Avoid Gitaly N+1 calls by caching tag_names

app/models/repository.rb

@@ -221,6 +221,12 @@ class Repository
     branch_names.include?(branch_name)
   end
+  def tag_exists?(tag_name)
+    return false unless raw_repository
+
+    tag_names.include?(tag_name)
+  end
+
   def ref_exists?(ref)
     !!raw_repository&.ref_exists?(ref)
   rescue ArgumentError

spec/controllers/projects/pipeline_schedules_controller_spec.rb

@@ -7,6 +7,8 @@ describe Projects::PipelineSchedulesController do
   set(:pipeline_schedule) { create(:ci_pipeline_schedule, project: project) }
   describe 'GET #index' do
+    render_views
+
     let(:scope) { nil }
     let!(:inactive_pipeline_schedule) do
       create(:ci_pipeline_schedule, :inactive, project: project)

spec/models/repository_spec.rb

@@ -1157,6 +1157,15 @@ describe Repository do
     end
   end
+  describe '#tag_exists?' do
+    it 'uses tag_names' do
+      allow(repository).to receive(:tag_names).and_return(['foobar'])
+
+      expect(repository.tag_exists?('foobar')).to eq(true)
+      expect(repository.tag_exists?('master')).to eq(false)
+    end
+  end
+
   describe '#branch_names', :use_clean_rails_memory_store_caching do
     let(:fake_branch_names) { ['foobar'] }