Change DetectRepositoryLanguagesWorker to not receive user

Fixes #60425

app/models/repository.rb

@@ -465,7 +465,7 @@ class Repository
   def after_import
     expire_content_cache
-    DetectRepositoryLanguagesWorker.perform_async(project.id, project.owner.id)
+    DetectRepositoryLanguagesWorker.perform_async(project.id)
   end
   # Runs code after a new commit has been pushed.

app/services/git/branch_push_service.rb

@@ -48,7 +48,7 @@ module Git
     def enqueue_detect_repository_languages
       return unless default_branch?
-      DetectRepositoryLanguagesWorker.perform_async(project.id, current_user.id)
+      DetectRepositoryLanguagesWorker.perform_async(project.id)
     end
     # Only stop environments if the ref is a branch that is being deleted

app/services/projects/repository_languages_service.rb

@@ -11,7 +11,7 @@ module Projects
     def perform_language_detection
       if persisted_repository_languages.blank?
-        ::DetectRepositoryLanguagesWorker.perform_async(project.id, current_user.id)
+        ::DetectRepositoryLanguagesWorker.perform_async(project.id)
       else
         project.update_column(:detected_repository_languages, true)
       end

app/workers/detect_repository_languages_worker.rb

@@ -12,13 +12,12 @@ class DetectRepositoryLanguagesWorker
   attr_reader :project
   # rubocop: disable CodeReuse/ActiveRecord
-  def perform(project_id, user_id)
+  def perform(project_id, user_id = nil)
     @project = Project.find_by(id: project_id)
-    user = User.find_by(id: user_id)
-    return unless project && user
+    return unless project
     try_obtain_lease do
-      ::Projects::DetectRepositoryLanguagesService.new(project, user).execute
+      ::Projects::DetectRepositoryLanguagesService.new(project).execute
     end
   end
   # rubocop: enable CodeReuse/ActiveRecord

changelogs/unreleased/60425-fix-500-when-accessing-charts-with-anonymous-user.yml

+---
+title: "Fix 500 error when accessing charts with an anonymous user"
+merge_request: 28091
+author: Diego Silva
+type: fixed

spec/controllers/projects/graphs_controller_spec.rb

@@ -28,6 +28,21 @@ describe Projects::GraphsController do
   end
   describe 'charts' do
+    context 'with an anonymous user' do
+      let(:project) { create(:project, :repository, :public) }
+
+      before do
+        sign_out(user)
+      end
+
+      it 'renders charts with 200 status code' do
+        get(:charts, params: { namespace_id: project.namespace.path, project_id: project.path, id: 'master' })
+
+        expect(response).to have_gitlab_http_status(:ok)
+        expect(response).to render_template(:charts)
+      end
+    end
+
     context 'when languages were previously detected' do
       let(:project) { create(:project, :repository, detected_repository_languages: true) }
       let!(:repository_language) { create(:repository_language, project: project) }

spec/services/projects/detect_repository_languages_service_spec.rb

@@ -5,7 +5,7 @@ require 'spec_helper'
 describe Projects::DetectRepositoryLanguagesService, :clean_gitlab_redis_shared_state do
   set(:project) { create(:project, :repository) }
-  subject { described_class.new(project, project.owner) }
+  subject { described_class.new(project) }
   describe '#execute' do
     context 'without previous detection' do

spec/services/projects/repository_languages_service_spec.rb

@@ -10,7 +10,7 @@ describe Projects::RepositoryLanguagesService do
     context 'when a project is without detected programming languages' do
       it 'schedules a worker and returns the empty result' do
-        expect(::DetectRepositoryLanguagesWorker).to receive(:perform_async).with(project.id, project.owner.id)
+        expect(::DetectRepositoryLanguagesWorker).to receive(:perform_async).with(project.id)
         expect(service.execute).to eq([])
       end
     end
@@ -19,7 +19,7 @@ describe Projects::RepositoryLanguagesService do
       let!(:repository_language) { create(:repository_language, project: project) }
       it 'does not schedule a worker and returns the detected languages' do
-        expect(::DetectRepositoryLanguagesWorker).not_to receive(:perform_async).with(project.id, project.owner.id)
+        expect(::DetectRepositoryLanguagesWorker).not_to receive(:perform_async).with(project.id)
         languages = service.execute

spec/workers/detect_repository_languages_worker_spec.rb

@@ -4,7 +4,6 @@ require 'spec_helper'
 describe DetectRepositoryLanguagesWorker do
   set(:project) { create(:project) }
-  let(:user) { project.owner }
   subject { described_class.new }
@@ -14,19 +13,13 @@ describe DetectRepositoryLanguagesWorker do
       allow(::Projects::DetectRepositoryLanguagesService).to receive(:new).and_return(service)
       expect(service).to receive(:execute)
-      subject.perform(project.id, user.id)
+      subject.perform(project.id)
     end
     context 'when invalid ids are used' do
       it 'does not raise when the project could not be found' do
         expect do
-          subject.perform(-1, user.id)
-        end.not_to raise_error
-      end
-
-      it 'does not raise when the user could not be found' do
-        expect do
-          subject.perform(project.id, -1)
+          subject.perform(-1)
         end.not_to raise_error
       end
     end