Redirect requests to the root path to admin root path

When the `multitenancy_management_mode` is enabled.

app/controllers/application_controller.rb

@@ -15,6 +15,7 @@ class ApplicationController < ActionController::Base
   around_action :switch_locale
   before_action :track_email_campaign
   before_action :set_return_url
+  before_action :redirect_to_admin, if: :multitenancy_management_mode?
 
   check_authorization unless: :devise_controller?
   self.responder = ApplicationResponder
@@ -117,6 +118,10 @@ def redirect_with_query_params_to(options, response_status = {})
       redirect_to path, response_status
     end
 
+    def redirect_to_admin
+      redirect_to admin_root_path if request.path == root_path
+    end
+
     def multitenancy_management_mode?
       Rails.application.config.multitenancy &&
         Tenant.default? &&

spec/system/multitenancy_management_mode_spec.rb

@@ -29,6 +29,22 @@
         expect(page).to have_css "li", count: 1
       end
     end
+
+    scenario "redirects root path requests to the admin root path" do
+      visit root_path
+
+      expect(page).to have_current_path admin_root_path
+    end
+
+    scenario "does not redirect other tenants to the admin root path", :seed_tenants do
+      create(:tenant, schema: "mars")
+
+      with_subdomain("mars") do
+        visit root_path
+
+        expect(page).to have_current_path root_path
+      end
+    end
   end
 
   context "when multitenancy_management_mode is set to false" do