Avoid loading project namespace for id

In this commit we replace some namespace relationship calls
for their primary key because it already exists as a column
in the Project's table.

Changelog: performance

app/helpers/routing/pseudonymization_helper.rb

@@ -28,7 +28,7 @@ module Routing
                     when 'groups'
                       "/namespace:#{group.id}"
                     when 'projects'
-                      "/namespace:#{project.namespace.id}/project:#{project.id}"
+                      "/namespace:#{project.namespace_id}/project:#{project.id}"
                     when 'root'
                       ''
                     else
@@ -44,7 +44,7 @@ module Routing
       masked_url = "#{request.protocol}#{request.host_with_port}"
 
       if request_params.has_key?(:project_id)
-        masked_url += "/namespace:#{project.namespace.id}/project:#{project.id}/-/#{namespace_type}"
+        masked_url += "/namespace:#{project.namespace_id}/project:#{project.id}/-/#{namespace_type}"
       end
 
       if request_params.has_key?(:id)

app/services/projects/overwrite_project_service.rb

@@ -3,7 +3,7 @@
 module Projects
   class OverwriteProjectService < BaseService
     def execute(source_project)
-      return unless source_project && source_project.namespace == @project.namespace
+      return unless source_project && source_project.namespace_id == @project.namespace_id
 
       start_time = ::Gitlab::Metrics::System.monotonic_time
 
@@ -40,7 +40,7 @@ module Projects
       duration = ::Gitlab::Metrics::System.monotonic_time - start_time
 
       Gitlab::AppJsonLogger.info(class: self.class.name,
-                                 namespace_id: source_project.namespace.id,
+                                 namespace_id: source_project.namespace_id,
                                  project_id: source_project.id,
                                  duration_s: duration.to_f,
                                  error: exception.class.name)

ee/app/services/security/security_orchestration_policies/project_create_service.rb

@@ -35,7 +35,7 @@ module Security
           security_policy_target_project_id: project.id,
           name: "#{project.name} - Security policy project",
           description: "This project is automatically generated to manage security policies for the project.",
-          namespace_id: project.namespace.id,
+          namespace_id: project.namespace_id,
           initialize_with_readme: true,
           container_registry_enabled: false,
           packages_enabled: false,

lib/gitlab/issuable_sorter.rb

@@ -7,7 +7,7 @@ module Gitlab
         grouped_items = issuables.group_by do |issuable|
           if issuable.project.id == project.id
             :project_ref
-          elsif issuable.project.namespace.id == project.namespace.id
+          elsif issuable.project.namespace_id == project.namespace_id
             :namespace_ref
           else
             :full_ref

spec/helpers/routing/pseudonymization_helper_spec.rb

@@ -6,6 +6,7 @@ RSpec.describe ::Routing::PseudonymizationHelper do
   let_it_be(:group) { create(:group) }
   let_it_be(:subgroup) { create(:group, parent: group) }
   let_it_be(:project) { create(:project, group: group) }
+  let_it_be(:subproject) { create(:project, group: subgroup) }
   let_it_be(:issue) { create(:issue, project: project) }
 
   let(:merge_request) { create(:merge_request, source_project: project) }
@@ -56,16 +57,16 @@ RSpec.describe ::Routing::PseudonymizationHelper do
     end
 
     context 'with controller for groups with subgroups and project' do
-      let(:masked_url) { "http://test.host/namespace:#{subgroup.id}/project:#{project.id}"}
+      let(:masked_url) { "http://test.host/namespace:#{subgroup.id}/project:#{subproject.id}"}
 
       before do
         allow(helper).to receive(:group).and_return(subgroup)
-        allow(helper.project).to receive(:namespace).and_return(subgroup)
+        allow(helper).to receive(:project).and_return(subproject)
         allow(Rails.application.routes).to receive(:recognize_path).and_return({
           controller: 'projects',
           action: 'show',
           namespace_id: subgroup.name,
-          id: project.name
+          id: subproject.name
         })
       end