Rename project.settings to project.project_setting

Singular is more appropriate and prefixing with project again makes it
more meaningful.

app/models/project.rb

@@ -190,7 +190,7 @@ class Project < ApplicationRecord
   has_one :error_tracking_setting, inverse_of: :project, class_name: 'ErrorTracking::ProjectErrorTrackingSetting'
   has_one :metrics_setting, inverse_of: :project, class_name: 'ProjectMetricsSetting'
   has_one :grafana_integration, inverse_of: :project
-  has_one :settings, ->(project) { where_or_create_by(project: project) }, inverse_of: :project, class_name: 'ProjectSettings'
+  has_one :project_setting, ->(project) { where_or_create_by(project: project) }, inverse_of: :project
 
   # Merge Requests for target project should be removed with it
   has_many :merge_requests, foreign_key: 'target_project_id', inverse_of: :target_project

app/models/project_settings.rb → app/models/project_setting.rb

 # frozen_string_literal: true
 
-class ProjectSettings < ApplicationRecord
-  belongs_to :project, inverse_of: :settings
+class ProjectSetting < ApplicationRecord
+  belongs_to :project, inverse_of: :project_setting
 
   self.primary_key = :project_id
 

app/services/projects/create_service.rb

@@ -90,7 +90,7 @@ module Projects
       end
 
       @project.track_project_repository
-      @project.create_settings
+      @project.create_project_setting unless @project.project_setting
 
       event_service.create_project(@project, current_user)
       system_hook_service.execute_hooks_for(@project, :create)

spec/lib/gitlab/import_export/all_models.yml

@@ -452,6 +452,7 @@ project:
 - package_files
 - tracing_setting
 - alerting_setting
+- project_setting
 - webide_pipelines
 - reviews
 - incident_management_setting

spec/models/project_settings_spec.rb → spec/models/project_setting_spec.rb

@@ -2,6 +2,6 @@
 
 require 'spec_helper'
 
-describe ProjectSettings, type: :model do
+describe ProjectSetting, type: :model do
   it { is_expected.to belong_to(:project) }
 end

spec/models/project_spec.rb

@@ -69,7 +69,7 @@ describe Project do
     it { is_expected.to have_one(:forked_from_project).through(:fork_network_member) }
     it { is_expected.to have_one(:auto_devops).class_name('ProjectAutoDevops') }
     it { is_expected.to have_one(:error_tracking_setting).class_name('ErrorTracking::ProjectErrorTrackingSetting') }
-    it { is_expected.to have_one(:settings).class_name('ProjectSettings') }
+    it { is_expected.to have_one(:project_setting) }
     it { is_expected.to have_many(:commit_statuses) }
     it { is_expected.to have_many(:ci_pipelines) }
     it { is_expected.to have_many(:builds) }
@@ -157,10 +157,9 @@ describe Project do
         expect(project.pages_metadatum).to be_persisted
       end
 
-      it 'creates settings if needed when accessed' do
-        expect do
-          expect(project.settings).to be_persisted
-        end.to change { ProjectSettings.count }.by(1)
+      it 'automatically creates a project setting row' do
+        expect(project.project_setting).to be_an_instance_of(ProjectSetting)
+        expect(project.project_setting).to be_persisted
       end
     end
 

spec/services/projects/create_service_spec.rb

@@ -47,7 +47,7 @@ describe Projects::CreateService, '#execute' do
     it 'creates associated project settings' do
       project = create_project(user, opts)
 
-      expect(project.settings).to be_persisted
+      expect(project.project_setting).to be_persisted
     end
   end