Switch to using ProjectCiCdSetting for group_runners_enabled and remove ProjectSettings

app/controllers/projects/runners_controller.rb

@@ -53,7 +53,7 @@ class Projects::RunnersController < Projects::ApplicationController
   end
 
   def toggle_group_runners
-    project.toggle_settings!(:group_runners_enabled)
+    project.toggle_ci_cd_settings!(:group_runners_enabled)
 
     redirect_to project_settings_ci_cd_path(@project)
   end

app/models/project.rb

@@ -236,14 +236,6 @@ class Project < ActiveRecord::Base
   has_many :project_badges, class_name: 'ProjectBadge'
   has_one :ci_cd_settings, class_name: 'ProjectCiCdSetting'
 
-  has_one :settings, -> (project) {
-    query = where(project_id: project)
-    query.presence || begin
-      ProjectSettings.create(project_id: project.id)
-      query
-    end
-  }, class_name: 'ProjectSettings'
-
   accepts_nested_attributes_for :variables, allow_destroy: true
   accepts_nested_attributes_for :project_feature, update_only: true
   accepts_nested_attributes_for :import_data
@@ -253,7 +245,7 @@ class Project < ActiveRecord::Base
   delegate :members, to: :team, prefix: true
   delegate :add_user, :add_users, to: :team
   delegate :add_guest, :add_reporter, :add_developer, :add_master, :add_role, to: :team
-  delegate :group_runners_enabled, :group_runners_enabled=, :group_runners_enabled?, to: :settings
+  delegate :group_runners_enabled, :group_runners_enabled=, :group_runners_enabled?, to: :ci_cd_settings
 
   # Validations
   validates :creator, presence: true, on: :create
@@ -1879,8 +1871,8 @@ class Project < ActiveRecord::Base
     []
   end
 
-  def toggle_settings!(settings_attribute)
-    settings.toggle!(settings_attribute)
+  def toggle_ci_cd_settings!(settings_attribute)
+    ci_cd_settings.toggle!(settings_attribute)
   end
 
   def gitlab_deploy_token

app/models/project_settings.rb

-class ProjectSettings < ActiveRecord::Base
-  belongs_to :project
-end

db/migrate/20171030155459_create_project_settings.rb

-# See http://doc.gitlab.com/ce/development/migration_style_guide.html
-# for more information on how to write migrations for GitLab.
-
-class CreateProjectSettings < ActiveRecord::Migration
-  DOWNTIME = false
-
-  def change
-    create_table :project_settings do |t|
-      t.references :project, index: true, foreign_key: { on_delete: :cascade }
-
-      t.boolean :group_runners_enabled, default: true, index: true
-    end
-  end
-end

db/schema.rb

@@ -1511,14 +1511,6 @@ ActiveRecord::Schema.define(version: 20180425131009) do
 
   add_index "project_import_data", ["project_id"], name: "index_project_import_data_on_project_id", using: :btree
 
-  create_table "project_settings", force: :cascade do |t|
-    t.integer "project_id"
-    t.boolean "group_runners_enabled", default: true
-  end
-
-  add_index "project_settings", ["group_runners_enabled"], name: "index_project_settings_on_group_runners_enabled", using: :btree
-  add_index "project_settings", ["project_id"], name: "index_project_settings_on_project_id", using: :btree
-
   create_table "project_statistics", force: :cascade do |t|
     t.integer "project_id", null: false
     t.integer "namespace_id", null: false
@@ -2200,7 +2192,6 @@ ActiveRecord::Schema.define(version: 20180425131009) do
   add_foreign_key "project_features", "projects", name: "fk_18513d9b92", on_delete: :cascade
   add_foreign_key "project_group_links", "projects", name: "fk_daa8cee94c", on_delete: :cascade
   add_foreign_key "project_import_data", "projects", name: "fk_ffb9ee3a10", on_delete: :cascade
-  add_foreign_key "project_settings", "projects", on_delete: :cascade
   add_foreign_key "project_statistics", "projects", on_delete: :cascade
   add_foreign_key "protected_branch_merge_access_levels", "protected_branches", name: "fk_8a3072ccb3", on_delete: :cascade
   add_foreign_key "protected_branch_push_access_levels", "protected_branches", name: "fk_9ffc86a3d9", on_delete: :cascade

spec/models/project_spec.rb

@@ -123,26 +123,6 @@ describe Project do
         expect(subject.boards.size).to eq 1
       end
     end
-
-    describe '#settings' do
-      it 'creates lazily a settings record when the project does not have one associated' do
-        project = create :project
-        expect(ProjectSettings.count).to eq 0
-
-        expect(project.settings).to be_a ProjectSettings
-
-        expect(ProjectSettings.count).to eq 1
-      end
-
-      it 'returns the associated record when the project has one associated' do
-        project = create :project, settings: create(:project_settings)
-        expect(ProjectSettings.count).to eq 1
-
-        expect(project.settings).to be_a ProjectSettings
-
-        expect(ProjectSettings.count).to eq 1
-      end
-    end
   end
 
   describe 'modules' do
@@ -3595,13 +3575,13 @@ describe Project do
     end
   end
 
-  describe '#toggle_settings!' do
+  describe '#toggle_ci_cd_settings!' do
     it 'toggles the value on #settings' do
       project = create :project, group_runners_enabled: false
 
       expect(project.group_runners_enabled).to be false
 
-      project.toggle_settings!(:group_runners_enabled)
+      project.toggle_ci_cd_settings!(:group_runners_enabled)
 
       expect(project.group_runners_enabled).to be true
     end