Run CommonSystemNotesService on issuable create

Adds system notes for labels, milestone and due date on create

app/services/issuable/common_system_notes_service.rb

@@ -4,20 +4,23 @@ module Issuable
   class CommonSystemNotesService < ::BaseService
     attr_reader :issuable
-    def execute(issuable, old_labels)
+    def execute(issuable, old_labels: [], is_update: true)
       @issuable = issuable
-      if issuable.previous_changes.include?('title')
-        create_title_change_note(issuable.previous_changes['title'].first)
-      end
-      handle_description_change_note
-      handle_time_tracking_note if issuable.is_a?(TimeTrackable)
-      create_labels_note(old_labels) if issuable.labels != old_labels
-      create_discussion_lock_note if issuable.previous_changes.include?('discussion_locked')
-      create_milestone_note if issuable.previous_changes.include?('milestone_id')
+      if is_update
+        if issuable.previous_changes.include?('title')
+          create_title_change_note(issuable.previous_changes['title'].first)
+        end
+        handle_description_change_note
+
+        handle_time_tracking_note if issuable.is_a?(TimeTrackable)
+        create_discussion_lock_note if issuable.previous_changes.include?('discussion_locked')
+      end
       create_due_date_note if issuable.previous_changes.include?('due_date')
+      create_milestone_note if issuable.previous_changes.include?('milestone_id')
+      create_labels_note(old_labels) if issuable.labels != old_labels
     end
     private

app/services/issuable_base_service.rb

@@ -152,6 +152,10 @@ class IssuableBaseService < BaseService
     before_create(issuable)
     if issuable.save
+      ActiveRecord::Base.no_touching do
+        Issuable::CommonSystemNotesService.new(project, current_user).execute(issuable, is_update: false)
+      end
+
       after_create(issuable)
       execute_hooks(issuable)
       invalidate_cache_counts(issuable, users: issuable.assignees)
@@ -207,7 +211,7 @@ class IssuableBaseService < BaseService
       if issuable.with_transaction_returning_status { issuable.save }
         # We do not touch as it will affect a update on updated_at field
         ActiveRecord::Base.no_touching do
-          Issuable::CommonSystemNotesService.new(project, current_user).execute(issuable, old_associations[:labels])
+          Issuable::CommonSystemNotesService.new(project, current_user).execute(issuable, old_labels: old_associations[:labels])
         end
         handle_changes(issuable, old_associations: old_associations)

changelogs/unreleased/51485-new-issue-labels-note.yml

+---
+title: Create system notes on issue / MR creation when labels, milestone, or due date is set
+merge_request: 23859
+author:
+type: added

spec/services/issuable/common_system_notes_service_spec.rb

@@ -5,7 +5,7 @@ describe Issuable::CommonSystemNotesService do
   let(:project) { create(:project) }
   let(:issuable) { create(:issue) }
-  describe '#execute' do
+  context 'on issuable update' do
     it_behaves_like 'system note creation', { title: 'New title' }, 'changed title'
     it_behaves_like 'system note creation', { description: 'New description' }, 'changed the description'
     it_behaves_like 'system note creation', { discussion_locked: true }, 'locked this issue'
@@ -20,7 +20,7 @@ describe Issuable::CommonSystemNotesService do
       end
       it 'creates a resource label event' do
-        described_class.new(project, user).execute(issuable, [])
+        described_class.new(project, user).execute(issuable, old_labels: [])
         event = issuable.reload.resource_label_events.last
         expect(event).not_to be_nil
@@ -68,4 +68,47 @@ describe Issuable::CommonSystemNotesService do
       end
     end
   end
+
+  context 'on issuable create' do
+    let(:issuable) { build(:issue) }
+
+    subject { described_class.new(project, user).execute(issuable, old_labels: [], is_update: false) }
+
+    it 'does not create system note for title and description' do
+      issuable.save
+
+      expect { subject }.not_to change { issuable.notes.count }
+    end
+
+    it 'creates a resource label event for labels added' do
+      label = create(:label, project: project)
+
+      issuable.labels << label
+      issuable.save
+
+      expect { subject }.to change { issuable.resource_label_events.count }.from(0).to(1)
+
+      event = issuable.reload.resource_label_events.last
+
+      expect(event).not_to be_nil
+      expect(event.label_id).to eq label.id
+      expect(event.user_id).to eq user.id
+    end
+
+    it 'creates a system note for milestone set' do
+      issuable.milestone = create(:milestone, project: project)
+      issuable.save
+
+      expect { subject }.to change { issuable.notes.count }.from(0).to(1)
+      expect(issuable.notes.last.note).to match('changed milestone')
+    end
+
+    it 'creates a system note for due_date set' do
+      issuable.due_date = Date.today
+      issuable.save
+
+      expect { subject }.to change { issuable.notes.count }.from(0).to(1)
+      expect(issuable.notes.last.note).to match('changed due date')
+    end
+  end
 end

spec/support/shared_examples/common_system_notes_examples.rb

 shared_examples 'system note creation' do |update_params, note_text|
-  subject { described_class.new(project, user).execute(issuable, [])}
+  subject { described_class.new(project, user).execute(issuable, old_labels: []) }
   before do
     issuable.assign_attributes(update_params)
@@ -16,7 +16,7 @@ shared_examples 'system note creation' do |update_params, note_text|
 end
 shared_examples 'WIP notes creation' do |wip_action|
-  subject { described_class.new(project, user).execute(issuable, []) }
+  subject { described_class.new(project, user).execute(issuable, old_labels: []) }
   it 'creates WIP toggle and title change notes' do
     expect { subject }.to change { Note.count }.from(0).to(2)