Fixes #2769 - Wrong Variable-Reference for Tags (Trigger, Scheduler).

lib/notification_factory/renderer.rb

@@ -47,6 +47,7 @@ examples how to use
     # aliases
     map = {
       'article.body' => 'article.body_as_text_with_quote.text2html',
+      'ticket.tags'  => 'ticket.tag_list',
     }
     if map[key]
       key = map[key]
@@ -176,6 +177,7 @@ examples how to use
   end
 
   def escaping(key, escape)
+    return escaping(key.join(', '), escape) if key.respond_to?(:join)
     return key if escape == false
     return key if escape.nil? && !@escape
 

spec/models/trigger_spec.rb

@@ -66,6 +66,34 @@ RSpec.describe Trigger, type: :model do
         end
       end
 
+      context 'when ticket has tags' do
+        let(:tag1) { create(:'tag/item', name: 't1') }
+        let(:tag2) { create(:'tag/item', name: 't2') }
+        let(:tag3) { create(:'tag/item', name: 't3') }
+        let!(:ticket) do
+          ticket = create(:ticket)
+          create(:tag, o: ticket, tag_item: tag1)
+          create(:tag, o: ticket, tag_item: tag2)
+          create(:tag, o: ticket, tag_item: tag3)
+          ticket
+        end
+
+        let(:perform) do
+          {
+            'notification.email' => {
+              'recipient' => 'ticket_customer',
+              'subject'   => 'foo',
+              'body'      => 'some body with #{ticket.tags}', # rubocop:disable Lint/InterpolationCheck
+            }
+          }
+        end
+
+        it 'fires body with replaced tags' do
+          Observer::Transaction.commit
+          expect(Ticket::Article.last.body).to eq('some body with t1, t2, t3')
+        end
+      end
+
       context 'when ticket is created via Channel::EmailParser.process' do
         before { create(:email_address, groups: [Group.first]) }