Remove flash warning from login page

app/controllers/root_controller.rb

@@ -7,6 +7,7 @@
 # For users who haven't customized the setting, we simply delegate to
 # `DashboardController#show`, which is the default.
 class RootController < Dashboard::ProjectsController
+  skip_before_action :authenticate_user!, only: [:index]
   before_action :redirect_to_custom_dashboard, only: [:index]
 
   def index
@@ -16,7 +17,7 @@ class RootController < Dashboard::ProjectsController
   private
 
   def redirect_to_custom_dashboard
-    return unless current_user
+    return redirect_to new_user_session_path unless current_user
 
     case current_user.dashboard
     when 'stars'

changelogs/unreleased/25360-remove-flash-warning-from-login-page.yml

+---
+title: Remove flash warning from login page
+merge_request: 8864
+author: Gerald J. Padilla

spec/features/login_spec.rb

@@ -25,6 +25,11 @@ feature 'Login', feature: true do
 
       expect(current_path).to eq root_path
     end
+
+    it 'does not show flash messages when login page' do
+      visit root_path
+      expect(page).not_to have_content('You need to sign in or sign up before continuing.')
+    end
   end
 
   describe 'with two-factor authentication' do