step 'I should see "New Project" link' do
     expect(page).to have_link "New project"

features/steps/shared/issuable.rb

@@ -106,6 +106,19 @@ module SharedIssuable
     edit_issuable
   end
 
+  step 'I sort the list by "Oldest updated"' do
+    find('button.dropdown-toggle.btn').click
+    page.within('ul.dropdown-menu.dropdown-menu-align-right li') do
+      click_link "Oldest updated"
+    end
+  end
+
+  step 'The list should be sorted by "Oldest updated"' do
+    page.within('div.dropdown.inline.prepend-left-10') do
+      expect(page.find('button.dropdown-toggle.btn')).to have_content('Oldest updated')
+    end
+  end
+
   def create_issuable_for_project(project_name:, title:, type: :issue)
     project = Project.find_by(name: project_name)