Merge branch 'adam-build-missing-services-when-necessary' into 'master'

Defer saving project services to the database if there are no user changes

## What does this MR do?

It defers saving project services to the database as long as it is possible. It creates a project service when creating a project only if this project service has an active template. After that project services are saved on the first edit.

## Are there points in the code the reviewer needs to double check?

- tests that used `build_missing_services` before the change
- number of queries executed

## Why was this MR needed?

Motivation in #22281

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

Fixes #22281

See merge request !6958

1 files changed, 8 insertions, 1 deletions

diff --git a/app/services/projects/create_service.rb b/app/services/projects/create_service.rb
index 15d7918e7fd..28db145a1f4 100644
--- a/app/services/projects/create_service.rb
+++ b/app/services/projects/create_service.rb
@@ -95,7 +95,7 @@ module Projects
 
       unless @project.gitlab_project_import?
         @project.create_wiki unless skip_wiki?
-        @project.build_missing_services
+        create_services_from_active_templates(@project)
 
         @project.create_labels
       end
@@ -135,5 +135,12 @@ module Projects
 
       @project
     end
+
+    def create_services_from_active_templates(project)
+      Service.where(template: true, active: true).each do |template|
+        service = Service.build_from_template(project.id, template)
+        service.save!
+      end
+    end
   end
 end