Include new URL helpers retroactively into includers of Gitlab::Routing

app/models/project_services/gitlab_issue_tracker_service.rb

 class GitlabIssueTrackerService < IssueTrackerService
-  include Gitlab::Routing.url_helpers
+  include Gitlab::Routing
   validates :project_url, :issues_url, :new_issue_url, presence: true, url: true, if: :activated?

app/models/project_services/jira_service.rb

 class JiraService < IssueTrackerService
-  include Gitlab::Routing.url_helpers
+  include Gitlab::Routing
   validates :url, url: true, presence: true, if: :activated?
   validates :api_url, url: true, allow_blank: true

app/services/chat_names/authorize_user_service.rb

 module ChatNames
   class AuthorizeUserService
-    include Gitlab::Routing.url_helpers
+    include Gitlab::Routing
     def initialize(service, params)
       @service = service

config/application.rb

@@ -166,9 +166,10 @@ module Gitlab
     config.after_initialize do
       Rails.application.reload_routes!
-      named_routes_set = Gitlab::Application.routes.named_routes
       project_url_helpers = Module.new do
-        named_routes_set.helper_names.each do |name|
+        extend ActiveSupport::Concern
+
+        Gitlab::Application.routes.named_routes.helper_names.each do |name|
           next unless name.include?('namespace_project')
           define_method(name.sub('namespace_project', 'project')) do |project, *args|
@@ -177,14 +178,7 @@ module Gitlab
         end
       end
-      named_routes_set.url_helpers_module.include project_url_helpers
-      named_routes_set.url_helpers_module.extend project_url_helpers
-
-      Gitlab::Routing.url_helpers.include project_url_helpers
-      Gitlab::Routing.url_helpers.extend project_url_helpers
-
-      GitlabRoutingHelper.include project_url_helpers
-      GitlabRoutingHelper.extend project_url_helpers
+      Gitlab::Routing.add_helpers(project_url_helpers)
     end
   end
 end

lib/gitlab/badge/metadata.rb

@@ -4,7 +4,7 @@ module Gitlab
     # Abstract class for badge metadata
     #
     class Metadata
-      include Gitlab::Routing.url_helpers
+      include Gitlab::Routing
       include ActionView::Helpers::AssetTagHelper
       include ActionView::Helpers::UrlHelper

lib/gitlab/conflict/file.rb

 module Gitlab
   module Conflict
     class File
-      include Gitlab::Routing.url_helpers
+      include Gitlab::Routing
       include IconsHelper
       MissingResolution = Class.new(ResolutionError)

lib/gitlab/email/message/repository_push.rb

@@ -4,7 +4,7 @@ module Gitlab
       class RepositoryPush
         attr_reader :author_id, :ref, :action
-        include Gitlab::Routing.url_helpers
+        include Gitlab::Routing
         include DiffHelper
         delegate :namespace, :name_with_namespace, to: :project, prefix: :project

lib/gitlab/routing.rb

@@ -2,10 +2,30 @@ module Gitlab
   module Routing
     extend ActiveSupport::Concern
+    mattr_accessor :_includers
+    self._includers = []
+
     included do
+      Gitlab::Routing._includers << self
       include Gitlab::Routing.url_helpers
     end
+    def self.add_helpers(mod)
+      url_helpers.include mod
+      url_helpers.extend mod
+
+      app_url_helpers = Gitlab::Application.routes.named_routes.url_helpers_module
+      app_url_helpers.include mod
+      app_url_helpers.extend mod
+
+      GitlabRoutingHelper.include mod
+      GitlabRoutingHelper.extend mod
+
+      _includers.each do |klass|
+        klass.include mod
+      end
+    end
+
     # Returns the URL helpers Module.
     #
     # This method caches the output as Rails' "url_helpers" method creates an

lib/gitlab/slash_commands/presenters/base.rb

@@ -2,7 +2,7 @@ module Gitlab
   module SlashCommands
     module Presenters
       class Base
-        include Gitlab::Routing.url_helpers
+        include Gitlab::Routing
         def initialize(resource = nil)
           @resource = resource

lib/gitlab/url_builder.rb

 module Gitlab
   class UrlBuilder
-    include Gitlab::Routing.url_helpers
+    include Gitlab::Routing
     include GitlabRoutingHelper
     include ActionView::RecordIdentifier

spec/lib/extracts_path_spec.rb

@@ -3,7 +3,7 @@ require 'spec_helper'
 describe ExtractsPath, lib: true do
   include ExtractsPath
   include RepoHelpers
-  include Gitlab::Routing.url_helpers
+  include Gitlab::Routing
   let(:project) { double('project') }
   let(:request) { double('request') }

spec/models/project_services/jira_service_spec.rb

 require 'spec_helper'
 describe JiraService, models: true do
-  include Gitlab::Routing.url_helpers
+  include Gitlab::Routing
   describe "Associations" do
     it { is_expected.to belong_to :project }

spec/services/system_note_service_spec.rb

 require 'spec_helper'
 describe SystemNoteService, services: true do
-  include Gitlab::Routing.url_helpers
+  include Gitlab::Routing
   let(:project)  { create(:empty_project) }
   let(:author)   { create(:user) }

spec/spec_helper.rb

@@ -57,7 +57,7 @@ RSpec.configure do |config|
   config.include StubGitlabCalls
   config.include StubGitlabData
   config.include ApiHelpers, :api
-  config.include Gitlab::Routing.url_helpers, type: :routing
+  config.include Gitlab::Routing, type: :routing
   config.include MigrationsHelpers, :migration
   config.infer_spec_type_from_file_location!