Make sorting preference reusable for all projects.

app/controllers/application_controller.rb

@@ -409,13 +409,22 @@ class ApplicationController < ActionController::Base
   private
   def set_default_sort
-    # Use the controller name so we have a distinct cookie for Issues, MRs and Dashboard
-    cookie_suffix   = "_sort_#{params[:controller].underscore}"
-    key = "#{(@project || @group || current_user).cookie_key}#{cookie_suffix}"
-    cookies[key]  ||= 'id_desc'
-    cookies[key]  = params[:sort] if params[:sort].present?
-    params[:sort] = cookies[key]
+    key = if is_a_listing_page_for?('issues')
+            'issues_sort'
+          elsif is_a_listing_page_for?('merge_requests')
+            'merge_requests_sort'
+          end
+
+    cookies[key]  = params[:sort] if key && params[:sort].present?
+    params[:sort] = cookies[key] if key
+    params[:sort] ||= 'id_desc'
+  end
+  def is_a_listing_page_for?(page_type)
+    controller_name, action_name = params.values_at(:controller, :action)
+    (controller_name == "projects/#{page_type}" && action_name == 'index') ||
+    (controller_name == 'groups' && action_name == page_type) ||
+    (controller_name == 'dashboard' && action_name == page_type)
   end
 end

app/models/concerns/cookie_helpers.rb

-module CookieHelpers
-  def cookie_key
-    "#{model_name.singular}_#{id}"
-  end
-end

app/models/group.rb

@@ -19,7 +19,6 @@ require 'file_size_validator'
 class Group < Namespace
   include Gitlab::ConfigHelper
   include Referable
-  include CookieHelpers
   has_many :group_members, dependent: :destroy, as: :source, class_name: 'GroupMember'
   alias_method :members, :group_members

app/models/project.rb

@@ -51,7 +51,6 @@ class Project < ActiveRecord::Base
   include AfterCommitQueue
   include CaseSensitivity
   include TokenAuthenticatable
-  include CookieHelpers
   extend Gitlab::ConfigHelper

app/models/user.rb

@@ -73,7 +73,6 @@ class User < ActiveRecord::Base
   include Sortable
   include CaseSensitivity
   include TokenAuthenticatable
-  include CookieHelpers
   add_authentication_token_field :authentication_token

features/dashboard/dashboard.feature

@@ -50,6 +50,13 @@ Feature: Dashboard
     And I visit dashboard issues page
     Then The list should be sorted by "Oldest updated"
+  @javascript
+  Scenario: Visiting Project's issues after sorting
+    Given I visit dashboard issues page
+    And I sort the list by "Oldest updated"
+    And I visit project "Shop" issues page
+    Then The list should be sorted by "Oldest updated"
+
   @javascript
   Scenario: Sorting Merge Requests
     Given I visit dashboard merge requests page
@@ -57,3 +64,10 @@ Feature: Dashboard
     And I visit dashboard activity page
     And I visit dashboard merge requests page
     Then The list should be sorted by "Oldest updated"
+
+  @javascript
+  Scenario: Visiting Project's merge requests after sorting
+    Given I visit dashboard merge requests page
+    And I sort the list by "Oldest updated"
+    And I visit project "Shop" merge requests page
+    Then The list should be sorted by "Oldest updated"

features/project/issues/issues.feature

@@ -67,6 +67,13 @@ Feature: Project Issues
     And I visit project "Shop" issues page
     Then The list should be sorted by "Oldest updated"
+  @javascript
+  Scenario: Visiting Merge Requests from a differente Project after sorting
+    Given I visit project "Shop" merge requests page
+    And I sort the list by "Oldest updated"
+    And I visit dashboard merge requests 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

@@ -92,6 +92,13 @@ Feature: Project Merge Requests
     And I visit project "Shop" merge requests page
     Then The list should be sorted by "Oldest updated"
+  @javascript
+  Scenario: Visiting Merge Requests from a differente Project after sorting
+    Given I visit project "Shop" merge requests page
+    And I sort the list by "Oldest updated"
+    And I visit dashboard 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