Add a new service for creating detached CI/CD jobs

app/models/commit_status.rb

@@ -50,7 +50,9 @@ class CommitStatus < ActiveRecord::Base
   ##
   # We still create some CommitStatuses outside of CreatePipelineService.
   #
-  # These are pages deployments and external statuses.
+  # These are pages deployments and external statuses. We now handle these
+  # using CreateJobService, but we still need to ensure that a job has a
+  # stage assigned. TODO, In future releases we will add model validation.
   #
   before_create unless: :importing? do
     Ci::EnsureStageService.new(project, user).execute(self) do |stage|

app/services/ci/create_job_service.rb

+module Ci
+  class CreateJobService < BaseService
+    def execute(subject = nil)
+      (subject || yield).tap do |subject|
+        Ci::EnsureStageService.new(project, current_user)
+          .execute(subject)
+
+        subject.save!
+      end
+    end
+  end
+end

app/services/projects/update_pages_service.rb

@@ -58,6 +58,7 @@ module Projects
     end
 
     def create_status
+      Ci::CreateJobService.new(project, build.user).execute do
         GenericCommitStatus.new(
           project: project,
           pipeline: build.pipeline,
@@ -67,6 +68,7 @@ module Projects
           name: 'pages:deploy'
         )
       end
+    end
 
     def extract_archive!(temp_path)
       if artifacts.ends_with?('.tar.gz') || artifacts.ends_with?('.tgz')

lib/api/commit_statuses.rb

@@ -69,6 +69,7 @@ module API
         name = params[:name] || params[:context] || 'default'
 
         pipeline = @project.pipeline_for(ref, commit.sha)
+
         unless pipeline
           pipeline = @project.pipelines.create!(
             source: :external,
@@ -90,7 +91,14 @@ module API
         optional_attributes =
           attributes_for_keys(%w[target_url description coverage])
 
-        status.update(optional_attributes) if optional_attributes.any?
+        status.assign_attributes(optional_attributes) if optional_attributes.any?
+
+        if status.new_record?
+          Ci::CreateJobService.new(@project, current_user).execute(status)
+        else
+          status.save!
+        end
+
         render_validation_error!(status) if status.invalid?
 
         begin

spec/services/ci/create_job_service_spec.rb

+require 'spec_helper'
+
+describe Ci::CreateJobService, '#execute' do
+  set(:project) { create(:project, :repository) }
+  let(:user) { create(:admin) }
+  let(:status) { build(:ci_build) }
+  let(:service) { described_class.new(project, user) }
+
+  it 'persists job object instantiated in the block' do
+    expect(service.execute { status }).to be_persisted
+  end
+
+  it 'persists a job instance passed as an argument' do
+    expect(service.execute(status)).to be_persisted
+  end
+
+  it 'ensures that a job has a stage assigned' do
+    expect(service.execute(status).stage_id).to be_present
+  end
+end