Expose stage model attributes from pipeline object

app/models/ci/pipeline.rb

@@ -292,6 +292,16 @@ module Ci
         sort_by { |build| build[:stage_idx] }
     end
 
+    def config_stages_attributes
+      return [] unless config_processor
+
+      config_processor.stages_for_ref(ref, tag?, trigger_requests.first)
+    end
+
+    def has_stages?
+      config_stages_attributes.any?
+    end
+
     def has_warnings?
       builds.latest.failed_but_allowed.any?
     end

app/services/ci/create_pipeline_service.rb

@@ -42,8 +42,8 @@ module Ci
         return pipeline
       end
 
-      unless pipeline.config_builds_attributes.present?
-        return error('No builds for this pipeline.')
+      unless pipeline.has_stages?
+        return error('No stages / jobs for this pipeline.')
       end
 
       Ci::Pipeline.transaction do

spec/models/ci/pipeline_spec.rb

@@ -502,6 +502,20 @@ describe Ci::Pipeline, models: true do
     end
   end
 
+  describe '#has_stages?' do
+    context 'when pipeline has stages' do
+      subject { create(:ci_pipeline_with_one_job) }
+
+      it { is_expected.to have_stages }
+    end
+
+    context 'when pipeline does not have stages' do
+      subject { create(:ci_pipeline_without_jobs) }
+
+      it { is_expected.not_to have_stages }
+    end
+  end
+
   describe '#has_warnings?' do
     subject { pipeline.has_warnings? }