moved creating backlog list into list service

app/controllers/projects/boards/lists_controller.rb

@@ -5,9 +5,9 @@ module Projects
       before_action :authorize_read_list!, only: [:index]
 
       def index
-        board.lists.create(list_type: :backlog) unless board.lists.backlog.any?
+        lists = ::Boards::Lists::ListService.new(project, current_user).execute(board)
 
-        render json: serialize_as_json(board.lists)
+        render json: serialize_as_json(lists)
       end
 
       def create

app/services/boards/lists/list_service.rb

@@ -2,6 +2,8 @@ module Boards
   module Lists
     class ListService < BaseService
       def execute(board)
+        board.lists.create(list_type: :backlog) unless board.lists.backlog.any?
+
         board.lists
       end
     end

spec/services/boards/issues/list_service_spec.rb

@@ -67,7 +67,7 @@ describe Boards::Issues::ListService, services: true do
 
         issues = described_class.new(project, user, params).execute
 
-        expect(issues).to eq [closed_issue4, closed_issue2, closed_issue5, closed_issue3, closed_issue1]
+        expect(issues).to eq [closed_issue4, closed_issue2, closed_issue3, closed_issue1]
       end
 
       it 'returns opened issues that have label list applied when listing issues from a label list' do

spec/services/boards/lists/list_service_spec.rb

@@ -10,7 +10,7 @@ describe Boards::Lists::ListService, services: true do
 
       service = described_class.new(project, double)
 
-      expect(service.execute(board)).to eq [list, board.closed_list]
+      expect(service.execute(board)).to eq [board.backlog_list, list, board.closed_list]
     end
   end
 end