Execute Gitaly LFS call once when Vue file enabled

We don't need this call since we fetch it using GraphQL

app/controllers/projects/tree_controller.rb

@@ -28,7 +28,8 @@ class Projects::TreeController < Projects::ApplicationController
 
     respond_to do |format|
       format.html do
-        lfs_blob_ids
+        lfs_blob_ids if Feature.disabled?(:vue_file_list, @project)
+
         @last_commit = @repository.last_commit_for_path(@commit.id, @tree.path) || @commit
       end
     end

app/controllers/projects_controller.rb

@@ -21,8 +21,7 @@ class ProjectsController < Projects::ApplicationController
   before_action :assign_ref_vars, if: -> { action_name == 'show' && repo_exists? }
   before_action :tree,
     if: -> { action_name == 'show' && repo_exists? && project_view_files? }
-  before_action :lfs_blob_ids,
-    if: -> { action_name == 'show' && repo_exists? && project_view_files? }
+  before_action :lfs_blob_ids, if: :show_blob_ids?, only: :show
   before_action :project_export_enabled, only: [:export, :download_export, :remove_export, :generate_new_export]
   before_action :present_project, only: [:edit]
   before_action :authorize_download_code!, only: [:refs]
@@ -296,6 +295,10 @@ class ProjectsController < Projects::ApplicationController
 
   private
 
+  def show_blob_ids?
+    repo_exists? && project_view_files? && Feature.disabled?(:vue_file_list, @project)
+  end
+
   # Render project landing depending of which features are available
   # So if page is not available in the list it renders the next page
   #

changelogs/unreleased/id-call-lfs-once-when-vue-file-list-enabled.yml

+---
+title: Execute Gitaly LFS call once when Vue file enabled
+merge_request: 22168
+author:
+type: performance

spec/controllers/projects/tree_controller_spec.rb

@@ -89,6 +89,34 @@ describe Projects::TreeController do
     end
   end
 
+  describe "GET show" do
+    context 'lfs_blob_ids instance variable' do
+      let(:id) { 'master' }
+
+      context 'with vue tree view enabled' do
+        before do
+          get(:show, params: { namespace_id: project.namespace.to_param, project_id: project, id: id })
+        end
+
+        it 'is not set' do
+          expect(assigns[:lfs_blob_ids]).to be_nil
+        end
+      end
+
+      context 'with vue tree view disabled' do
+        before do
+          stub_feature_flags(vue_file_list: false)
+
+          get(:show, params: { namespace_id: project.namespace.to_param, project_id: project, id: id })
+        end
+
+        it 'is set' do
+          expect(assigns[:lfs_blob_ids]).not_to be_nil
+        end
+      end
+    end
+  end
+
   describe 'GET show with whitespace in ref' do
     render_views
 

spec/controllers/projects_controller_spec.rb

@@ -289,6 +289,36 @@ describe ProjectsController do
           .not_to exceed_query_limit(2).for_query(expected_query)
       end
     end
+
+    context 'lfs_blob_ids instance variable' do
+      let(:project) { create(:project, :public, :repository) }
+
+      before do
+        sign_in(user)
+      end
+
+      context 'with vue tree view enabled' do
+        before do
+          get :show, params: { namespace_id: project.namespace, id: project }
+        end
+
+        it 'is not set' do
+          expect(assigns[:lfs_blob_ids]).to be_nil
+        end
+      end
+
+      context 'with vue tree view disabled' do
+        before do
+          stub_feature_flags(vue_file_list: false)
+
+          get :show, params: { namespace_id: project.namespace, id: project }
+        end
+
+        it 'is set' do
+          expect(assigns[:lfs_blob_ids]).not_to be_nil
+        end
+      end
+    end
   end
 
   describe 'GET edit' do