Do not create pipeline objects when no builds

app/services/ci/create_builds_service.rb

@@ -20,26 +20,33 @@ module Ci
         end
       end
 
+      # don't create the same build twice
+      builds_attrs.reject! do |build_attrs|
+        @commit.builds.find_by(ref: @commit.ref, tag: @commit.tag,
+                               trigger_request: trigger_request,
+                               name: build_attrs[:name])
+      end
+
       builds_attrs.map do |build_attrs|
-        # don't create the same build twice
-        unless @commit.builds.find_by(ref: @commit.ref, tag: @commit.tag,
-                                      trigger_request: trigger_request, name: build_attrs[:name])
-          build_attrs.slice!(:name,
-                             :commands,
-                             :tag_list,
-                             :options,
-                             :allow_failure,
-                             :stage,
-                             :stage_idx)
+        build_attrs.slice!(:name,
+                           :commands,
+                           :tag_list,
+                           :options,
+                           :allow_failure,
+                           :stage,
+                           :stage_idx)
 
-          build_attrs.merge!(ref: @commit.ref,
-                             tag: @commit.tag,
-                             trigger_request: trigger_request,
-                             user: user,
-                             project: @commit.project)
+        build_attrs.merge!(ref: @commit.ref,
+                           tag: @commit.tag,
+                           trigger_request: trigger_request,
+                           user: user,
+                           project: @commit.project)
 
-          @commit.builds.create!(build_attrs)
-        end
+        ##
+        # We do not persist new builds here.
+        # Those will be persisted when @commit is saved.
+        #
+        @commit.builds.new(build_attrs)
       end
     end
   end

app/services/create_commit_builds_service.rb

@@ -25,16 +25,16 @@ class CreateCommitBuildsService
       return false
     end
 
-    # Create a new ci_commit
-    commit.save!
 
     # Skip creating builds for commits that have [ci skip]
     unless commit.skip_ci?
-      # Create builds for commit
-      commit.create_builds(user)
+      # Create builds for commit and
+      #   skip saving pipeline when there are no builds
+      return false unless commit.create_builds(user)
     end
 
-    commit.update_state!
+    # Create a new ci_commit
+    commit.save!
     commit
   end
 end

spec/services/ci/create_builds_service_spec.rb

@@ -9,7 +9,7 @@ describe Ci::CreateBuildsService, services: true do
     #
 
     subject do
-      described_class.new(commit).execute(commit, nil, user, status)
+      described_class.new(commit).execute('test', user, status, nil)
     end
 
     context 'next builds available' do
@@ -17,6 +17,10 @@ describe Ci::CreateBuildsService, services: true do
 
       it { is_expected.to be_an_instance_of Array }
       it { is_expected.to all(be_an_instance_of Ci::Build) }
+
+      it 'does not persist created builds' do
+        expect(subject.first).not_to be_persisted
+      end
     end
 
     context 'builds skipped' do