Fix multi-project pipelines after services refactoring

app/services/ci/pipeline_trigger_service.rb

@@ -37,14 +37,13 @@ module Ci
 
       pipeline = Ci::CreatePipelineService.new(project, job.user, ref: params[:ref])
         .execute(:pipeline, ignore_skip_ci: true) do |pipeline|
-          # TODO this needs a solution and specs
-
-          job.sourced_pipelines.build(
+          source = job.sourced_pipelines.build(
             source_pipeline: job.pipeline,
             source_project: job.project,
             pipeline: pipeline,
             project: project)
 
+          pipeline.source_pipeline = source
           pipeline.variables.build(variables)
         end
 

spec/requests/api/triggers_spec.rb

@@ -185,6 +185,12 @@ describe API::Triggers do
             expect(response).to have_http_status(201)
             expect(Ci::Pipeline.last.source).to eq('pipeline')
             expect(Ci::Pipeline.last.triggered_by_pipeline).not_to be_nil
+            expect(Ci::Sources::Pipeline.last).to have_attributes(
+              pipeline_id: (a_value > 0),
+              source_pipeline_id: (a_value > 0),
+              source_job_id: (a_value > 0),
+              source_project_id: (a_value > 0)
+            )
           end
 
           context 'when build is complete' do